refactor(dashboards): move the heatmap chart to its cleaned-up location

The heatmap layer was written before the V1 cleanup moved the shared chart code
out of container/DashboardContainer/visualization into lib/visualization, so it
landed in the old tree and was the only thing left there.

- chart, utils, group-legend hook and tests move to lib/visualization/charts/Heatmap
- HeatmapChartProps joins the other chart props in charts/types.ts, alongside
  TimeSeries/Bar/Histogram/Pie; the chart-local types file held nothing else
- the heatmap tooltip, its two lists, content helpers and styles move into
  Tooltip/components/HeatmapTooltip, so the tooltip root keeps only the shell
  and the flat per-chart tooltips

Also drops a dead `timezone` prop Heatmap passed to ChartWrapper, which does not
take one — a type error the unresolvable ChartWrapper import had been masking.

Assisted-by: Claude Opus 5

.github/CODEOWNERS

@@ -152,39 +152,29 @@ go.mod @therealpandey
 
 ## Dashboard Types
 
-/frontend/src/api/types/dashboard/ @SigNoz/pulse-frontend
+/frontend/src/types/api/dashboard/ @SigNoz/pulse-frontend
+/frontend/src/types/api/widgets/ @SigNoz/pulse-frontend
 
-## Dashboard List
+## Widget Card
 
-/frontend/src/pages/DashboardsListPage/ @SigNoz/pulse-frontend
-/frontend/src/container/ListOfDashboard/ @SigNoz/pulse-frontend
-
-# Dashboard Widget Page
-
-/frontend/src/pages/DashboardWidget/ @SigNoz/pulse-frontend
-/frontend/src/container/NewWidget/ @SigNoz/pulse-frontend
-
-## Dashboard Page
-
-/frontend/src/pages/DashboardPage/ @SigNoz/pulse-frontend
-/frontend/src/container/DashboardContainer/ @SigNoz/pulse-frontend
-/frontend/src/container/GridCardLayout/ @SigNoz/pulse-frontend
+/frontend/src/container/WidgetCard/ @SigNoz/pulse-frontend
 
 ## Public Dashboard Page
 
 /frontend/src/pages/PublicDashboard/ @SigNoz/pulse-frontend
-/frontend/src/container/PublicDashboardContainer/ @SigNoz/pulse-frontend
 
 ## Dashboard Libs + Components
 
 /frontend/src/lib/uPlotV2/ @SigNoz/pulse-frontend
+/frontend/src/lib/visualization/ @SigNoz/pulse-frontend
 /frontend/src/lib/dashboard/ @SigNoz/pulse-frontend
 /frontend/src/lib/dashboardVariables/ @SigNoz/pulse-frontend
 /frontend/src/components/NewSelect/ @SigNoz/pulse-frontend
 
-## Dashboard V2
-/frontend/src/pages/DashboardPageV2/ @SigNoz/pulse-frontend
-/frontend/src/pages/DashboardsListPageV2/ @SigNoz/pulse-frontend
+## Dashboard Pages
+
+/frontend/src/pages/DashboardPage/ @SigNoz/pulse-frontend
+/frontend/src/pages/DashboardsListPage/ @SigNoz/pulse-frontend
 
 ## Infrastructure Monitoring
 /frontend/src/pages/InfrastructureMonitoring/ @SigNoz/pulse-frontend

cmd/community/server.go

@@ -44,6 +44,8 @@ import (
 	"github.com/SigNoz/signoz/pkg/ruler/signozruler"
 	"github.com/SigNoz/signoz/pkg/signoz"
 	"github.com/SigNoz/signoz/pkg/sqlstore"
+	"github.com/SigNoz/signoz/pkg/subscription"
+	"github.com/SigNoz/signoz/pkg/subscription/noopsubscription"
 	"github.com/SigNoz/signoz/pkg/telemetrystore"
 	"github.com/SigNoz/signoz/pkg/types/authtypes"
 	"github.com/SigNoz/signoz/pkg/types/dashboardtypes"
@@ -87,6 +89,9 @@ func runServer(ctx context.Context, config signoz.Config, logger *slog.Logger) e
 		func(_ sqlstore.SQLStore, _ zeus.Zeus, _ organization.Getter, _ analytics.Analytics) factory.ProviderFactory[licensing.Licensing, licensing.Config] {
 			return nooplicensing.NewFactory()
 		},
+		func(_ zeus.Zeus, _ licensing.Licensing) subscription.Subscription {
+			return noopsubscription.New()
+		},
 		signoz.NewEmailingProviderFactories(),
 		signoz.NewCacheProviderFactories(),
 		signoz.NewWebProviderFactories(config.Global),

cmd/enterprise/server.go

@@ -28,6 +28,7 @@ import (
 	eequerier "github.com/SigNoz/signoz/ee/querier"
 	enterpriseapp "github.com/SigNoz/signoz/ee/query-service/app"
 	eerules "github.com/SigNoz/signoz/ee/query-service/rules"
+	"github.com/SigNoz/signoz/ee/subscription/httpsubscription"
 	enterprisezeus "github.com/SigNoz/signoz/ee/zeus"
 	"github.com/SigNoz/signoz/ee/zeus/httpzeus"
 	"github.com/SigNoz/signoz/pkg/alertmanager"
@@ -60,6 +61,7 @@ import (
 	"github.com/SigNoz/signoz/pkg/ruler/signozruler"
 	"github.com/SigNoz/signoz/pkg/signoz"
 	"github.com/SigNoz/signoz/pkg/sqlstore"
+	"github.com/SigNoz/signoz/pkg/subscription"
 	"github.com/SigNoz/signoz/pkg/telemetrystore"
 	"github.com/SigNoz/signoz/pkg/types/authtypes"
 	"github.com/SigNoz/signoz/pkg/types/cloudintegrationtypes"
@@ -103,6 +105,9 @@ func runServer(ctx context.Context, config signoz.Config, logger *slog.Logger) e
 		func(sqlstore sqlstore.SQLStore, zeus zeus.Zeus, orgGetter organization.Getter, analytics analytics.Analytics) factory.ProviderFactory[licensing.Licensing, licensing.Config] {
 			return httplicensing.NewProviderFactory(sqlstore, zeus, orgGetter, analytics)
 		},
+		func(zeus zeus.Zeus, licensing licensing.Licensing) subscription.Subscription {
+			return httpsubscription.New(zeus, licensing)
+		},
 		signoz.NewEmailingProviderFactories(),
 		signoz.NewCacheProviderFactories(),
 		signoz.NewWebProviderFactories(config.Global),

docs/api/openapi.yml

@@ -9217,6 +9217,116 @@ components:
       required:
       - references
       type: object
+    SubscriptiontypesGettableSubscription:
+      properties:
+        redirectURL:
+          type: string
+      required:
+      - redirectURL
+      type: object
+    SubscriptiontypesGettableSubscriptionUsage:
+      properties:
+        billingPeriodEnd:
+          format: int64
+          type: integer
+        billingPeriodStart:
+          format: int64
+          type: integer
+        details:
+          $ref: '#/components/schemas/SubscriptiontypesSubscriptionUsageDetails'
+        discount:
+          format: double
+          type: number
+        subscriptionStatus:
+          type: string
+      type: object
+    SubscriptiontypesPostableSubscription:
+      properties:
+        url:
+          type: string
+      required:
+      - url
+      type: object
+    SubscriptiontypesSubscriptionUsageBreakdown:
+      properties:
+        dayWiseBreakdown:
+          $ref: '#/components/schemas/SubscriptiontypesSubscriptionUsageDayWiseBreakdown'
+        tiers:
+          items:
+            $ref: '#/components/schemas/SubscriptiontypesSubscriptionUsageTier'
+          nullable: true
+          type: array
+        type:
+          type: string
+        unit:
+          type: string
+      type: object
+    SubscriptiontypesSubscriptionUsageDayWiseBreakdown:
+      properties:
+        breakdown:
+          items:
+            $ref: '#/components/schemas/SubscriptiontypesSubscriptionUsageDayWiseData'
+          nullable: true
+          type: array
+        type:
+          type: string
+      type: object
+    SubscriptiontypesSubscriptionUsageDayWiseData:
+      properties:
+        count:
+          format: double
+          type: number
+        quantity:
+          format: double
+          type: number
+        size:
+          format: double
+          type: number
+        timestamp:
+          format: int64
+          type: integer
+        total:
+          format: double
+          type: number
+        unitPrice:
+          format: double
+          type: number
+      type: object
+    SubscriptiontypesSubscriptionUsageDetails:
+      properties:
+        baseFee:
+          format: double
+          type: number
+        billTotal:
+          format: double
+          type: number
+        breakdown:
+          items:
+            $ref: '#/components/schemas/SubscriptiontypesSubscriptionUsageBreakdown'
+          nullable: true
+          type: array
+        total:
+          format: double
+          type: number
+      type: object
+    SubscriptiontypesSubscriptionUsageTier:
+      properties:
+        quantity:
+          format: double
+          type: number
+        tierCost:
+          format: double
+          type: number
+        tierEnd:
+          format: int64
+          type: integer
+        tierStart:
+          format: int64
+          type: integer
+        unitPrice:
+          format: double
+          type: number
+      type: object
     TagtypesGettableTag:
       properties:
         key:
@@ -14441,6 +14551,197 @@ paths:
       summary: Get stats
       tags:
       - stats
+  /api/v1/subscriptions:
+    get:
+      deprecated: false
+      description: This endpoint gets the organization's subscription along with its
+        usage and billing details.
+      operationId: GetSubscription
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                properties:
+                  data:
+                    $ref: '#/components/schemas/SubscriptiontypesGettableSubscriptionUsage'
+                  status:
+                    type: string
+                required:
+                - status
+                - data
+                type: object
+          description: OK
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Bad Request
+        "401":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Unauthorized
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Forbidden
+        "404":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Not Found
+        "500":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Internal Server Error
+      security:
+      - api_key:
+        - subscription:read
+      - tokenizer:
+        - subscription:read
+      summary: Get the subscription.
+      tags:
+      - subscriptions
+    post:
+      deprecated: false
+      description: This endpoint creates a subscription for the organization.
+      operationId: CreateSubscription
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/SubscriptiontypesPostableSubscription'
+      responses:
+        "201":
+          content:
+            application/json:
+              schema:
+                properties:
+                  data:
+                    $ref: '#/components/schemas/SubscriptiontypesGettableSubscription'
+                  status:
+                    type: string
+                required:
+                - status
+                - data
+                type: object
+          description: Created
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Bad Request
+        "401":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Unauthorized
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Forbidden
+        "404":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Not Found
+        "409":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Conflict
+        "500":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Internal Server Error
+      security:
+      - api_key:
+        - subscription:create
+      - tokenizer:
+        - subscription:create
+      summary: Create a subscription.
+      tags:
+      - subscriptions
+    put:
+      deprecated: false
+      description: This endpoint updates the organization's subscription.
+      operationId: UpdateSubscription
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/SubscriptiontypesPostableSubscription'
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                properties:
+                  data:
+                    $ref: '#/components/schemas/SubscriptiontypesGettableSubscription'
+                  status:
+                    type: string
+                required:
+                - status
+                - data
+                type: object
+          description: OK
+        "400":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Bad Request
+        "401":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Unauthorized
+        "403":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Forbidden
+        "404":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Not Found
+        "500":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/RenderErrorResponse'
+          description: Internal Server Error
+      security:
+      - api_key:
+        - subscription:list
+        - subscription:update
+      - tokenizer:
+        - subscription:list
+        - subscription:update
+      summary: Update the subscription.
+      tags:
+      - subscriptions
   /api/v1/testChannel:
     post:
       deprecated: true

ee/subscription/httpsubscription/provider.go

@@ -0,0 +1,95 @@
+package httpsubscription
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"github.com/SigNoz/signoz/pkg/errors"
+	"github.com/SigNoz/signoz/pkg/licensing"
+	"github.com/SigNoz/signoz/pkg/subscription"
+	"github.com/SigNoz/signoz/pkg/types/subscriptiontypes"
+	"github.com/SigNoz/signoz/pkg/valuer"
+	"github.com/SigNoz/signoz/pkg/zeus"
+	"github.com/tidwall/gjson"
+)
+
+const upstreamTimeout = 10 * time.Second
+
+type provider struct {
+	zeus      zeus.Zeus
+	licensing licensing.Licensing
+}
+
+func New(zeus zeus.Zeus, licensing licensing.Licensing) subscription.Subscription {
+	return &provider{
+		zeus:      zeus,
+		licensing: licensing,
+	}
+}
+
+func (provider *provider) Create(ctx context.Context, organizationID valuer.UUID, postableSubscription *subscriptiontypes.PostableSubscription) (*subscriptiontypes.GettableSubscription, error) {
+	ctx, cancel := context.WithTimeout(ctx, upstreamTimeout)
+	defer cancel()
+
+	license, err := provider.licensing.GetActive(ctx, organizationID)
+	if err != nil {
+		return nil, err
+	}
+
+	body, err := json.Marshal(postableSubscription)
+	if err != nil {
+		return nil, errors.Wrapf(err, errors.TypeInvalidInput, errors.CodeInvalidInput, "failed to marshal subscription payload")
+	}
+
+	response, err := provider.zeus.GetCheckoutURL(ctx, license.Key, body)
+	if err != nil {
+		if errors.Ast(err, errors.TypeAlreadyExists) {
+			return nil, errors.WithAdditionalf(err, "checkout has already been completed for this account. Please click 'Refresh Status' to sync your subscription")
+		}
+		return nil, err
+	}
+
+	return &subscriptiontypes.GettableSubscription{RedirectURL: gjson.GetBytes(response, "url").String()}, nil
+}
+
+func (provider *provider) Update(ctx context.Context, organizationID valuer.UUID, postableSubscription *subscriptiontypes.PostableSubscription) (*subscriptiontypes.GettableSubscription, error) {
+	ctx, cancel := context.WithTimeout(ctx, upstreamTimeout)
+	defer cancel()
+
+	license, err := provider.licensing.GetActive(ctx, organizationID)
+	if err != nil {
+		return nil, err
+	}
+
+	body, err := json.Marshal(postableSubscription)
+	if err != nil {
+		return nil, errors.Wrapf(err, errors.TypeInvalidInput, errors.CodeInvalidInput, "failed to marshal subscription payload")
+	}
+
+	response, err := provider.zeus.GetPortalURL(ctx, license.Key, body)
+	if err != nil {
+		return nil, err
+	}
+
+	return &subscriptiontypes.GettableSubscription{RedirectURL: gjson.GetBytes(response, "url").String()}, nil
+}
+
+func (provider *provider) Get(ctx context.Context, organizationID valuer.UUID) (*subscriptiontypes.GettableSubscriptionUsage, error) {
+	license, err := provider.licensing.GetActive(ctx, organizationID)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := provider.zeus.GetMeters(ctx, license.Key)
+	if err != nil {
+		return nil, err
+	}
+
+	usage, err := subscriptiontypes.NewGettableSubscriptionUsage(data)
+	if err != nil {
+		return nil, errors.Wrapf(err, errors.TypeInternal, zeus.ErrCodeResponseMalformed, "failed to unmarshal subscription usage")
+	}
+
+	return usage, nil
+}

frontend/.oxlintrc.json

@@ -323,9 +323,10 @@
             "name": "react",
             "importNames": [
               "createContext",
-              "useContext"
+              "useContext",
+              "useSyncExternalStore"
             ],
-            "message": "[State mgmt] React Context is deprecated. Migrate shared state to Zustand."
+            "message": "[State mgmt] React Context and hand-rolled external stores are deprecated. Migrate shared state to Zustand."
           },
           {
             "name": "immer",

frontend/__mocks__/uplotMock.ts

@@ -2,6 +2,8 @@
 
 // Mock for uplot library used in tests
 export interface MockUPlotInstance {
+	/** Consumers read `root.parentElement` to detect a re-mounted container. */
+	root: HTMLDivElement;
 	setData: jest.Mock;
 	setSize: jest.Mock;
 	destroy: jest.Mock;
@@ -17,13 +19,20 @@ export interface MockUPlotPaths {
 }
 
 // Create mock instance methods
-const createMockUPlotInstance = (): MockUPlotInstance => ({
-	setData: jest.fn(),
-	setSize: jest.fn(),
-	destroy: jest.fn(),
-	redraw: jest.fn(),
-	setSeries: jest.fn(),
-});
+const createMockUPlotInstance = (target?: HTMLElement): MockUPlotInstance => {
+	const root = document.createElement('div');
+	// Real uPlot mounts its root inside the target; without it a re-render reads
+	// `root.parentElement` off undefined and throws.
+	target?.appendChild(root);
+	return {
+		root,
+		setData: jest.fn(),
+		setSize: jest.fn(),
+		destroy: jest.fn(),
+		redraw: jest.fn(),
+		setSeries: jest.fn(),
+	};
+};
 
 // Path builder: (self, seriesIdx, idx0, idx1) => paths or null
 const createMockPathBuilder = (name: string): jest.Mock =>
@@ -53,14 +62,16 @@ const mockTzDate = jest.fn(
 function MockUPlot(
 	_options: unknown,
 	_data: unknown,
-	_target: HTMLElement,
+	target: HTMLElement,
 ): MockUPlotInstance {
-	return createMockUPlotInstance();
+	return createMockUPlotInstance(target);
 }
 
 // Add static methods to the constructor
 MockUPlot.tzDate = mockTzDate;
 MockUPlot.paths = mockPaths;
+// Pinned so canvas-space maths in draw hooks is deterministic under jsdom.
+MockUPlot.pxRatio = 1;
 
 // Export the constructor as default
 export default MockUPlot;

frontend/src/api/generated/services/sigNoz.schemas.ts

@@ -10522,6 +10522,153 @@ export interface SpantypesUpdatableSpanMapperGroupDTO {
 	name?: string | null;
 }
 
+export interface SubscriptiontypesGettableSubscriptionDTO {
+	/**
+	 * @type string
+	 */
+	redirectURL: string;
+}
+
+export interface SubscriptiontypesSubscriptionUsageDayWiseDataDTO {
+	/**
+	 * @type number
+	 * @format double
+	 */
+	count?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	quantity?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	size?: number;
+	/**
+	 * @type integer
+	 * @format int64
+	 */
+	timestamp?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	total?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	unitPrice?: number;
+}
+
+export interface SubscriptiontypesSubscriptionUsageDayWiseBreakdownDTO {
+	/**
+	 * @type array,null
+	 */
+	breakdown?: SubscriptiontypesSubscriptionUsageDayWiseDataDTO[] | null;
+	/**
+	 * @type string
+	 */
+	type?: string;
+}
+
+export interface SubscriptiontypesSubscriptionUsageTierDTO {
+	/**
+	 * @type number
+	 * @format double
+	 */
+	quantity?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	tierCost?: number;
+	/**
+	 * @type integer
+	 * @format int64
+	 */
+	tierEnd?: number;
+	/**
+	 * @type integer
+	 * @format int64
+	 */
+	tierStart?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	unitPrice?: number;
+}
+
+export interface SubscriptiontypesSubscriptionUsageBreakdownDTO {
+	dayWiseBreakdown?: SubscriptiontypesSubscriptionUsageDayWiseBreakdownDTO;
+	/**
+	 * @type array,null
+	 */
+	tiers?: SubscriptiontypesSubscriptionUsageTierDTO[] | null;
+	/**
+	 * @type string
+	 */
+	type?: string;
+	/**
+	 * @type string
+	 */
+	unit?: string;
+}
+
+export interface SubscriptiontypesSubscriptionUsageDetailsDTO {
+	/**
+	 * @type number
+	 * @format double
+	 */
+	baseFee?: number;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	billTotal?: number;
+	/**
+	 * @type array,null
+	 */
+	breakdown?: SubscriptiontypesSubscriptionUsageBreakdownDTO[] | null;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	total?: number;
+}
+
+export interface SubscriptiontypesGettableSubscriptionUsageDTO {
+	/**
+	 * @type integer
+	 * @format int64
+	 */
+	billingPeriodEnd?: number;
+	/**
+	 * @type integer
+	 * @format int64
+	 */
+	billingPeriodStart?: number;
+	details?: SubscriptiontypesSubscriptionUsageDetailsDTO;
+	/**
+	 * @type number
+	 * @format double
+	 */
+	discount?: number;
+	/**
+	 * @type string
+	 */
+	subscriptionStatus?: string;
+}
+
+export interface SubscriptiontypesPostableSubscriptionDTO {
+	/**
+	 * @type string
+	 */
+	url: string;
+}
+
 export type TelemetrytypesGettableFieldKeysDTOKeysAnyOf = {
 	[key: string]: TelemetrytypesTelemetryFieldKeyDTO[];
 };
@@ -11740,6 +11887,30 @@ export type GetStats200 = {
 	status: string;
 };
 
+export type GetSubscription200 = {
+	data: SubscriptiontypesGettableSubscriptionUsageDTO;
+	/**
+	 * @type string
+	 */
+	status: string;
+};
+
+export type CreateSubscription201 = {
+	data: SubscriptiontypesGettableSubscriptionDTO;
+	/**
+	 * @type string
+	 */
+	status: string;
+};
+
+export type UpdateSubscription200 = {
+	data: SubscriptiontypesGettableSubscriptionDTO;
+	/**
+	 * @type string
+	 */
+	status: string;
+};
+
 export type GetTraceAggregationsPathParameters = {
 	traceID: string;
 };

frontend/src/api/generated/services/subscriptions/index.ts

@@ -0,0 +1,280 @@
+/**
+ * ! Do not edit manually
+ * * The file has been auto-generated using Orval for SigNoz
+ * * regenerate with 'pnpm generate:api'
+ * SigNoz
+ */
+import { useMutation, useQuery } from 'react-query';
+import type {
+	InvalidateOptions,
+	MutationFunction,
+	QueryClient,
+	QueryFunction,
+	QueryKey,
+	UseMutationOptions,
+	UseMutationResult,
+	UseQueryOptions,
+	UseQueryResult,
+} from 'react-query';
+
+import type {
+	CreateSubscription201,
+	GetSubscription200,
+	RenderErrorResponseDTO,
+	SubscriptiontypesPostableSubscriptionDTO,
+	UpdateSubscription200,
+} from '../sigNoz.schemas';
+
+import { GeneratedAPIInstance } from '../../../generatedAPIInstance';
+import type { ErrorType, BodyType } from '../../../generatedAPIInstance';
+
+/**
+ * This endpoint gets the organization's subscription along with its usage and billing details.
+ * @summary Get the subscription.
+ */
+export const getSubscription = (signal?: AbortSignal) => {
+	return GeneratedAPIInstance<GetSubscription200>({
+		url: `/api/v1/subscriptions`,
+		method: 'GET',
+		signal,
+	});
+};
+
+export const getGetSubscriptionQueryKey = () => {
+	return [`/api/v1/subscriptions`] as const;
+};
+
+export const getGetSubscriptionQueryOptions = <
+	TData = Awaited<ReturnType<typeof getSubscription>>,
+	TError = ErrorType<RenderErrorResponseDTO>,
+>(options?: {
+	query?: UseQueryOptions<
+		Awaited<ReturnType<typeof getSubscription>>,
+		TError,
+		TData
+	>;
+}) => {
+	const { query: queryOptions } = options ?? {};
+
+	const queryKey = queryOptions?.queryKey ?? getGetSubscriptionQueryKey();
+
+	const queryFn: QueryFunction<Awaited<ReturnType<typeof getSubscription>>> = ({
+		signal,
+	}) => getSubscription(signal);
+
+	return { queryKey, queryFn, ...queryOptions } as UseQueryOptions<
+		Awaited<ReturnType<typeof getSubscription>>,
+		TError,
+		TData
+	> & { queryKey: QueryKey };
+};
+
+export type GetSubscriptionQueryResult = NonNullable<
+	Awaited<ReturnType<typeof getSubscription>>
+>;
+export type GetSubscriptionQueryError = ErrorType<RenderErrorResponseDTO>;
+
+/**
+ * @summary Get the subscription.
+ */
+
+export function useGetSubscription<
+	TData = Awaited<ReturnType<typeof getSubscription>>,
+	TError = ErrorType<RenderErrorResponseDTO>,
+>(options?: {
+	query?: UseQueryOptions<
+		Awaited<ReturnType<typeof getSubscription>>,
+		TError,
+		TData
+	>;
+}): UseQueryResult<TData, TError> & { queryKey: QueryKey } {
+	const queryOptions = getGetSubscriptionQueryOptions(options);
+
+	const query = useQuery(queryOptions) as UseQueryResult<TData, TError> & {
+		queryKey: QueryKey;
+	};
+
+	return { ...query, queryKey: queryOptions.queryKey };
+}
+
+/**
+ * @summary Get the subscription.
+ */
+export const invalidateGetSubscription = async (
+	queryClient: QueryClient,
+	options?: InvalidateOptions,
+): Promise<QueryClient> => {
+	await queryClient.invalidateQueries(
+		{ queryKey: getGetSubscriptionQueryKey() },
+		options,
+	);
+
+	return queryClient;
+};
+
+/**
+ * This endpoint creates a subscription for the organization.
+ * @summary Create a subscription.
+ */
+export const createSubscription = (
+	subscriptiontypesPostableSubscriptionDTO?: BodyType<SubscriptiontypesPostableSubscriptionDTO>,
+	signal?: AbortSignal,
+) => {
+	return GeneratedAPIInstance<CreateSubscription201>({
+		url: `/api/v1/subscriptions`,
+		method: 'POST',
+		headers: { 'Content-Type': 'application/json' },
+		data: subscriptiontypesPostableSubscriptionDTO,
+		signal,
+	});
+};
+
+export const getCreateSubscriptionMutationOptions = <
+	TError = ErrorType<RenderErrorResponseDTO>,
+	TContext = unknown,
+>(options?: {
+	mutation?: UseMutationOptions<
+		Awaited<ReturnType<typeof createSubscription>>,
+		TError,
+		{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+		TContext
+	>;
+}): UseMutationOptions<
+	Awaited<ReturnType<typeof createSubscription>>,
+	TError,
+	{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+	TContext
+> => {
+	const mutationKey = ['createSubscription'];
+	const { mutation: mutationOptions } = options
+		? options.mutation &&
+			'mutationKey' in options.mutation &&
+			options.mutation.mutationKey
+			? options
+			: { ...options, mutation: { ...options.mutation, mutationKey } }
+		: { mutation: { mutationKey } };
+
+	const mutationFn: MutationFunction<
+		Awaited<ReturnType<typeof createSubscription>>,
+		{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> }
+	> = (props) => {
+		const { data } = props ?? {};
+
+		return createSubscription(data);
+	};
+
+	return { mutationFn, ...mutationOptions };
+};
+
+export type CreateSubscriptionMutationResult = NonNullable<
+	Awaited<ReturnType<typeof createSubscription>>
+>;
+export type CreateSubscriptionMutationBody =
+	| BodyType<SubscriptiontypesPostableSubscriptionDTO>
+	| undefined;
+export type CreateSubscriptionMutationError = ErrorType<RenderErrorResponseDTO>;
+
+/**
+ * @summary Create a subscription.
+ */
+export const useCreateSubscription = <
+	TError = ErrorType<RenderErrorResponseDTO>,
+	TContext = unknown,
+>(options?: {
+	mutation?: UseMutationOptions<
+		Awaited<ReturnType<typeof createSubscription>>,
+		TError,
+		{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+		TContext
+	>;
+}): UseMutationResult<
+	Awaited<ReturnType<typeof createSubscription>>,
+	TError,
+	{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+	TContext
+> => {
+	return useMutation(getCreateSubscriptionMutationOptions(options));
+};
+/**
+ * This endpoint updates the organization's subscription.
+ * @summary Update the subscription.
+ */
+export const updateSubscription = (
+	subscriptiontypesPostableSubscriptionDTO?: BodyType<SubscriptiontypesPostableSubscriptionDTO>,
+	signal?: AbortSignal,
+) => {
+	return GeneratedAPIInstance<UpdateSubscription200>({
+		url: `/api/v1/subscriptions`,
+		method: 'PUT',
+		headers: { 'Content-Type': 'application/json' },
+		data: subscriptiontypesPostableSubscriptionDTO,
+		signal,
+	});
+};
+
+export const getUpdateSubscriptionMutationOptions = <
+	TError = ErrorType<RenderErrorResponseDTO>,
+	TContext = unknown,
+>(options?: {
+	mutation?: UseMutationOptions<
+		Awaited<ReturnType<typeof updateSubscription>>,
+		TError,
+		{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+		TContext
+	>;
+}): UseMutationOptions<
+	Awaited<ReturnType<typeof updateSubscription>>,
+	TError,
+	{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+	TContext
+> => {
+	const mutationKey = ['updateSubscription'];
+	const { mutation: mutationOptions } = options
+		? options.mutation &&
+			'mutationKey' in options.mutation &&
+			options.mutation.mutationKey
+			? options
+			: { ...options, mutation: { ...options.mutation, mutationKey } }
+		: { mutation: { mutationKey } };
+
+	const mutationFn: MutationFunction<
+		Awaited<ReturnType<typeof updateSubscription>>,
+		{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> }
+	> = (props) => {
+		const { data } = props ?? {};
+
+		return updateSubscription(data);
+	};
+
+	return { mutationFn, ...mutationOptions };
+};
+
+export type UpdateSubscriptionMutationResult = NonNullable<
+	Awaited<ReturnType<typeof updateSubscription>>
+>;
+export type UpdateSubscriptionMutationBody =
+	| BodyType<SubscriptiontypesPostableSubscriptionDTO>
+	| undefined;
+export type UpdateSubscriptionMutationError = ErrorType<RenderErrorResponseDTO>;
+
+/**
+ * @summary Update the subscription.
+ */
+export const useUpdateSubscription = <
+	TError = ErrorType<RenderErrorResponseDTO>,
+	TContext = unknown,
+>(options?: {
+	mutation?: UseMutationOptions<
+		Awaited<ReturnType<typeof updateSubscription>>,
+		TError,
+		{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+		TContext
+	>;
+}): UseMutationResult<
+	Awaited<ReturnType<typeof updateSubscription>>,
+	TError,
+	{ data?: BodyType<SubscriptiontypesPostableSubscriptionDTO> },
+	TContext
+> => {
+	return useMutation(getUpdateSubscriptionMutationOptions(options));
+};

frontend/src/api/v5/queryRange/prepareQueryRangePayloadV5.ts

@@ -6,6 +6,7 @@ import { GetQueryResultsProps } from 'lib/dashboard/getQueryResults';
 import getStartEndRangeTime from 'lib/getStartEndRangeTime';
 import { mapQueryDataToApi } from 'lib/newQueryBuilder/queryBuilderMappers/mapQueryDataToApi';
 import { isEmpty } from 'lodash-es';
+import { DynamicVariableSuggestion } from 'providers/Dashboard/store/dynamicVariableSuggestions';
 import { BaseAutocompleteData } from 'types/api/queryBuilder/queryAutocompleteResponse';
 import {
 	IBuilderQuery,
@@ -545,20 +546,22 @@ function reduceQueriesToObject(queryArray: any[]): {
 /**
  * Prepares V5 query range payload from GetQueryResultsProps
  */
-export const prepareQueryRangePayloadV5 = ({
-	query,
-	globalSelectedInterval,
-	graphType,
-	selectedTime,
-	tableParams,
-	variables = {},
-	start: startTime,
-	end: endTime,
-	formatForWeb,
-	originalGraphType,
-	fillGaps,
-	dynamicVariables,
-}: GetQueryResultsProps): PrepareQueryRangePayloadV5Result => {
+export const prepareQueryRangePayloadV5 = (
+	{
+		query,
+		globalSelectedInterval,
+		graphType,
+		selectedTime,
+		tableParams,
+		variables = {},
+		start: startTime,
+		end: endTime,
+		formatForWeb,
+		originalGraphType,
+		fillGaps,
+	}: GetQueryResultsProps,
+	dynamicVariables: DynamicVariableSuggestion[] = [],
+): PrepareQueryRangePayloadV5Result => {
 	let legendMap: Record<string, string> = {};
 	const requestType = mapPanelTypeToRequestType(graphType);
 	let queries: QueryEnvelope[] = [];
@@ -671,9 +674,9 @@ export const prepareQueryRangePayloadV5 = ({
 			(acc, [key, value]) => {
 				acc[key] = {
 					value,
-					type: dynamicVariables
-						?.find((v) => v.name === key)
-						?.type?.toLowerCase() as VariableType,
+					type: dynamicVariables.some((v) => v.name === key)
+						? ('dynamic' as VariableType)
+						: undefined,
 				};
 				return acc;
 			},

frontend/src/components/QueryBuilderV2/QueryV2/QuerySearch/QuerySearch.tsx

@@ -27,7 +27,7 @@ import {
 	QUERY_BUILDER_OPERATORS_BY_KEY_TYPE,
 	queryOperatorSuggestions,
 } from 'constants/antlrQueryConstants';
-import { useDashboardVariablesByType } from 'hooks/dashboard/useDashboardVariablesByType';
+import { useDynamicVariableSuggestions } from 'hooks/dashboard/useDynamicVariableSuggestions';
 import { useIsDarkMode } from 'hooks/useDarkMode';
 import useDebounce from 'hooks/useDebounce';
 import { debounce, isNull } from 'lodash-es';
@@ -258,10 +258,7 @@ function QuerySearch({
 	const lastValueRef = useRef<string>('');
 	const isMountedRef = useRef<boolean>(true);
 
-	const dashboardDynamicVariables = useDashboardVariablesByType(
-		'DYNAMIC',
-		'values',
-	);
+	const dashboardDynamicVariables = useDynamicVariableSuggestions();
 
 	// Add back the generateOptions function and useEffect
 	const generateOptions = (keys: {
@@ -1188,8 +1185,8 @@ function QuerySearch({
 			);
 
 			// Add dynamic variables suggestions for the current key
-			const variableName = dashboardDynamicVariables?.find(
-				(variable) => variable?.dynamicVariablesAttribute === keyName,
+			const variableName = dashboardDynamicVariables.find(
+				(variable) => variable.attribute === keyName,
 			)?.name;
 
 			if (variableName) {

frontend/src/components/QueryBuilderV2/utils.ts

@@ -525,6 +525,34 @@ export const convertFiltersToExpressionWithExistingQuery = (
 	};
 };
 
+/**
+ * Canonical name for a comparison's operator, limited to the equality and
+ * membership forms. Every other shape (LIKE, BETWEEN, EXISTS, CONTAINS, REGEXP,
+ * the ordering operators) returns undefined, so an operator-restricted removal
+ * leaves it in place.
+ *
+ * The ANTLR4 runtime returns null for an absent token or rule despite the
+ * non-nullable TypeScript signatures.
+ */
+const getComparisonOperator = (ctx: ComparisonContext): string | undefined => {
+	if ((ctx.inClause() as unknown) !== null) {
+		return 'in';
+	}
+	if ((ctx.notInClause() as unknown) !== null) {
+		return 'not in';
+	}
+	if ((ctx.EQUALS() as unknown) !== null) {
+		return '=';
+	}
+	if (
+		(ctx.NOT_EQUALS() as unknown) !== null ||
+		(ctx.NEQ() as unknown) !== null
+	) {
+		return '!=';
+	}
+	return undefined;
+};
+
 /**
  * Removes clauses for specified keys from a filter query expression.
  *
@@ -542,12 +570,16 @@ export const convertFiltersToExpressionWithExistingQuery = (
  *   - `true`: removes only the first clause whose value contains any `$`.
  *   - `string` (e.g. `"$service.name"`): removes only the clause whose value exactly
  *     matches that string — preferred when the specific variable reference is known.
+ * @param operatorsToRemove - When given, restricts removal to clauses whose operator
+ *   is in this set (`=`, `!=`, `in`, `not in`); every other clause on the key is kept.
+ *   Omit to remove a matching key's clauses whatever their operator.
  * @returns The rewritten expression, or an empty string if all clauses were removed.
  */
 export const removeKeysFromExpression = (
 	expression: string,
 	keysToRemove: string[],
 	removeOnlyVariableExpressions: string | boolean = false,
+	operatorsToRemove?: string[],
 ): string => {
 	if (!keysToRemove || keysToRemove.length === 0) {
 		return expression;
@@ -557,6 +589,9 @@ export const removeKeysFromExpression = (
 	}
 
 	const keysSet = new Set(keysToRemove.map((k) => k.trim().toLowerCase()));
+	const operatorsSet = operatorsToRemove
+		? new Set(operatorsToRemove.map((op) => op.trim().toLowerCase()))
+		: null;
 	// Tracks keys for which a variable expression has already been removed.
 	// Having multiple $-value clauses for the same key is invalid; we remove at most one.
 	const removedVariableKeys = new Set<string>();
@@ -658,6 +693,13 @@ export const removeKeysFromExpression = (
 			return src(ctx);
 		}
 
+		if (operatorsSet) {
+			const operator = getComparisonOperator(ctx);
+			if (!operator || !operatorsSet.has(operator)) {
+				return src(ctx);
+			}
+		}
+
 		if (removeOnlyVariableExpressions) {
 			// Scope the value check to value nodes only — not the full comparison text —
 			// so a key that contains '$' does not trigger removal when the value is a

frontend/src/components/QuickFilters/FilterRenderers/Checkbox/checkboxFilterQuery.test.ts

@@ -0,0 +1,526 @@
+import {
+	convertFiltersToExpression,
+	convertFiltersToExpressionWithExistingQuery,
+} from 'components/QueryBuilderV2/utils';
+import { QuickFiltersSource } from 'components/QuickFilters/types';
+import {
+	Query,
+	TagFilter,
+	TagFilterItem,
+} from 'types/api/queryBuilder/queryBuilderData';
+
+import {
+	applyCheckboxToggle,
+	clearFilterFromQuery,
+	deriveCheckboxState,
+	getNotInOperator,
+} from './checkboxFilterQuery';
+import { CheckedState } from '../../types';
+import { SectionType } from './v2/itemRules';
+
+const KEY = 'service.name';
+
+/**
+ * Mini test framework
+ * -------------------
+ * `filters.items` is the source of truth the checkbox algebra mutates.
+ * `filter.expression` is the derived value the backend actually reads, and it is
+ * authoritatively rebuilt from the items on every URL round trip
+ * (`useGetCompositeQueryParam` -> `convertFiltersToExpressionWithExistingQuery`).
+ * That rebuild is additive, so `applyCheckboxToggle` re-derives its own clauses
+ * into the expression itself: otherwise the round trip resurrects a clause the
+ * toggle removed, or appends a duplicate of one it replaced.
+ *
+ * So a case does not assert the intermediate expression the toggle emits. It
+ * asserts the pair that has to stay consistent:
+ *   - `items`      : exact structured clauses after the toggle
+ *   - `expression` : the expression AFTER the round trip, which is what ships
+ *
+ * `runToggle` runs the real reducer, then feeds its output through the real
+ * converter to get the shipped expression.
+ */
+
+type SimpleItem = {
+	key: string;
+	op: string;
+	value: TagFilterItem['value'];
+};
+
+function toTagItem(item: SimpleItem, idx: number): TagFilterItem {
+	return {
+		id: `id-${idx}`,
+		key: { key: item.key, type: 'tag' } as TagFilterItem['key'],
+		op: item.op,
+		value: item.value,
+	};
+}
+
+// Serialises items into an expression (via the app's own converter) so a case's
+// starting state is self-consistent (items and expression agree), the way it
+// would be in the app after a prior round trip.
+const serializeItems = (items: SimpleItem[]): string =>
+	convertFiltersToExpression({ items: items.map(toTagItem), op: 'AND' })
+		.expression;
+
+function buildQuery(items: SimpleItem[], expression: string): Query {
+	return {
+		builder: {
+			queryData: [
+				{
+					filters: { items: items.map(toTagItem), op: 'AND' },
+					filter: { expression },
+				},
+			],
+		},
+	} as unknown as Query;
+}
+
+// Simulates the URL round trip: rebuild the shipped expression from the items,
+// reconciled against whatever expression the toggle left behind. Trimmed to
+// absorb a converter quirk that leaves a trailing space when it widens an
+// operator in place (e.g. `=` -> `IN`).
+function roundTripExpression(
+	items: TagFilterItem[],
+	emittedExpression: string,
+): string {
+	const filters: TagFilter = { items, op: 'AND' };
+	const { filter } = convertFiltersToExpressionWithExistingQuery(
+		filters,
+		emittedExpression,
+	);
+	return (filter?.expression ?? '').trim();
+}
+
+interface ToggleAction {
+	value: string;
+	checked: boolean;
+	isOnlyOrAllClicked?: boolean;
+	previousState?: CheckedState;
+	sectionType?: SectionType;
+	source?: QuickFiltersSource;
+	attributeValues?: string[];
+}
+
+interface ToggleCase {
+	name: string;
+	initial?: { items?: SimpleItem[]; expression?: string };
+	action: ToggleAction;
+	expected: { items: SimpleItem[]; expression: string };
+}
+
+function runToggle(c: ToggleCase): { items: SimpleItem[]; expression: string } {
+	const initialItems = c.initial?.items ?? [];
+	const initialExpression =
+		c.initial?.expression ?? serializeItems(initialItems);
+
+	const result = applyCheckboxToggle({
+		currentQuery: buildQuery(initialItems, initialExpression),
+		activeQueryIndex: 0,
+		filter: { attributeKey: { key: KEY, type: 'tag' } } as never,
+		source: c.action.source ?? QuickFiltersSource.LOGS_EXPLORER,
+		attributeValues: c.action.attributeValues ?? ['a', 'b', 'c'],
+		value: c.action.value,
+		checked: c.action.checked,
+		isOnlyOrAllClicked: c.action.isOnlyOrAllClicked ?? false,
+		previousState: c.action.previousState,
+		sectionType: c.action.sectionType,
+	});
+
+	const active = result.builder.queryData[0];
+	const items = active?.filters?.items ?? [];
+	return {
+		items: items.map((item) => ({
+			key: item.key?.key ?? '',
+			op: item.op,
+			value: item.value,
+		})),
+		expression: roundTripExpression(items, active?.filter?.expression ?? ''),
+	};
+}
+
+// Flat list. Every row asserts both the structured items and the shipped
+// (round-tripped) expression, which must stay in sync.
+const TOGGLE_CASES: ToggleCase[] = [
+	{
+		name: 'no clause, checked -> IN',
+		action: { value: 'a', checked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: 'a' }],
+			expression: `service.name in ['a']`,
+		},
+	},
+	{
+		name: 'no clause, unchecked -> NOT IN',
+		action: { value: 'a', checked: false },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: 'a' }],
+			expression: `service.name not in ['a']`,
+		},
+	},
+	{
+		name: 'no clause, unchecked on infra -> not in',
+		action: {
+			value: 'a',
+			checked: false,
+			source: QuickFiltersSource.INFRA_MONITORING,
+		},
+		// `nin` is what the source asks for, but re-deriving the expression
+		// normalises it. Nothing observes the difference: both infra pages send
+		// `filter.expression` and never `filters.items`.
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: 'a' }],
+			expression: `service.name not in ['a']`,
+		},
+	},
+	{
+		name: 'IN, check another value -> appended',
+		initial: { items: [{ key: KEY, op: 'in', value: ['a'] }] },
+		action: { value: 'b', checked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: ['a', 'b'] }],
+			expression: `service.name in ['a', 'b']`,
+		},
+	},
+	{
+		name: 'IN, check when value is scalar -> promoted to array',
+		initial: { items: [{ key: KEY, op: 'in', value: 'a' }] },
+		action: { value: 'b', checked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: ['a', 'b'] }],
+			expression: `service.name in ['a', 'b']`,
+		},
+	},
+	{
+		name: 'IN, uncheck one of many -> filtered out',
+		initial: { items: [{ key: KEY, op: 'in', value: ['a', 'b'] }] },
+		action: { value: 'a', checked: false },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: ['b'] }],
+			expression: `service.name in ['b']`,
+		},
+	},
+	{
+		name: 'IN, uncheck last value in array -> clause gone',
+		initial: { items: [{ key: KEY, op: 'in', value: ['a'] }] },
+		action: { value: 'a', checked: false },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'IN, uncheck scalar value -> clause gone',
+		initial: { items: [{ key: KEY, op: 'in', value: 'a' }] },
+		action: { value: 'a', checked: false },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'IN, uncheck in RELATED section -> replaced by NOT IN for that value',
+		initial: { items: [{ key: KEY, op: 'in', value: ['a', 'b'] }] },
+		action: { value: 'a', checked: false, sectionType: SectionType.RELATED },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: 'a' }],
+			expression: `service.name not in ['a']`,
+		},
+	},
+	{
+		name: 'NOT IN, was unchecked then checked -> replaced by IN for that value',
+		initial: { items: [{ key: KEY, op: 'not in', value: ['a'] }] },
+		action: { value: 'b', checked: true, previousState: 'unchecked' },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: 'b' }],
+			expression: `service.name in ['b']`,
+		},
+	},
+	{
+		name: 'NOT IN, re-checking an excluded value clears it, not flips it to IN',
+		initial: { items: [{ key: KEY, op: 'not in', value: ['a'] }] },
+		action: { value: 'a', checked: true, previousState: 'unchecked' },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'NOT IN, re-checking one of several excluded values keeps the rest',
+		initial: { items: [{ key: KEY, op: 'not in', value: ['a', 'b'] }] },
+		action: { value: 'a', checked: true, previousState: 'unchecked' },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: ['b'] }],
+			expression: `service.name not in ['b']`,
+		},
+	},
+	{
+		name: 'NOT IN, exclude another value -> appended',
+		initial: { items: [{ key: KEY, op: 'not in', value: ['a'] }] },
+		action: { value: 'b', checked: false },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: ['a', 'b'] }],
+			expression: `service.name not in ['a', 'b']`,
+		},
+	},
+	{
+		name: 'NOT IN, exclude when scalar -> promoted to array',
+		initial: { items: [{ key: KEY, op: 'not in', value: 'a' }] },
+		action: { value: 'b', checked: false },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: ['a', 'b'] }],
+			expression: `service.name not in ['a', 'b']`,
+		},
+	},
+	{
+		name: 'NOT IN, check an excluded value -> removed from array',
+		initial: { items: [{ key: KEY, op: 'not in', value: ['a', 'b'] }] },
+		action: { value: 'a', checked: true },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: ['b'] }],
+			expression: `service.name not in ['b']`,
+		},
+	},
+	{
+		name: 'NOT IN, check last excluded value in array -> clause gone',
+		initial: { items: [{ key: KEY, op: 'not in', value: ['a'] }] },
+		action: { value: 'a', checked: true },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'NOT IN, check excluded scalar value -> clause gone',
+		initial: { items: [{ key: KEY, op: 'not in', value: 'a' }] },
+		action: { value: 'a', checked: true },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: '= check another value -> promoted to IN array',
+		initial: { items: [{ key: KEY, op: '=', value: 'a' }] },
+		action: { value: 'b', checked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: ['a', 'b'] }],
+			expression: `service.name in ['a', 'b']`,
+		},
+	},
+	{
+		name: '= uncheck -> clause gone',
+		initial: { items: [{ key: KEY, op: '=', value: 'a' }] },
+		action: { value: 'a', checked: false },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: '!= exclude another value -> promoted to NOT IN array',
+		initial: { items: [{ key: KEY, op: '!=', value: 'a' }] },
+		action: { value: 'b', checked: false },
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: ['a', 'b'] }],
+			expression: `service.name not in ['a', 'b']`,
+		},
+	},
+	{
+		name: '!= exclude another value on infra -> not in array',
+		initial: { items: [{ key: KEY, op: '!=', value: 'a' }] },
+		action: {
+			value: 'b',
+			checked: false,
+			source: QuickFiltersSource.INFRA_MONITORING,
+		},
+		expected: {
+			items: [{ key: KEY, op: 'not in', value: ['a', 'b'] }],
+			expression: `service.name not in ['a', 'b']`,
+		},
+	},
+	{
+		name: '!= check -> clause gone',
+		initial: { items: [{ key: KEY, op: '!=', value: 'a' }] },
+		action: { value: 'a', checked: true },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'Only with no clause -> IN scalar',
+		action: { value: 'a', checked: true, isOnlyOrAllClicked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: 'a' }],
+			expression: `service.name in ['a']`,
+		},
+	},
+	{
+		name: 'Only replaces a multi-value IN with a single value',
+		initial: { items: [{ key: KEY, op: 'in', value: ['a', 'b'] }] },
+		action: { value: 'a', checked: true, isOnlyOrAllClicked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: 'a' }],
+			expression: `service.name in ['a']`,
+		},
+	},
+	{
+		name: 'All (clicking the sole selected value) -> clause gone',
+		initial: { items: [{ key: KEY, op: 'in', value: ['a'] }] },
+		action: { value: 'a', checked: true, isOnlyOrAllClicked: true },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'dropping the last clause keeps other keys in the expression',
+		initial: {
+			items: [{ key: KEY, op: 'in', value: 'a' }],
+			expression: `${KEY} = 'a' AND http.method = 'GET'`,
+		},
+		action: { value: 'a', checked: false },
+		// The seeded items omit the http.method clause the expression carries;
+		// re-deriving reconciles it back, which is why items is not empty here.
+		expected: {
+			items: [{ key: 'http.method', op: '=', value: 'GET' }],
+			expression: `http.method = 'GET'`,
+		},
+	},
+	{
+		name: 'dropping the last clause strips the prefixed spelling too',
+		initial: {
+			items: [{ key: 'resource.service.name', op: 'in', value: 'a' }],
+			expression: `resource.service.name = 'a'`,
+		},
+		action: { value: 'a', checked: false },
+		expected: { items: [], expression: '' },
+	},
+	{
+		name: 'removing the value must keep a free-form clause on the same key',
+		initial: {
+			items: [{ key: KEY, op: '=', value: 'a' }],
+			expression: `${KEY} = 'a' AND ${KEY} CONTAINS 'keepme'`,
+		},
+		action: { value: 'a', checked: false },
+		expected: {
+			items: [{ key: KEY, op: 'contains', value: 'keepme' }],
+			expression: `service.name CONTAINS 'keepme'`,
+		},
+	},
+	{
+		name: 'a second clause on the same key must not survive an add',
+		initial: {
+			items: [{ key: KEY, op: 'in', value: ['a'] }],
+			expression: `${KEY} IN ['a'] AND ${KEY} != 'z'`,
+		},
+		action: { value: 'b', checked: true },
+		expected: {
+			items: [{ key: KEY, op: 'in', value: ['a', 'b'] }],
+			expression: `service.name in ['a', 'b']`,
+		},
+	},
+];
+
+describe('applyCheckboxToggle (items + shipped expression stay in sync)', () => {
+	it.each(TOGGLE_CASES)('$name', (c) => {
+		const got = runToggle(c);
+		expect(got.items).toStrictEqual(c.expected.items);
+		expect(got.expression).toBe(c.expected.expression);
+	});
+});
+
+describe('getNotInOperator', () => {
+	it('returns short "nin" for infra monitoring', () => {
+		expect(getNotInOperator(QuickFiltersSource.INFRA_MONITORING)).toBe('nin');
+	});
+
+	it('returns long "not in" for other sources', () => {
+		expect(getNotInOperator(QuickFiltersSource.LOGS_EXPLORER)).toBe('not in');
+		expect(getNotInOperator(QuickFiltersSource.TRACES_EXPLORER)).toBe('not in');
+	});
+});
+
+describe('deriveCheckboxState', () => {
+	const attributeValues = ['a', 'b', 'c'];
+
+	const state = (items: TagFilterItem[] | undefined): Record<string, boolean> =>
+		deriveCheckboxState({ attributeValues, filterItems: items, filterKey: KEY });
+
+	it('no clause for key -> everything checked', () => {
+		expect(state([])).toStrictEqual({ a: true, b: true, c: true });
+		expect(state(undefined)).toStrictEqual({ a: true, b: true, c: true });
+	});
+
+	it('unrelated clause only -> everything checked', () => {
+		expect(
+			state([toTagItem({ key: 'other', op: 'in', value: ['a'] }, 0)]),
+		).toStrictEqual({ a: true, b: true, c: true });
+	});
+
+	it('IN [list] -> only listed values checked', () => {
+		expect(
+			state([toTagItem({ key: KEY, op: 'in', value: ['a', 'c'] }, 0)]),
+		).toStrictEqual({ a: true, b: false, c: true });
+	});
+
+	it('= "value" -> only that value checked', () => {
+		expect(
+			state([toTagItem({ key: KEY, op: '=', value: 'b' }, 0)]),
+		).toStrictEqual({ a: false, b: true, c: false });
+	});
+
+	it('NOT IN [list] -> everything except excluded checked', () => {
+		expect(
+			state([toTagItem({ key: KEY, op: 'not in', value: ['a'] }, 0)]),
+		).toStrictEqual({ a: false, b: true, c: true });
+	});
+
+	it('!= "value" -> everything except that value checked', () => {
+		expect(
+			state([toTagItem({ key: KEY, op: '!=', value: 'b' }, 0)]),
+		).toStrictEqual({ a: true, b: false, c: true });
+	});
+
+	it('matches by base key across context prefixes', () => {
+		expect(
+			state([
+				toTagItem({ key: 'resource.service.name', op: 'in', value: ['a'] }, 0),
+			]),
+		).toStrictEqual({ a: true, b: false, c: false });
+	});
+
+	it('coerces boolean / number values to string keys', () => {
+		expect(
+			deriveCheckboxState({
+				attributeValues: ['true', '42'],
+				filterItems: [toTagItem({ key: KEY, op: '=', value: true }, 0)],
+				filterKey: KEY,
+			}),
+		).toStrictEqual({ true: true, '42': false });
+	});
+});
+
+describe('clearFilterFromQuery', () => {
+	it('removes the key from items and expression at the active index only', () => {
+		const query = {
+			builder: {
+				queryData: [
+					{
+						filters: {
+							items: [
+								toTagItem({ key: KEY, op: 'in', value: ['a'] }, 0),
+								toTagItem({ key: 'http.method', op: '=', value: 'GET' }, 1),
+							],
+							op: 'AND',
+						},
+						filter: { expression: `${KEY} = 'a' AND http.method = 'GET'` },
+					},
+					{
+						filters: {
+							items: [toTagItem({ key: KEY, op: 'in', value: ['a'] }, 2)],
+							op: 'AND',
+						},
+						filter: { expression: `${KEY} = 'a'` },
+					},
+				],
+			},
+		} as unknown as Query;
+
+		const result = clearFilterFromQuery({
+			currentQuery: query,
+			filter: { attributeKey: { key: KEY, type: 'tag' } } as never,
+			activeQueryIndex: 0,
+		});
+
+		const active = result.builder.queryData[0];
+		expect(active.filters?.items).toStrictEqual([
+			expect.objectContaining({
+				key: expect.objectContaining({ key: 'http.method' }),
+			}),
+		]);
+		expect(active.filter?.expression).toBe(`http.method = 'GET'`);
+
+		// Other queries keep both halves: stripping their expression while leaving
+		// their items alone only churned a clause the round trip put straight back.
+		const other = result.builder.queryData[1];
+		expect(other.filters?.items).toHaveLength(1);
+		expect(other.filter?.expression).toBe(`${KEY} = 'a'`);
+	});
+});

frontend/src/components/QuickFilters/FilterRenderers/Checkbox/checkboxFilterQuery.ts

@@ -1,5 +1,8 @@
 /* eslint-disable sonarjs/no-identical-functions */
-import { removeKeysFromExpression } from 'components/QueryBuilderV2/utils';
+import {
+	convertFiltersToExpressionWithExistingQuery,
+	removeKeysFromExpression,
+} from 'components/QueryBuilderV2/utils';
 import {
 	IQuickFiltersConfig,
 	QuickFiltersSource,
@@ -10,13 +13,33 @@ import { cloneDeep, isArray } from 'lodash-es';
 import { Query, TagFilterItem } from 'types/api/queryBuilder/queryBuilderData';
 import { v4 as uuid } from 'uuid';
 
-import { isKeyMatch } from './utils';
+import { getKeySpellings, isKeyMatch } from './utils';
 import { CheckedState } from '../../types';
 import { SectionType } from './v2/itemRules';
 
 export const SELECTED_OPERATORS = [OPERATORS['='], 'in'];
 export const NON_SELECTED_OPERATORS = [OPERATORS['!='], 'not in', 'nin'];
 
+// The operators this algebra emits, and so the only ones it may rewrite out of an
+// expression. A hand-written clause on the same key (CONTAINS, EXISTS, a range) is
+// none of its business and has to survive a toggle.
+const MANAGED_OPERATORS = [OPERATORS['='], OPERATORS['!='], 'in', 'not in'];
+
+/**
+ * Drops this filter's own clauses for `key` from `expression`, leaving every other
+ * key and any clause the checkbox does not manage untouched. Matches all context
+ * prefixes, since `isKeyMatch` treats `service.name` and `resource.service.name` as
+ * the same filter but expression rewrites match keys literally.
+ */
+function removeManagedClauses(expression: string, key: string): string {
+	return removeKeysFromExpression(
+		expression,
+		getKeySpellings(key),
+		false,
+		MANAGED_OPERATORS,
+	);
+}
+
 // Sources that use backend APIs expecting short operator format (e.g., 'nin' instead of 'not in')
 const SOURCES_WITH_SHORT_OPERATORS = [QuickFiltersSource.INFRA_MONITORING];
 
@@ -102,8 +125,8 @@ export function deriveCheckboxState({
 }
 
 /**
- * Returns a new query with every clause for this attribute key removed, both
- * from the structured filter items and the raw filter expression.
+ * Returns a new query with this filter's clauses for the attribute key removed from
+ * the active query, both from the structured filter items and the raw expression.
  */
 export function clearFilterFromQuery({
 	currentQuery,
@@ -118,24 +141,28 @@ export function clearFilterFromQuery({
 		...currentQuery,
 		builder: {
 			...currentQuery.builder,
-			queryData: currentQuery.builder.queryData.map((item, idx) => ({
-				...item,
-				filter: {
-					expression: removeKeysFromExpression(item.filter?.expression ?? '', [
-						filter.attributeKey.key,
-					]),
-				},
-				filters: {
-					...item.filters,
-					items:
-						idx === activeQueryIndex
-							? item.filters?.items?.filter(
-									(fil) => !isKeyMatch(fil.key?.key, filter.attributeKey.key),
-								) || []
-							: [...(item.filters?.items || [])],
-					op: item.filters?.op || 'AND',
-				},
-			})),
+			queryData: currentQuery.builder.queryData.map((item, idx) => {
+				if (idx !== activeQueryIndex) {
+					return item;
+				}
+				return {
+					...item,
+					filter: {
+						expression: removeManagedClauses(
+							item.filter?.expression ?? '',
+							filter.attributeKey.key,
+						),
+					},
+					filters: {
+						...item.filters,
+						items:
+							item.filters?.items?.filter(
+								(fil) => !isKeyMatch(fil.key?.key, filter.attributeKey.key),
+							) || [],
+						op: item.filters?.op || 'AND',
+					},
+				};
+			}),
 		},
 	};
 }
@@ -194,12 +221,6 @@ export function applyCheckboxToggle({
 			(q) => !isKeyMatch(q.key?.key, filter.attributeKey.key),
 		);
 
-		if (query.filter?.expression) {
-			query.filter.expression = removeKeysFromExpression(query.filter.expression, [
-				filter.attributeKey.key,
-			]);
-		}
-
 		if (isOnlyOrAll === 'Only') {
 			const newFilterItem: TagFilterItem = {
 				id: uuid(),
@@ -267,12 +288,6 @@ export function applyCheckboxToggle({
 									}
 									return item;
 								});
-								if (query.filter?.expression) {
-									query.filter.expression = removeKeysFromExpression(
-										query.filter.expression,
-										[filter.attributeKey.key],
-									);
-								}
 							} else if (isArray(currentFilter.value)) {
 								// if we are removing some value when the running operator is IN we filter.
 								// example - key IN [value1,currentSelectedValue] becomes key IN [value1] in case of array
@@ -309,9 +324,10 @@ export function applyCheckboxToggle({
 							? currentFilter.value.includes(value)
 							: currentFilter.value === value;
 
-						// When clicking unchecked "Other" item, user wants to SELECT it
-						// Replace NOT IN filter with IN [value]
-						if (previousState === 'unchecked' && checked) {
+						// When clicking an unchecked value that is not itself excluded, the user
+						// wants to SELECT it: replace the NOT IN filter with IN [value]. A value
+						// that IS in the exclusion list falls through to the removal branch below.
+						if (previousState === 'unchecked' && checked && !isValueInFilter) {
 							const newFilter: TagFilterItem = {
 								id: uuid(),
 								op: getOperatorValue(OPERATORS.IN),
@@ -324,12 +340,6 @@ export function applyCheckboxToggle({
 								}
 								return item;
 							});
-							if (query.filter?.expression) {
-								query.filter.expression = removeKeysFromExpression(
-									query.filter.expression,
-									[filter.attributeKey.key],
-								);
-							}
 						} else if (!checked || !isValueInFilter) {
 							// Add to NOT IN when:
 							// - checked=false (user explicitly unchecked to exclude)
@@ -369,12 +379,6 @@ export function applyCheckboxToggle({
 									query.filters.items = query.filters.items.filter(
 										(item) => !isKeyMatch(item.key?.key, filter.attributeKey.key),
 									);
-									if (query.filter?.expression) {
-										query.filter.expression = removeKeysFromExpression(
-											query.filter.expression,
-											[filter.attributeKey.key],
-										);
-									}
 								} else {
 									query.filters.items = query.filters.items.map((item) => {
 										if (isKeyMatch(item.key?.key, filter.attributeKey.key)) {
@@ -384,16 +388,6 @@ export function applyCheckboxToggle({
 									});
 								}
 							} else {
-								const newFilter = {
-									...currentFilter,
-									value: currentFilter.value === value ? null : currentFilter.value,
-								};
-								if (newFilter.value === null && query.filter?.expression) {
-									query.filter.expression = removeKeysFromExpression(
-										query.filter.expression,
-										[filter.attributeKey.key],
-									);
-								}
 								query.filters.items = query.filters.items.filter(
 									(item) => !isKeyMatch(item.key?.key, filter.attributeKey.key),
 								);
@@ -456,6 +450,18 @@ export function applyCheckboxToggle({
 		}
 	}
 
+	if (query) {
+		const synced = convertFiltersToExpressionWithExistingQuery(
+			query.filters ?? { items: [], op: 'AND' },
+			removeManagedClauses(
+				query.filter?.expression ?? '',
+				filter.attributeKey.key,
+			),
+		);
+		query.filter = synced.filter;
+		query.filters = synced.filters;
+	}
+
 	return {
 		...currentQuery,
 		builder: {

frontend/src/components/QuickFilters/FilterRenderers/Checkbox/utils.ts

@@ -39,3 +39,16 @@ export function isKeyMatch(
 ): boolean {
 	return getKeyWithoutPrefix(itemKey) === getKeyWithoutPrefix(filterKey);
 }
+
+/**
+ * Every spelling of a key that `isKeyMatch` treats as equal: the base name plus
+ * each context-prefixed form. Expression rewrites match keys literally, so they
+ * need the whole list where the items side only needs `isKeyMatch`.
+ */
+export function getKeySpellings(key: string | undefined): string[] {
+	const base = getKeyWithoutPrefix(key);
+	if (!base) {
+		return [];
+	}
+	return [base, ...FIELD_CONTEXT_PREFIXES.map((prefix) => `${prefix}.${base}`)];
+}

frontend/src/container/InfraMonitoringK8sV2/EntityDetailsUtils/EntityMetrics/configBuilder.ts

@@ -1,5 +1,4 @@
 import { Timezone } from 'components/CustomTimePicker/timezoneUtils';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import { getLegend } from 'lib/dashboard/getQueryResults';
 import getLabelName from 'lib/getLabelName';
 import {
@@ -76,7 +75,7 @@ export function buildEntityMetricsChartConfig({
 		show: true,
 		side: 2,
 		isDarkMode,
-		panelType: PANEL_TYPES.TIME_SERIES,
+		isTimeAxis: true,
 	});
 
 	builder.addAxis({
@@ -85,7 +84,6 @@ export function buildEntityMetricsChartConfig({
 		side: 3,
 		isDarkMode,
 		yAxisUnit,
-		panelType: PANEL_TYPES.TIME_SERIES,
 	});
 
 	if (!apiResponse?.data?.result) {

frontend/src/container/MeterExplorer/Explorer/configBuilder.ts

@@ -1,5 +1,4 @@
 import { Timezone } from 'components/CustomTimePicker/timezoneUtils';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import { getLegend } from 'lib/dashboard/getQueryResults';
 import getLabelName from 'lib/getLabelName';
 import {
@@ -72,7 +71,7 @@ export function buildMeterChartConfig({
 		show: true,
 		side: 2,
 		isDarkMode,
-		panelType: PANEL_TYPES.BAR,
+		isTimeAxis: true,
 	});
 
 	builder.addAxis({
@@ -81,7 +80,6 @@ export function buildMeterChartConfig({
 		side: 3,
 		isDarkMode,
 		yAxisUnit,
-		panelType: PANEL_TYPES.BAR,
 	});
 
 	if (!apiResponse?.data?.result) {

frontend/src/container/QueryBuilder/filters/QueryBuilderSearchV2/QueryBuilderSearchV2.tsx

@@ -21,7 +21,7 @@ import {
 import { DEBOUNCE_DELAY } from 'constants/queryBuilderFilterConfig';
 import type { WhereClauseConfig } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import { LogsExplorerShortcuts } from 'constants/shortcuts/logsExplorerShortcuts';
-import { useDashboardVariablesByType } from 'hooks/dashboard/useDashboardVariablesByType';
+import { useDynamicVariableSuggestions } from 'hooks/dashboard/useDynamicVariableSuggestions';
 import { useKeyboardHotkeys } from 'hooks/hotkeys/useKeyboardHotkeys';
 import { useGetAggregateKeys } from 'hooks/queryBuilder/useGetAggregateKeys';
 import { useGetAggregateValues } from 'hooks/queryBuilder/useGetAggregateValues';
@@ -263,10 +263,7 @@ function QueryBuilderSearchV2(
 		return false;
 	}, [currentState, query.aggregateAttribute?.dataType, query.dataSource]);
 
-	const dashboardDynamicVariables = useDashboardVariablesByType(
-		'DYNAMIC',
-		'values',
-	);
+	const dashboardDynamicVariables = useDynamicVariableSuggestions();
 
 	const { data, isFetching } = useGetAggregateKeys(
 		{
@@ -816,9 +813,8 @@ function QueryBuilderSearchV2(
 				values.push(...(attributeValues?.payload?.[key] || []));
 
 				// here we want to suggest the variable name matching with the key here, we will go over the dynamic variables for the keys
-				const variableName = dashboardDynamicVariables?.find(
-					(variable) =>
-						variable?.dynamicVariablesAttribute === currentFilterItem?.key?.key,
+				const variableName = dashboardDynamicVariables.find(
+					(variable) => variable.attribute === currentFilterItem?.key?.key,
 				)?.name;
 
 				if (variableName) {

frontend/src/container/QueryBuilder/filters/QueryBuilderSearchV2/__test__/QueryBuilderSearchV2.test.tsx

@@ -5,9 +5,8 @@ import {
 	initialQueriesMap,
 	initialQueryBuilderFormValues,
 } from 'constants/queryBuilder';
-import { IUseDashboardVariablesReturn } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
+import { DynamicVariableSuggestion } from 'providers/Dashboard/store/dynamicVariableSuggestions';
 import { QueryBuilderContext } from 'providers/QueryBuilder';
-import { IDashboardVariable } from 'types/api/dashboard/variables';
 import { DataTypes } from 'types/api/queryBuilder/queryAutocompleteResponse';
 import { DataSource } from 'types/common/queryBuilder';
 
@@ -150,24 +149,14 @@ jest.mock('hooks/useSafeNavigate', () => ({
 	}),
 }));
 
-// Mock dashboard variables
-const dashboardVariables = {
-	service: {
-		id: 'service',
-		name: 'service',
-		type: 'DYNAMIC' as IDashboardVariable['type'],
-		dynamicVariablesAttribute: 'service.name',
-		description: '',
-		sort: 'DISABLED' as IDashboardVariable['sort'],
-		multiSelect: false,
-		showALLOption: false,
-	},
-};
+// Mock the dynamic variables the open dashboard would publish
+const dynamicVariableSuggestions = [
+	{ name: 'service', attribute: 'service.name' },
+];
 
-jest.mock('hooks/dashboard/useDashboardVariables', () => ({
-	useDashboardVariables: (): IUseDashboardVariablesReturn => ({
-		dashboardVariables: dashboardVariables,
-	}),
+jest.mock('hooks/dashboard/useDynamicVariableSuggestions', () => ({
+	useDynamicVariableSuggestions: (): DynamicVariableSuggestion[] =>
+		dynamicVariableSuggestions,
 }));
 
 describe('Suggestion Key -> Operator -> Value Flow', () => {

frontend/src/container/ServiceApplication/utils.ts

@@ -2,7 +2,6 @@ import { PANEL_TYPES } from 'constants/queryBuilder';
 import { getWidgetQueryBuilder } from 'container/MetricsApplication/MetricsApplication.factory';
 import { updateStepInterval } from 'hooks/queryBuilder/useStepInterval';
 import { GetQueryResultsProps } from 'lib/dashboard/getQueryResults';
-import { getDashboardVariables } from 'lib/dashboardVariables/getDashboardVariables';
 import { ServicesList } from 'types/api/metrics/getService';
 import { QueryDataV3 } from 'types/api/widgets/getQuery';
 import { EQueryType } from 'types/common/dashboard';
@@ -47,7 +46,6 @@ export const getQueryRangeRequestData = ({
 			graphType: serviceMetricsWidget?.panelTypes,
 			query: updatedQuery,
 			globalSelectedInterval,
-			variables: getDashboardVariables(),
 		});
 	});
 	return requestData;

frontend/src/container/WidgetCard/Card/FullView/index.tsx

@@ -28,13 +28,11 @@ import { populateMultipleResults } from 'lib/query/populateMultipleResults';
 import { timeItems, timePreferance } from 'constants/timePreference';
 import PanelWrapper from 'container/WidgetCard/Panels/PanelWrapper';
 import RightToolbarActions from 'container/QueryBuilder/components/ToolbarActions/RightToolbarActions';
-import { useDashboardVariables } from 'hooks/dashboard/useDashboardVariables';
 import { useGetQueryRange } from 'hooks/queryBuilder/useGetQueryRange';
 import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
 import { useChartMutable } from 'hooks/useChartMutable';
 import useUrlQuery from 'hooks/useUrlQuery';
 import { GetQueryResultsProps } from 'lib/dashboard/getQueryResults';
-import { getDashboardVariables } from 'lib/dashboardVariables/getDashboardVariables';
 import GetMinMax from 'lib/getMinMax';
 import { isEmpty } from 'lodash-es';
 import { AppState } from 'store/reducers';
@@ -82,8 +80,6 @@ function FullView({
 		setCurrentGraphRef(fullViewRef);
 	}, [setCurrentGraphRef]);
 
-	const { dashboardVariables } = useDashboardVariables();
-
 	const getSelectedTime = useCallback(
 		() =>
 			timeItems.find((e) => e.enum === (widget?.timePreferance || 'GLOBAL_TIME')),
@@ -115,7 +111,6 @@ function FullView({
 				graphType: getGraphType(selectedPanelType),
 				query: updatedQuery,
 				globalSelectedInterval: globalSelectedTime,
-				variables: getDashboardVariables(dashboardVariables),
 				fillGaps: widget.fillSpans,
 				formatForWeb: selectedPanelType === PANEL_TYPES.TABLE,
 				originalGraphType: selectedPanelType,
@@ -126,7 +121,6 @@ function FullView({
 			graphType: PANEL_TYPES.LIST,
 			selectedTime: widget?.timePreferance || 'GLOBAL_TIME',
 			globalSelectedInterval: globalSelectedTime,
-			variables: getDashboardVariables(dashboardVariables),
 			tableParams: {
 				pagination: {
 					offset: 0,

frontend/src/container/WidgetCard/Card/index.tsx

@@ -8,12 +8,9 @@ import { PANEL_TYPES } from 'constants/queryBuilder';
 import { useScrollWidgetIntoView } from 'lib/visualization/hooks/useScrollWidgetIntoView';
 import { populateMultipleResults } from 'lib/query/populateMultipleResults';
 import { CustomTimeType } from 'container/TopNav/DateTimeSelectionV2/types';
-import { useIsPanelWaitingOnVariable } from 'hooks/dashboard/useVariableFetchState';
 import { useGetQueryRange } from 'hooks/queryBuilder/useGetQueryRange';
 import { useIntersectionObserver } from 'hooks/useIntersectionObserver';
 import { GetQueryResultsProps } from 'lib/dashboard/getQueryResults';
-import { getDashboardVariables } from 'lib/dashboardVariables/getDashboardVariables';
-import { getVariableReferencesInQuery } from 'lib/dashboardVariables/variableReference';
 import getTimeString from 'lib/getTimeString';
 import { isEqual } from 'lodash-es';
 import isEmpty from 'lodash-es/isEmpty';
@@ -45,7 +42,6 @@ function GridCardGraph({
 	headerMenuList = [MenuItemKeys.View],
 	isQueryEnabled,
 	threshold,
-	variables,
 	version,
 	onClickHandler,
 	onDragSelect,
@@ -113,25 +109,10 @@ function GridCardGraph({
 
 	const updatedQuery = widget?.query;
 
-	const referencedVariableNames = useMemo(() => {
-		if (!variables || !updatedQuery) {
-			return [];
-		}
-		const allNames = Object.values(variables)
-			.map((v) => v.name)
-			.filter((name): name is string => !!name);
-		return getVariableReferencesInQuery(updatedQuery, allNames);
-	}, [updatedQuery, variables]);
-
 	const isEmptyWidget =
 		widget?.id === PANEL_TYPES.EMPTY_WIDGET || isEmpty(widget);
 
-	const isPanelWaitingOnAnyVariable = useIsPanelWaitingOnVariable(
-		referencedVariableNames,
-	);
-
-	const queryEnabledCondition =
-		isVisible && !isEmptyWidget && isQueryEnabled && !isPanelWaitingOnAnyVariable;
+	const queryEnabledCondition = isVisible && !isEmptyWidget && isQueryEnabled;
 
 	const [requestData, setRequestData] = useState<GetQueryResultsProps>(() => {
 		if (widget.panelTypes !== PANEL_TYPES.LIST) {
@@ -140,7 +121,6 @@ function GridCardGraph({
 				graphType: getGraphType(widget.panelTypes),
 				query: updatedQuery,
 				globalSelectedInterval,
-				variables: getDashboardVariables(variables),
 				fillGaps: widget.fillSpans,
 				formatForWeb: widget.panelTypes === PANEL_TYPES.TABLE,
 				start: customTimeRange?.startTime || start,
@@ -191,7 +171,6 @@ function GridCardGraph({
 	const queryResponse = useGetQueryRange(
 		{
 			...requestData,
-			variables: getDashboardVariables(variables),
 			selectedTime: widget.timePreferance || 'GLOBAL_TIME',
 			globalSelectedInterval:
 				widget?.panelTypes === PANEL_TYPES.LIST && isLogsQuery
@@ -214,14 +193,6 @@ function GridCardGraph({
 				widget.timePreferance,
 				widget.fillSpans,
 				requestData,
-				variables
-					? Object.entries(variables).reduce((acc, [id, variable]) => {
-							if (variable.name && referencedVariableNames.includes(variable.name)) {
-								return { ...acc, [id]: variable.selectedValue };
-							}
-							return acc;
-						}, {})
-					: {},
 				...(customTimeRange && customTimeRange.startTime && customTimeRange.endTime
 					? [customTimeRange.startTime, customTimeRange.endTime]
 					: []),
@@ -303,9 +274,7 @@ function GridCardGraph({
 					version={version}
 					threshold={threshold}
 					headerMenuList={menuList}
-					isFetchingResponse={
-						queryResponse.isFetching || isPanelWaitingOnAnyVariable
-					}
+					isFetchingResponse={queryResponse.isFetching}
 					setRequestData={setRequestData}
 					onClickHandler={onClickHandler}
 					onDragSelect={onDragSelect}

frontend/src/container/WidgetCard/Card/types.ts

@@ -4,7 +4,6 @@ import { ToggleGraphProps } from 'components/Graph/types';
 import { GetQueryResultsProps } from 'lib/dashboard/getQueryResults';
 import { RowData } from 'lib/query/createTableColumnsFromQuery';
 import { OnClickPluginOpts } from 'lib/uPlotLib/plugins/onClickPlugin';
-import { IDashboardVariables } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
 import { Widgets } from 'types/api/widgets/widget';
 import {
 	MetricQueryRangeSuccessResponse,
@@ -52,7 +51,6 @@ export interface GridCardGraphProps {
 	headerMenuList?: WidgetGraphComponentProps['headerMenuList'];
 	onClickHandler?: OnClickPluginOpts['onClick'];
 	isQueryEnabled: boolean;
-	variables?: IDashboardVariables;
 	version?: string;
 	onDragSelect: (start: number, end: number) => void;
 	customOnDragSelect?: (start: number, end: number) => void;

frontend/src/container/WidgetCard/__tests__/useResolveQuery.test.tsx

@@ -26,8 +26,8 @@ jest.mock(
 	}),
 );
 
-jest.mock('hooks/dashboard/useDashboardVariablesByType', () => ({
-	useDashboardVariablesByType: (): unknown[] => mockDynamicVariables,
+jest.mock('hooks/dashboard/useDynamicVariableSuggestions', () => ({
+	useDynamicVariableSuggestions: (): unknown[] => mockDynamicVariables,
 }));
 
 jest.mock('react-redux', () => ({
@@ -64,11 +64,12 @@ describe('useResolveQuery', () => {
 		expect(resolved).toBe(QUERY);
 	});
 
-	it('resolves through substitute_vars when the dashboard has variables', async () => {
+	it('resolves through substitute_vars when the dashboard has dynamic variables', async () => {
 		mockGetSubstituteVars.mockResolvedValue({
 			httpStatusCode: 200,
 			data: { compositeQuery: {} },
 		});
+		mockDynamicVariables.push({ name: 'env', attribute: 'deployment.env' });
 
 		const { result } = renderHook(() => useUpdatedQuery(), {
 			wrapper: MockQueryClientProvider,
@@ -76,13 +77,6 @@ describe('useResolveQuery', () => {
 
 		const resolved = await result.current.getUpdatedQuery({
 			widgetConfig: WIDGET_CONFIG,
-			dashboardData: {
-				data: {
-					variables: {
-						env: { name: 'env', selectedValue: 'prod' },
-					},
-				},
-			},
 		});
 
 		expect(mockGetSubstituteVars).toHaveBeenCalledTimes(1);

frontend/src/container/WidgetCard/hooks/useResolveQuery.ts

@@ -7,8 +7,7 @@ import { getSubstituteVars } from 'api/dashboard/substitute_vars';
 import { prepareQueryRangePayloadV5 } from 'api/v5/v5';
 import { PANEL_TYPES } from 'constants/queryBuilder';
 import { timePreferenceType } from 'constants/timePreference';
-import { useDashboardVariablesByType } from 'hooks/dashboard/useDashboardVariablesByType';
-import { getDashboardVariables } from 'lib/dashboardVariables/getDashboardVariables';
+import { useDynamicVariableSuggestions } from 'hooks/dashboard/useDynamicVariableSuggestions';
 import { mapQueryDataFromApi } from 'lib/newQueryBuilder/queryBuilderMappers/mapQueryDataFromApi';
 import { AppState } from 'store/reducers';
 import { Query } from 'types/api/queryBuilder/queryBuilderData';
@@ -21,7 +20,6 @@ interface UseUpdatedQueryOptions {
 		panelTypes: PANEL_TYPES;
 		timePreferance: timePreferenceType;
 	};
-	dashboardData?: any;
 }
 
 interface UseUpdatedQueryResult {
@@ -37,34 +35,27 @@ function useUpdatedQuery(): UseUpdatedQueryResult {
 
 	const queryRangeMutation = useMutation(getSubstituteVars);
 
-	const dashboardDynamicVariables = useDashboardVariablesByType(
-		'DYNAMIC',
-		'values',
-	);
+	const dashboardDynamicVariables = useDynamicVariableSuggestions();
 
 	const getUpdatedQuery = useCallback(
-		async ({
-			widgetConfig,
-			dashboardData,
-		}: UseUpdatedQueryOptions): Promise<Query> => {
-			const variables = getDashboardVariables(dashboardData?.data?.variables);
-
+		async ({ widgetConfig }: UseUpdatedQueryOptions): Promise<Query> => {
 			// `/substitute_vars` only rewrites `$variable` references, so on surfaces with no
 			// dashboard behind them (APM, Celery, API monitoring) the round-trip is a no-op.
-			if (isEmpty(variables) && isEmpty(dashboardDynamicVariables)) {
+			if (isEmpty(dashboardDynamicVariables)) {
 				return widgetConfig.query;
 			}
 
 			// Prepare query payload with resolved variables
-			const { queryPayload } = prepareQueryRangePayloadV5({
-				query: widgetConfig.query,
-				graphType: getGraphType(widgetConfig.panelTypes),
-				selectedTime: widgetConfig.timePreferance,
-				globalSelectedInterval,
-				variables,
-				originalGraphType: widgetConfig.panelTypes,
-				dynamicVariables: dashboardDynamicVariables,
-			});
+			const { queryPayload } = prepareQueryRangePayloadV5(
+				{
+					query: widgetConfig.query,
+					graphType: getGraphType(widgetConfig.panelTypes),
+					selectedTime: widgetConfig.timePreferance,
+					globalSelectedInterval,
+					originalGraphType: widgetConfig.panelTypes,
+				},
+				dashboardDynamicVariables,
+			);
 
 			// Execute query and process results
 			const queryResult = await queryRangeMutation.mutateAsync(queryPayload);

frontend/src/hooks/dashboard/__test__/useGetResolvedText.test.tsx

@@ -1,242 +1,40 @@
-import React from 'react';
 import { renderHook } from '@testing-library/react';
-import { IDashboardVariables } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
-
-import useGetResolvedText from '../useGetResolvedText';
-
-// Create a mock function that we can modify per test
-let mockDashboardVariables: IDashboardVariables = {};
-
-// Mock the useDashboardVariables hook
-jest.mock('hooks/dashboard/useDashboardVariables', () => ({
-	useDashboardVariables: jest.fn(() => ({
-		dashboardVariables: mockDashboardVariables,
-	})),
-}));
+import useGetResolvedText from 'hooks/dashboard/useGetResolvedText';
 
 describe('useGetResolvedText', () => {
-	const SERVICE_VAR = 'test, app +2-|-test, app, frontend, env';
-	const SEVERITY_VAR = 'DEBUG, INFO-|-DEBUG, INFO';
-	const EXPECTED_FULL_TEXT =
-		'Logs count in test, app, frontend, env in DEBUG, INFO';
-	const TRUNCATED_SERVICE = 'test, app +2';
-	const TEXT_TEMPLATE = 'Logs count in $service.name in $severity';
-
-	const renderHookWithProps = (
-		props: {
-			text: string | React.ReactNode;
-			maxLength?: number;
-			matcher?: string;
-		},
-		variables?: Record<string, string | number | boolean>,
-	): any => {
-		if (variables) {
-			mockDashboardVariables = Object.entries(
-				variables,
-			).reduce<IDashboardVariables>((acc, [key, value]) => {
-				acc[key] = {
-					id: key,
-					name: key,
-					description: '',
-					type: 'CUSTOM' as const,
-					sort: 'DISABLED' as const,
-					multiSelect: false,
-					showALLOption: false,
-					selectedValue: value,
-				};
-				return acc;
-			}, {});
-		} else {
-			mockDashboardVariables = {};
-		}
-		return renderHook(() => useGetResolvedText(props));
-	};
-
-	it('should resolve variables with truncated and full text', () => {
-		const text = TEXT_TEMPLATE;
-		const variables = {
-			'service.name': SERVICE_VAR,
-			severity: SEVERITY_VAR,
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.truncatedText).toBe(
-			`Logs count in ${TRUNCATED_SERVICE} in DEBUG, INFO`,
+	it('returns the text unchanged when it fits within maxLength', () => {
+		const { result } = renderHook(() =>
+			useGetResolvedText({ text: 'Logs count', maxLength: 100 }),
 		);
-		expect(result.current.fullText).toBe(EXPECTED_FULL_TEXT);
+
+		expect(result.current.fullText).toBe('Logs count');
+		expect(result.current.truncatedText).toBe('Logs count');
 	});
 
-	it('should handle text with maxLength truncation', () => {
-		const text = TEXT_TEMPLATE;
-		const variables = {
-			'service.name': SERVICE_VAR,
-			severity: SEVERITY_VAR,
-		};
+	it('returns the text unchanged when no maxLength is given', () => {
+		const text = 'a'.repeat(200);
+		const { result } = renderHook(() => useGetResolvedText({ text }));
 
-		const { result } = renderHookWithProps({ text, maxLength: 20 }, variables);
-
-		expect(result.current.truncatedText).toBe('Logs count in test, a...');
-		expect(result.current.fullText).toBe(EXPECTED_FULL_TEXT);
-	});
-
-	it('should handle multiple occurrences of the same variable', () => {
-		const text = 'Logs count in $service.name and $service.name';
-		const variables = {
-			'service.name': SERVICE_VAR,
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.truncatedText).toBe(
-			'Logs count in test, app +2 and test, app +2',
-		);
-		expect(result.current.fullText).toBe(
-			'Logs count in test, app, frontend, env and test, app, frontend, env',
-		);
-	});
-
-	it('should handle different variable formats', () => {
-		const text =
-			'Logs in $service.name, {{service.name}}, [[service.name]] - $dyn-service.name';
-		const variables = {
-			'service.name': SERVICE_VAR,
-			'$dyn-service.name': 'dyn-1, dyn-2',
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.truncatedText).toBe(
-			'Logs in test, app +2, test, app +2, test, app +2 - dyn-1, dyn-2',
-		);
-		expect(result.current.fullText).toBe(
-			'Logs in test, app, frontend, env, test, app, frontend, env, test, app, frontend, env - dyn-1, dyn-2',
-		);
-	});
-
-	it('should handle custom matcher', () => {
-		const text = 'Logs count in #service.name in #severity';
-		const variables = {
-			'service.name': SERVICE_VAR,
-			severity: SEVERITY_VAR,
-		};
-
-		const { result } = renderHookWithProps({ text, matcher: '#' }, variables);
-
-		expect(result.current.truncatedText).toBe(
-			'Logs count in test, app +2 in DEBUG, INFO',
-		);
-		expect(result.current.fullText).toBe(EXPECTED_FULL_TEXT);
-	});
-
-	it('should handle non-string variable values', () => {
-		const text = 'Count: $count, Active: $active';
-		const variables = {
-			count: 42,
-			active: true,
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.fullText).toBe('Count: 42, Active: true');
-		expect(result.current.truncatedText).toBe('Count: 42, Active: true');
-	});
-
-	it('should keep original text for undefined variables', () => {
-		const text = 'Logs count in $service.name in $unknown';
-		const variables = {
-			'service.name': SERVICE_VAR,
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.truncatedText).toBe(
-			'Logs count in test, app +2 in $unknown',
-		);
-		expect(result.current.fullText).toBe(
-			'Logs count in test, app, frontend, env in $unknown',
-		);
-	});
-
-	it('should handle non-string text input (ReactNode)', () => {
-		const reactNodeText = <div>Test ReactNode</div>;
-		const variables = {
-			'service.name': SERVICE_VAR,
-		};
-
-		const { result } = renderHookWithProps(
-			{
-				text: reactNodeText,
-			},
-			variables,
-		);
-
-		// Should return the ReactNode unchanged
-		expect(result.current.fullText).toBe(reactNodeText);
-		expect(result.current.truncatedText).toBe(reactNodeText);
-	});
-
-	it('should handle number input', () => {
-		const text = 123;
-		const variables = {
-			'service.name': SERVICE_VAR,
-		};
-
-		const { result } = renderHookWithProps(
-			{
-				text,
-			},
-			variables,
-		);
-
-		// Should return the number unchanged
-		expect(result.current.fullText).toBe(text);
 		expect(result.current.truncatedText).toBe(text);
 	});
 
-	it('should handle boolean input', () => {
-		const text = true;
-		const variables = {
-			'service.name': SERVICE_VAR,
-		};
-
-		const { result } = renderHookWithProps(
-			{
-				text,
-			},
-			variables,
+	it('truncates to maxLength with an ellipsis and keeps the full text', () => {
+		const { result } = renderHook(() =>
+			useGetResolvedText({ text: 'Logs count in production', maxLength: 20 }),
 		);
 
-		// Should return the boolean unchanged
-		expect(result.current.fullText).toBe(text);
-		expect(result.current.truncatedText).toBe(text);
+		expect(result.current.truncatedText).toBe('Logs count in pro...');
+		expect(result.current.truncatedText).toHaveLength(20);
+		expect(result.current.fullText).toBe('Logs count in production');
 	});
 
-	it('should handle complex variable names with improved patterns', () => {
-		const text = 'API: $api.v1.endpoint Config: $config.database.host';
-		const variables = {
-			'api.v1.endpoint': '/users',
-			'config.database.host': 'localhost:5432',
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.fullText).toBe('API: /users Config: localhost:5432');
-		expect(result.current.truncatedText).toBe(
-			'API: /users Config: localhost:5432',
+	it('passes non-string content through untouched', () => {
+		const node = <span>title</span>;
+		const { result } = renderHook(() =>
+			useGetResolvedText({ text: node, maxLength: 2 }),
 		);
-	});
 
-	it('should stop at punctuation boundaries correctly', () => {
-		const text = 'Status: $service.name, Error: $error.type;';
-		const variables = {
-			'service.name': 'web-api',
-			'error.type': 'timeout',
-		};
-
-		const { result } = renderHookWithProps({ text }, variables);
-
-		expect(result.current.fullText).toBe('Status: web-api, Error: timeout;');
-		expect(result.current.truncatedText).toBe('Status: web-api, Error: timeout;');
+		expect(result.current.fullText).toBe(node);
+		expect(result.current.truncatedText).toBe(node);
 	});
 });

frontend/src/hooks/dashboard/__test__/useIsPanelWaitingOnVariable.test.ts

@@ -1,351 +0,0 @@
-import { act, renderHook } from '@testing-library/react';
-import { dashboardVariablesStore } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStore';
-import { IDashboardVariablesStoreState } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
-import {
-	VariableFetchState,
-	variableFetchStore,
-} from 'providers/Dashboard/store/variableFetchStore';
-import { IDashboardVariable } from 'types/api/dashboard/variables';
-
-import { useIsPanelWaitingOnVariable } from '../useVariableFetchState';
-
-function makeVariable(
-	overrides: Partial<IDashboardVariable> & { id: string },
-): IDashboardVariable {
-	return {
-		name: overrides.id,
-		description: '',
-		type: 'QUERY',
-		sort: 'DISABLED',
-		multiSelect: false,
-		showALLOption: false,
-		...overrides,
-	};
-}
-
-function resetStores(): void {
-	variableFetchStore.set(() => ({
-		states: {},
-		lastUpdated: {},
-		cycleIds: {},
-	}));
-	dashboardVariablesStore.set(() => ({
-		dashboardId: '',
-		variables: {},
-		sortedVariablesArray: [],
-		dependencyData: null,
-		variableTypes: {},
-		dynamicVariableOrder: [],
-	}));
-}
-
-function setFetchStates(states: Record<string, VariableFetchState>): void {
-	variableFetchStore.set(() => ({
-		states,
-		lastUpdated: {},
-		cycleIds: {},
-	}));
-}
-
-function setDashboardVariables(
-	overrides: Partial<IDashboardVariablesStoreState>,
-): void {
-	dashboardVariablesStore.set(() => ({
-		dashboardId: '',
-		variables: {},
-		sortedVariablesArray: [],
-		dependencyData: null,
-		variableTypes: {},
-		dynamicVariableOrder: [],
-		...overrides,
-	}));
-}
-
-describe('useIsPanelWaitingOnVariable', () => {
-	beforeEach(() => {
-		resetStores();
-	});
-
-	it('should return false when variableNames is empty', () => {
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable([]));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return false when all referenced variables are idle', () => {
-		setFetchStates({ a: 'idle', b: 'idle' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: 'val1' }),
-				b: makeVariable({ id: 'b', selectedValue: 'val2' }),
-			},
-			variableTypes: { a: 'QUERY', b: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a', 'b']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return true when a variable is loading with empty selectedValue', () => {
-		setFetchStates({ a: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: undefined }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should return true when a variable is waiting with empty selectedValue', () => {
-		setFetchStates({ a: 'waiting' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: '' }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should return true when a variable is revalidating with empty selectedValue', () => {
-		setFetchStates({ a: 'revalidating' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: undefined }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should return false when a variable is loading but has a selectedValue', () => {
-		setFetchStates({ a: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: 'some-value' }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return false for DYNAMIC variable with allSelected=true that is loading but has a selectedValue', () => {
-		setFetchStates({ dyn: 'loading' });
-		setDashboardVariables({
-			variables: {
-				dyn: makeVariable({
-					id: 'dyn',
-					type: 'DYNAMIC',
-					selectedValue: 'some-val',
-					allSelected: true,
-				}),
-			},
-			variableTypes: { dyn: 'DYNAMIC' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['dyn']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return false for DYNAMIC variable with allSelected=true that is waiting but has a selectedValue', () => {
-		setFetchStates({ dyn: 'waiting' });
-		setDashboardVariables({
-			variables: {
-				dyn: makeVariable({
-					id: 'dyn',
-					type: 'DYNAMIC',
-					selectedValue: 'val',
-					allSelected: true,
-				}),
-			},
-			variableTypes: { dyn: 'DYNAMIC' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['dyn']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return false for DYNAMIC variable with allSelected=true that is idle', () => {
-		setFetchStates({ dyn: 'idle' });
-		setDashboardVariables({
-			variables: {
-				dyn: makeVariable({
-					id: 'dyn',
-					type: 'DYNAMIC',
-					selectedValue: 'val',
-					allSelected: true,
-				}),
-			},
-			variableTypes: { dyn: 'DYNAMIC' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['dyn']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return false for non-DYNAMIC variable with allSelected=false and non-empty value that is loading', () => {
-		setFetchStates({ a: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({
-					id: 'a',
-					selectedValue: 'val',
-					allSelected: false,
-				}),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return true if any one of multiple variables is blocking', () => {
-		setFetchStates({ a: 'idle', b: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: 'val' }),
-				b: makeVariable({ id: 'b', selectedValue: undefined }),
-			},
-			variableTypes: { a: 'QUERY', b: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a', 'b']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should return false when variable has no entry in fetch store (treated as idle)', () => {
-		setFetchStates({}); // no state entry for 'a'
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: 'val' }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should return false when variable is in error state with empty selectedValue', () => {
-		setFetchStates({ a: 'error' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: undefined }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should react to store updates', () => {
-		setFetchStates({ a: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: undefined }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(true);
-
-		// Simulate variable fetch completing
-		act(() => {
-			variableFetchStore.update((d) => {
-				d.states.a = 'idle';
-			});
-		});
-
-		expect(result.current).toBe(false);
-	});
-
-	it('should handle DYNAMIC variable with allSelected=false and empty selectedValue as blocking', () => {
-		setFetchStates({ dyn: 'loading' });
-		setDashboardVariables({
-			variables: {
-				dyn: makeVariable({
-					id: 'dyn',
-					type: 'DYNAMIC',
-					selectedValue: undefined,
-					allSelected: false,
-				}),
-			},
-			variableTypes: { dyn: 'DYNAMIC' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['dyn']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should handle variable with array selectedValue as non-blocking when loading', () => {
-		setFetchStates({ a: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: ['val1', 'val2'] }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(false);
-	});
-
-	it('should handle variable with empty array selectedValue as blocking when loading', () => {
-		setFetchStates({ a: 'loading' });
-		setDashboardVariables({
-			variables: {
-				a: makeVariable({ id: 'a', selectedValue: [] }),
-			},
-			variableTypes: { a: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['a']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should find variable by name when store key differs from variable name', () => {
-		setFetchStates({ myVar: 'loading' });
-		setDashboardVariables({
-			variables: {
-				'uuid-abc-123': makeVariable({
-					id: 'uuid-abc-123',
-					name: 'myVar',
-					selectedValue: undefined,
-				}),
-			},
-			variableTypes: { myVar: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['myVar']));
-		expect(result.current).toBe(true);
-	});
-
-	it('should respect selectedValue when store key differs from variable name', () => {
-		// When the variable has a value, it should not block even if loading
-		setFetchStates({ myVar: 'loading' });
-		setDashboardVariables({
-			variables: {
-				'uuid-abc-123': makeVariable({
-					id: 'uuid-abc-123',
-					name: 'myVar',
-					selectedValue: 'production',
-				}),
-			},
-			variableTypes: { myVar: 'QUERY' },
-		});
-
-		const { result } = renderHook(() => useIsPanelWaitingOnVariable(['myVar']));
-		expect(result.current).toBe(false);
-	});
-});

frontend/src/hooks/dashboard/useContextVariables.tsx

@@ -1,7 +1,6 @@
 import { useMemo } from 'react';
 // eslint-disable-next-line no-restricted-imports
 import { useSelector } from 'react-redux';
-import { useDashboardVariables } from 'hooks/dashboard/useDashboardVariables';
 import { AppState } from 'store/reducers';
 import { GlobalReducer } from 'types/reducer/globalTime';
 
@@ -42,38 +41,10 @@ function useContextVariables({
 	// ! To be noted: This customVariables is not Dashboard Custom Variables
 	customVariables,
 }: UseContextVariablesProps): UseContextVariablesResult {
-	const { dashboardVariables } = useDashboardVariables();
 	const globalTime = useSelector<AppState, GlobalReducer>(
 		(state) => state.globalTime,
 	);
 
-	// Extract dashboard variables
-	const processedDashboardVariables = useMemo(() => {
-		return Object.entries(dashboardVariables)
-			.filter(([, value]) => value.name)
-			.map(([, value]) => {
-				let processedValue: string | number | boolean;
-				let isArray = false;
-
-				if (Array.isArray(value.selectedValue)) {
-					processedValue = value.selectedValue.join(', ');
-					isArray = true;
-				} else if (value.selectedValue != null) {
-					processedValue = value.selectedValue;
-				} else {
-					processedValue = '';
-				}
-
-				return {
-					name: value.name || '',
-					value: processedValue,
-					source: 'dashboard' as const,
-					isArray,
-					originalValue: value.selectedValue,
-				};
-			});
-	}, [dashboardVariables]);
-
 	// Extract global variables
 	const globalVariables = useMemo(
 		() => [
@@ -109,12 +80,8 @@ function useContextVariables({
 
 	// Combine all variables
 	const allVariables = useMemo(
-		() => [
-			...processedDashboardVariables,
-			...globalVariables,
-			...customVariablesList,
-		],
-		[processedDashboardVariables, globalVariables, customVariablesList],
+		() => [...globalVariables, ...customVariablesList],
+		[globalVariables, customVariablesList],
 	);
 
 	// Create processed variables with truncation logic

frontend/src/hooks/dashboard/useDashboardVariables.ts

@@ -1,40 +0,0 @@
-import { useCallback, useRef, useSyncExternalStore } from 'react';
-import { dashboardVariablesStore } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStore';
-import {
-	IDashboardVariablesStoreState,
-	IUseDashboardVariablesReturn,
-} from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
-
-/**
- * Generic selector hook for dashboard variables store
- * Allows granular subscriptions to any part of the store state
- *
- * @example
- * ! Select top-level field
- * const variables = useDashboardVariablesSelector(s => s.variables);
- *
- * ! Select specific variable
- * const fooVar = useDashboardVariablesSelector(s => s.variables['foo']);
- *
- * ! Select derived value
- * const hasVariables = useDashboardVariablesSelector(s => Object.keys(s.variables).length > 0);
- */
-export const useDashboardVariablesSelector = <T>(
-	selector: (state: IDashboardVariablesStoreState) => T,
-): T => {
-	const selectorRef = useRef(selector);
-	selectorRef.current = selector;
-
-	const getSnapshot = useCallback(
-		() => selectorRef.current(dashboardVariablesStore.getSnapshot()),
-		[],
-	);
-
-	return useSyncExternalStore(dashboardVariablesStore.subscribe, getSnapshot);
-};
-
-export const useDashboardVariables = (): IUseDashboardVariablesReturn => {
-	const dashboardVariables = useDashboardVariablesSelector((s) => s.variables);
-
-	return { dashboardVariables };
-};

frontend/src/hooks/dashboard/useDashboardVariablesByType.ts

@@ -1,30 +0,0 @@
-import { useMemo } from 'react';
-import {
-	IDashboardVariable,
-	TVariableQueryType,
-} from 'types/api/dashboard/variables';
-
-import { useDashboardVariables } from './useDashboardVariables';
-
-export function useDashboardVariablesByType(
-	variableType: TVariableQueryType,
-	returnType: 'values',
-): IDashboardVariable[];
-export function useDashboardVariablesByType(
-	variableType: TVariableQueryType,
-	returnType?: 'entries',
-): [string, IDashboardVariable][];
-export function useDashboardVariablesByType(
-	variableType: TVariableQueryType,
-	returnType?: 'values' | 'entries',
-): IDashboardVariable[] | [string, IDashboardVariable][] {
-	const { dashboardVariables } = useDashboardVariables();
-
-	return useMemo(() => {
-		const entries = Object.entries(dashboardVariables || {}).filter(
-			(entry): entry is [string, IDashboardVariable] =>
-				Boolean(entry[1].name) && entry[1].type === variableType,
-		);
-		return returnType === 'values' ? entries.map(([, value]) => value) : entries;
-	}, [dashboardVariables, variableType, returnType]);
-}

frontend/src/hooks/dashboard/useDynamicVariableSuggestions.ts

@@ -0,0 +1,13 @@
+import {
+	DynamicVariableSuggestion,
+	useDynamicVariableSuggestionsStore,
+} from 'providers/Dashboard/store/dynamicVariableSuggestions';
+
+/**
+ * Dynamic variables published by the dashboard currently open, so the query
+ * builder can offer `$variable` as a value for the key each one backs. Empty on
+ * surfaces with no dashboard behind them (APM, Celery, messaging queues).
+ */
+export function useDynamicVariableSuggestions(): DynamicVariableSuggestion[] {
+	return useDynamicVariableSuggestionsStore((state) => state.suggestions);
+}

frontend/src/hooks/dashboard/useGetResolvedText.tsx

@@ -1,18 +1,8 @@
-// this hook is used to get the resolved text of a variable, lets say we have a text - "Logs count in $service.name in $severity and $service.name and $severity $service.name"
-// and the values of service.name and severity are "service1" and "error" respectively, then the resolved text should be "Logs count in service1 in error and service1 and error service1"
-// is case of the multiple variables value, make them comma separated
-// also have a prop saying max length post that you should truncate the text with "..."
-// return value should be a full text string, and a truncated text string (if max length is provided)
-
-import { ReactNode, useCallback, useMemo } from 'react';
-import { useDashboardVariables } from 'hooks/dashboard/useDashboardVariables';
+import { ReactNode, useMemo } from 'react';
 
 interface UseGetResolvedTextProps {
 	text: string | ReactNode;
-	variables?: Record<string, string | number | boolean>;
 	maxLength?: number;
-	matcher?: string;
-	maxValues?: number; // Maximum number of values to show before adding +n more
 }
 
 interface ResolvedTextResult {
@@ -20,173 +10,23 @@ interface ResolvedTextResult {
 	truncatedText: string | ReactNode;
 }
 
+/**
+ * Returns a panel title alongside a copy truncated to `maxLength`, so a card can
+ * show the short form and keep the full string for its tooltip. Non-string content
+ * passes through untouched.
+ */
 function useGetResolvedText({
 	text,
 	maxLength,
-	matcher = '$',
-	maxValues = 2, // Default to showing 2 values before +n more
 }: UseGetResolvedTextProps): ResolvedTextResult {
-	const { dashboardVariables } = useDashboardVariables();
-	const isString = typeof text === 'string';
-
-	const processedDashboardVariables = useMemo(() => {
-		return Object.entries(dashboardVariables).reduce<
-			Record<string, string | number | boolean>
-		>((acc, [, value]) => {
-			if (!value.name) {
-				return acc;
-			}
-
-			// Handle array values
-			if (Array.isArray(value.selectedValue)) {
-				acc[value.name] = value.selectedValue.join(', ');
-			} else if (value.selectedValue != null) {
-				acc[value.name] = value.selectedValue;
-			}
-			return acc;
-		}, {});
-	}, [dashboardVariables]);
-
-	// Process array values to add +n more notation for truncated text
-	const processedVariables = useMemo(() => {
-		const result: Record<string, string> = {};
-
-		Object.entries(processedDashboardVariables).forEach(([key, value]) => {
-			// If the value contains array data (comma-separated string), format it with +n more
-			if (
-				typeof value === 'string' &&
-				!value.includes('-|-') &&
-				value.includes(',')
-			) {
-				const values = value.split(',').map((v) => v.trim());
-				if (values.length > maxValues) {
-					const visibleValues = values.slice(0, maxValues);
-					const remainingCount = values.length - maxValues;
-					result[key] = `${visibleValues.join(
-						', ',
-					)} +${remainingCount}-|-${values.join(', ')}`;
-				} else {
-					result[key] = `${values.join(', ')}-|-${values.join(', ')}`;
-				}
-			} else {
-				// For values already formatted with -|- or non-array values
-				result[key] = String(value);
-			}
-		});
-
-		return result;
-	}, [processedDashboardVariables, maxValues]);
-
-	const combinedPattern = useMemo(() => {
-		const escapedMatcher = matcher.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
-		const variablePatterns = [
-			`\\{\\{\\s*?\\.([^\\s}]+?)\\s*?\\}\\}`, // {{.var}}
-			`\\{\\{\\s*([^\\s}]+?)\\s*\\}\\}`, // {{var}}
-			`${escapedMatcher}([^\\s.,;)\\]}>]+(?:\\.[^\\s.,;)\\]}>]+)*)`, // $var.name.path - allows dots but stops at punctuation
-			`\\[\\[\\s*([^\\s\\]]+?)\\s*\\]\\]`, // [[var]]
-		];
-		return new RegExp(variablePatterns.join('|'), 'g');
-	}, [matcher]);
-
-	const extractVarName = useCallback(
-		(match: string): string => {
-			// Extract variable name from different formats
-			const varNamePattern = '[a-zA-Z_\\-][a-zA-Z0-9_.\\-]*';
-			if (match.startsWith('{{')) {
-				const dotMatch = match.match(
-					new RegExp(`\\{\\{\\s*\\.(${varNamePattern})\\s*\\}\\}`),
-				);
-				if (dotMatch) {
-					return dotMatch[1].trim();
-				}
-				const normalMatch = match.match(
-					new RegExp(`\\{\\{\\s*(${varNamePattern})\\s*\\}\\}`),
-				);
-				if (normalMatch) {
-					return normalMatch[1].trim();
-				}
-			} else if (match.startsWith('[[')) {
-				const bracketMatch = match.match(
-					new RegExp(`\\[\\[\\s*(${varNamePattern})\\s*\\]\\]`),
-				);
-				if (bracketMatch) {
-					return bracketMatch[1].trim();
-				}
-			} else if (match.startsWith(matcher)) {
-				// For $ variables, we always want to strip the prefix
-				// unless the full match exists in processedVariables
-				const withoutPrefix = match.substring(matcher.length).trim();
-				const fullMatch = match.trim();
-
-				// If the full match (with prefix) exists, use it
-				if (processedVariables[fullMatch] !== undefined) {
-					return fullMatch;
-				}
-
-				// Otherwise return without prefix
-				return withoutPrefix;
-			}
-			return match;
-		},
-		[matcher, processedVariables],
-	);
-
-	const fullText = useMemo(() => {
-		if (!isString) {
-			return text;
-		}
-
-		return (text as string)?.replace(combinedPattern, (match) => {
-			const varName = extractVarName(match);
-			const value = processedVariables[varName];
-
-			if (value != null) {
-				const parts = value.split('-|-');
-				return parts.length > 1 ? parts[1] : value;
-			}
-			return match;
-		});
-	}, [text, processedVariables, combinedPattern, extractVarName, isString]);
-
 	const truncatedText = useMemo(() => {
-		if (!isString) {
+		if (typeof text !== 'string' || !maxLength || text.length <= maxLength) {
 			return text;
 		}
+		return `${text.substring(0, maxLength - 3)}...`;
+	}, [text, maxLength]);
 
-		const result = (text as string)?.replace(combinedPattern, (match) => {
-			const varName = extractVarName(match);
-			const value = processedVariables[varName];
-
-			if (value != null) {
-				const parts = value.split('-|-');
-				return parts[0] || value;
-			}
-			return match;
-		});
-
-		if (maxLength && result.length > maxLength) {
-			// For the specific test case
-			if (maxLength === 20 && result.startsWith('Logs count in')) {
-				return 'Logs count in test, a...';
-			}
-
-			// General case
-			return `${result.substring(0, maxLength - 3)}...`;
-		}
-		return result;
-	}, [
-		text,
-		processedVariables,
-		combinedPattern,
-		maxLength,
-		extractVarName,
-		isString,
-	]);
-
-	return {
-		fullText,
-		truncatedText,
-	};
+	return { fullText: text, truncatedText };
 }
 
 export default useGetResolvedText;

frontend/src/hooks/dashboard/useVariableFetchState.ts

@@ -1,151 +0,0 @@
-import { useCallback, useMemo, useRef, useSyncExternalStore } from 'react';
-import isEmpty from 'lodash-es/isEmpty';
-import {
-	IVariableFetchStoreState,
-	VariableFetchState,
-	variableFetchStore,
-} from 'providers/Dashboard/store/variableFetchStore';
-
-import { useDashboardVariablesSelector } from './useDashboardVariables';
-
-/**
- * Generic selector hook for the variable fetch store.
- * Same pattern as useDashboardVariablesSelector.
- */
-const useVariableFetchSelector = <T>(
-	selector: (state: IVariableFetchStoreState) => T,
-): T => {
-	const selectorRef = useRef(selector);
-	selectorRef.current = selector;
-
-	const getSnapshot = useCallback(
-		() => selectorRef.current(variableFetchStore.getSnapshot()),
-		[],
-	);
-
-	return useSyncExternalStore(variableFetchStore.subscribe, getSnapshot);
-};
-
-interface UseVariableFetchStateReturn {
-	/** The current fetch state for this variable */
-	variableFetchState: VariableFetchState;
-	/** Current fetch cycle — include in react-query keys to auto-cancel stale requests */
-	variableFetchCycleId: number;
-	/** True if this variable is idle (not waiting and not fetching) */
-	isVariableSettled: boolean;
-	/** True if this variable is actively fetching (loading or revalidating) */
-	isVariableFetching: boolean;
-	/** True if this variable has completed at least one fetch cycle */
-	hasVariableFetchedOnce: boolean;
-	/** True if any parent variable hasn't settled yet */
-	isVariableWaitingForDependencies: boolean;
-	/** Message describing what this variable is waiting on, or null if not waiting */
-	variableDependencyWaitMessage?: string;
-}
-
-/**
- * Per-variable hook that exposes the fetch state of a single variable.
- * Reusable by both variable input components and panel components.
- *
- * Subscribes to both variableFetchStore (for states) and
- * dashboardVariablesStore (for parent graph) to compute derived values.
- */
-export function useVariableFetchState(
-	variableName: string,
-): UseVariableFetchStateReturn {
-	// This variable's fetch state (loading, waiting, idle, etc.)
-	const variableFetchState = useVariableFetchSelector(
-		(s) => s.states[variableName] || 'idle',
-	) as VariableFetchState;
-
-	// All variable states — needed to check if parent variables are still in-flight
-	const allStates = useVariableFetchSelector((s) => s.states);
-
-	// Parent dependency graph — maps each variable to its direct parents
-	// e.g. { "childVariable": ["parentVariable"] } means "childVariable" depends on "parentVariable"
-	const parentGraph = useDashboardVariablesSelector(
-		(s) => s.dependencyData?.parentDependencyGraph,
-	);
-
-	// Timestamp of last successful fetch — 0 means never fetched
-	const lastUpdated = useVariableFetchSelector(
-		(s) => s.lastUpdated[variableName] || 0,
-	);
-
-	// Per-variable cycle counter — used as part of react-query keys
-	// so changing it auto-cancels stale requests for this variable only
-	const variableFetchCycleId = useVariableFetchSelector(
-		(s) => s.cycleIds[variableName] || 0,
-	);
-
-	const isVariableSettled = variableFetchState === 'idle';
-
-	const isVariableFetching =
-		variableFetchState === 'loading' || variableFetchState === 'revalidating';
-	// True after at least one successful fetch — used to show stale data while revalidating
-	const hasVariableFetchedOnce = lastUpdated > 0;
-
-	// Variable type — needed to differentiate waiting messages
-	const variableType = useDashboardVariablesSelector(
-		(s) => s.variableTypes[variableName],
-	);
-
-	// Parent variable names that haven't settled yet
-	const unsettledParents = useMemo(() => {
-		const parents = parentGraph?.[variableName] || [];
-		return parents.filter((p) => (allStates[p] || 'idle') !== 'idle');
-	}, [parentGraph, variableName, allStates]);
-
-	const isVariableWaitingForDependencies = unsettledParents.length > 0;
-
-	const variableDependencyWaitMessage = useMemo(() => {
-		if (variableFetchState !== 'waiting') {
-			return;
-		}
-
-		if (variableType === 'DYNAMIC') {
-			return 'Waiting for all query variable options to load.';
-		}
-
-		if (unsettledParents.length === 0) {
-			return;
-		}
-
-		const quoted = unsettledParents.map((p) => `"${p}"`);
-		const names =
-			quoted.length > 1
-				? `${quoted.slice(0, -1).join(', ')} and ${quoted[quoted.length - 1]}`
-				: quoted[0];
-		return `Waiting for options of ${names} to load.`;
-	}, [variableFetchState, variableType, unsettledParents]);
-
-	return {
-		variableFetchState,
-		isVariableSettled,
-		isVariableWaitingForDependencies,
-		variableDependencyWaitMessage,
-		isVariableFetching,
-		hasVariableFetchedOnce,
-		variableFetchCycleId,
-	};
-}
-
-export function useIsPanelWaitingOnVariable(variableNames: string[]): boolean {
-	const states = useVariableFetchSelector((s) => s.states);
-	const dashboardVariables = useDashboardVariablesSelector((s) => s.variables);
-
-	return variableNames.some((name) => {
-		const variableFetchState = states[name];
-		const variableData = Object.values(dashboardVariables).find(
-			(v) => v.name === name,
-		);
-		const { selectedValue } = variableData || {};
-
-		const isVariableInFetchingOrWaitingState =
-			variableFetchState === 'loading' ||
-			variableFetchState === 'revalidating' ||
-			variableFetchState === 'waiting';
-
-		return isEmpty(selectedValue) ? isVariableInFetchingOrWaitingState : false;
-	});
-}

frontend/src/hooks/queryBuilder/__tests__/useCreateAlerts.test.tsx

@@ -32,12 +32,8 @@ jest.mock(
 	}),
 );
 
-jest.mock('hooks/dashboard/useDashboardVariables', () => ({
-	useDashboardVariables: (): unknown => ({ dashboardVariables: {} }),
-}));
-
-jest.mock('hooks/dashboard/useDashboardVariablesByType', () => ({
-	useDashboardVariablesByType: (): unknown => ({}),
+jest.mock('hooks/dashboard/useDynamicVariableSuggestions', () => ({
+	useDynamicVariableSuggestions: (): unknown[] => [],
 }));
 
 jest.mock('hooks/useNotifications', () => ({
@@ -46,10 +42,6 @@ jest.mock('hooks/useNotifications', () => ({
 	}),
 }));
 
-jest.mock('lib/dashboardVariables/getDashboardVariables', () => ({
-	getDashboardVariables: (): unknown => ({}),
-}));
-
 jest.mock('utils/getGraphType', () => ({
 	getGraphType: jest.fn().mockReturnValue('time_series'),
 }));

frontend/src/hooks/queryBuilder/useCreateAlerts.tsx

@@ -11,10 +11,8 @@ import { ENTITY_VERSION_V5 } from 'constants/app';
 import { QueryParams } from 'constants/query';
 import ROUTES from 'constants/routes';
 import { MenuItemKeys } from 'container/WidgetCard/Header/contants';
-import { useDashboardVariables } from 'hooks/dashboard/useDashboardVariables';
-import { useDashboardVariablesByType } from 'hooks/dashboard/useDashboardVariablesByType';
+import { useDynamicVariableSuggestions } from 'hooks/dashboard/useDynamicVariableSuggestions';
 import { useNotifications } from 'hooks/useNotifications';
-import { getDashboardVariables } from 'lib/dashboardVariables/getDashboardVariables';
 import { mapQueryDataFromApi } from 'lib/newQueryBuilder/queryBuilderMappers/mapQueryDataFromApi';
 import { isEmpty } from 'lodash-es';
 import { AppState } from 'store/reducers';
@@ -38,11 +36,7 @@ const useCreateAlerts = (widget?: Widgets, caller?: string): VoidFunction => {
 
 	const { notifications } = useNotifications();
 
-	const { dashboardVariables } = useDashboardVariables();
-	const dashboardDynamicVariables = useDashboardVariablesByType(
-		'DYNAMIC',
-		'values',
-	);
+	const dashboardDynamicVariables = useDynamicVariableSuggestions();
 
 	return useCallback(() => {
 		if (!widget) {
@@ -63,15 +57,16 @@ const useCreateAlerts = (widget?: Widgets, caller?: string): VoidFunction => {
 				queryType: widget.query.queryType,
 			});
 		}
-		const { queryPayload } = prepareQueryRangePayloadV5({
-			query: widget.query,
-			globalSelectedInterval,
-			graphType: getGraphType(widget.panelTypes),
-			selectedTime: widget.timePreferance,
-			variables: getDashboardVariables(dashboardVariables),
-			originalGraphType: widget.panelTypes,
-			dynamicVariables: dashboardDynamicVariables,
-		});
+		const { queryPayload } = prepareQueryRangePayloadV5(
+			{
+				query: widget.query,
+				globalSelectedInterval,
+				graphType: getGraphType(widget.panelTypes),
+				selectedTime: widget.timePreferance,
+				originalGraphType: widget.panelTypes,
+			},
+			dashboardDynamicVariables,
+		);
 		queryRangeMutation.mutate(queryPayload, {
 			onSuccess: (data) => {
 				const updatedQuery = mapQueryDataFromApi(data.data.compositeQuery);
@@ -107,7 +102,6 @@ const useCreateAlerts = (widget?: Widgets, caller?: string): VoidFunction => {
 		globalSelectedInterval,
 		notifications,
 		queryRangeMutation,
-		dashboardVariables,
 		dashboardDynamicVariables,
 		widget,
 	]);

frontend/src/hooks/queryBuilder/useGetQueryRange.ts

@@ -5,7 +5,7 @@ import { PANEL_TYPES } from 'constants/queryBuilder';
 import { MAX_QUERY_RETRIES } from 'constants/reactQuery';
 import { REACT_QUERY_KEY } from 'constants/reactQueryKeys';
 import { updateBarStepInterval } from 'container/WidgetCard/utils';
-import { useDashboardVariablesByType } from 'hooks/dashboard/useDashboardVariablesByType';
+import { useDynamicVariableSuggestions } from 'hooks/dashboard/useDynamicVariableSuggestions';
 import {
 	GetMetricQueryRange,
 	GetQueryResultsProps,
@@ -33,10 +33,7 @@ export const useGetQueryRange: UseGetQueryRange = (
 	options,
 	headers,
 ) => {
-	const dashboardDynamicVariables = useDashboardVariablesByType(
-		'DYNAMIC',
-		'values',
-	);
+	const dashboardDynamicVariables = useDynamicVariableSuggestions();
 
 	const newRequestData: GetQueryResultsProps = useMemo(() => {
 		const firstQueryData = requestData.query.builder?.queryData[0];

frontend/src/lib/dashboard/getQueryResults.ts

@@ -17,8 +17,8 @@ import {
 import { Pagination } from 'hooks/queryPagination';
 import { convertNewDataToOld } from 'lib/newQueryBuilder/convertNewDataToOld';
 import { isEmpty } from 'lodash-es';
+import { DynamicVariableSuggestion } from 'providers/Dashboard/store/dynamicVariableSuggestions';
 import { SuccessResponseV2, Warning } from 'types/api';
-import { IDashboardVariable } from 'types/api/dashboard/variables';
 import { MetricQueryRangeSuccessResponse } from 'types/api/metrics/getQueryRange';
 import { IBuilderQuery, Query } from 'types/api/queryBuilder/queryBuilderData';
 import {
@@ -179,7 +179,7 @@ export const getLegend = (
 export async function GetMetricQueryRange(
 	props: GetQueryResultsProps,
 	version: string,
-	dynamicVariables?: IDashboardVariable[],
+	dynamicVariables: DynamicVariableSuggestion[] = [],
 	signal?: AbortSignal,
 	headers?: Record<string, string>,
 ): Promise<MetricQueryRangeSuccessResponse> {
@@ -226,10 +226,7 @@ export async function GetMetricQueryRange(
 	}
 
 	if (version === ENTITY_VERSION_V5) {
-		const v5Result = prepareQueryRangePayloadV5({
-			...props,
-			dynamicVariables,
-		});
+		const v5Result = prepareQueryRangePayloadV5(props, dynamicVariables);
 		legendMap = v5Result.legendMap;
 
 		// atleast one query should be there to make call to v5 api
@@ -364,5 +361,4 @@ export interface GetQueryResultsProps {
 	end?: number;
 	step?: number;
 	originalGraphType?: PANEL_TYPES;
-	dynamicVariables?: IDashboardVariable[];
 }

frontend/src/lib/dashboardVariables/dependencyGraph.ts

@@ -1,239 +0,0 @@
-import { textContainsVariableReference } from 'lib/dashboardVariables/variableReference';
-import { IDependencyData } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
-import { IDashboardVariable } from 'types/api/dashboard/variables';
-
-/**
- * Inter-variable dependency graph over the shared dashboard-variables store. A
- * QUERY variable "depends on" another when its query text references that
- * variable, so changing a value must refetch its dependents.
- *
- * Keyed on `IDashboardVariable`. The V2 editor has a parallel implementation
- * over its own flat form model in
- * `pages/DashboardPage/DashboardContainer/VariablesBar/utils/variableDependencies.ts`.
- */
-
-export type VariableGraph = Record<string, string[]>;
-
-/** Names of QUERY variables whose query references `variableName`. */
-const getDependentVariablesBasedOnVariableName = (
-	variableName: string,
-	variables: IDashboardVariable[],
-): string[] => {
-	if (!variables || !Array.isArray(variables)) {
-		return [];
-	}
-
-	return variables
-		.map((variable) => {
-			if (variable.type === 'QUERY') {
-				const queryValue = variable.queryValue || '';
-				if (textContainsVariableReference(queryValue, variableName)) {
-					return variable.name;
-				}
-			}
-			return null;
-		})
-		.filter((val): val is string => val !== null);
-};
-
-/** variable name → its direct dependents (children). */
-export const buildDependencies = (
-	variables: IDashboardVariable[],
-): VariableGraph => {
-	const graph: VariableGraph = {};
-
-	// Initialize empty arrays for all variables first
-	variables.forEach((variable) => {
-		if (variable.name) {
-			graph[variable.name] = [];
-		}
-	});
-
-	// For each QUERY variable, add it as a dependent to its referenced variables
-	variables.forEach((variable) => {
-		if (variable.name) {
-			const dependentVariables = getDependentVariablesBasedOnVariableName(
-				variable.name,
-				variables,
-			);
-
-			// For each referenced variable, add the current query as a dependent
-			graph[variable.name] = dependentVariables;
-		}
-	});
-
-	return graph;
-};
-
-/** Invert a child graph into a parent graph. */
-export const buildParentDependencyGraph = (
-	graph: VariableGraph,
-): VariableGraph => {
-	const parentGraph: VariableGraph = {};
-
-	// Initialize empty arrays for all nodes
-	Object.keys(graph).forEach((node) => {
-		parentGraph[node] = [];
-	});
-
-	// For each node and its children in the original graph
-	Object.entries(graph).forEach(([node, children]) => {
-		// For each child, add the current node as its parent
-		children.forEach((child) => {
-			if (!parentGraph[child]) {
-				parentGraph[child] = [];
-			}
-			parentGraph[child].push(node);
-		});
-	});
-
-	return parentGraph;
-};
-
-const collectCyclePath = (
-	graph: VariableGraph,
-	start: string,
-	end: string,
-): string[] => {
-	const path: string[] = [];
-	let current = start;
-
-	const findParent = (node: string): string | undefined =>
-		Object.keys(graph).find((key) => graph[key]?.includes(node));
-
-	while (current !== end) {
-		const parent = findParent(current);
-		if (!parent) {
-			break;
-		}
-		path.push(parent);
-		current = parent;
-	}
-
-	return [start, ...path];
-};
-
-const detectCycle = (
-	graph: VariableGraph,
-	node: string,
-	visited: Set<string>,
-	recStack: Set<string>,
-): string[] | null => {
-	if (!visited.has(node)) {
-		visited.add(node);
-		recStack.add(node);
-
-		const neighbors = graph[node] || [];
-		let cycleNodes: string[] | null = null;
-
-		neighbors.some((neighbor) => {
-			if (!visited.has(neighbor)) {
-				const foundCycle = detectCycle(graph, neighbor, visited, recStack);
-				if (foundCycle) {
-					cycleNodes = foundCycle;
-					return true;
-				}
-			} else if (recStack.has(neighbor)) {
-				// Found a cycle, collect the cycle nodes
-				cycleNodes = collectCyclePath(graph, node, neighbor);
-				return true;
-			}
-			return false;
-		});
-
-		if (cycleNodes) {
-			return cycleNodes;
-		}
-	}
-	recStack.delete(node);
-	return null;
-};
-
-/** Topological order, parent graph, transitive descendants and cycle info. */
-export const buildDependencyGraph = (
-	dependencies: VariableGraph,
-	// eslint-disable-next-line sonarjs/cognitive-complexity
-): IDependencyData => {
-	const inDegree: Record<string, number> = {};
-	const adjList: VariableGraph = {};
-
-	// Initialize in-degree and adjacency list
-	Object.keys(dependencies).forEach((node) => {
-		if (!inDegree[node]) {
-			inDegree[node] = 0;
-		}
-		if (!adjList[node]) {
-			adjList[node] = [];
-		}
-		dependencies[node]?.forEach((child) => {
-			if (!inDegree[child]) {
-				inDegree[child] = 0;
-			}
-			inDegree[child]++;
-			adjList[node].push(child);
-		});
-	});
-
-	// Detect cycles
-	const visited = new Set<string>();
-	const recStack = new Set<string>();
-	let cycleNodes: string[] | undefined;
-
-	Object.keys(dependencies).some((node) => {
-		if (!visited.has(node)) {
-			const foundCycle = detectCycle(dependencies, node, visited, recStack);
-			if (foundCycle) {
-				cycleNodes = foundCycle;
-				return true;
-			}
-		}
-		return false;
-	});
-
-	// Topological sort using Kahn's Algorithm
-	const queue: string[] = Object.keys(inDegree).filter(
-		(node) => inDegree[node] === 0,
-	);
-	const topologicalOrder: string[] = [];
-
-	while (queue.length > 0) {
-		const current = queue.shift();
-		if (current === undefined) {
-			break;
-		}
-		topologicalOrder.push(current);
-
-		adjList[current]?.forEach((neighbor) => {
-			inDegree[neighbor]--;
-			if (inDegree[neighbor] === 0) {
-				queue.push(neighbor);
-			}
-		});
-	}
-
-	const hasCycle = topologicalOrder.length !== Object.keys(dependencies)?.length;
-
-	// Pre-compute transitive descendants by walking topological order in reverse.
-	// Each node's transitive descendants = direct children + their transitive descendants.
-	const transitiveDescendants: VariableGraph = {};
-	for (let i = topologicalOrder.length - 1; i >= 0; i--) {
-		const node = topologicalOrder[i];
-		const desc = new Set<string>();
-		for (const child of adjList[node] || []) {
-			desc.add(child);
-			for (const d of transitiveDescendants[child] || []) {
-				desc.add(d);
-			}
-		}
-		transitiveDescendants[node] = Array.from(desc);
-	}
-
-	return {
-		order: topologicalOrder,
-		graph: adjList,
-		parentDependencyGraph: buildParentDependencyGraph(adjList),
-		transitiveDescendants,
-		hasCycle,
-		cycleNodes,
-	};
-};

frontend/src/lib/dashboardVariables/getDashboardVariables.ts

@@ -1,41 +0,0 @@
-import getStartEndRangeTime from 'lib/getStartEndRangeTime';
-import { IDashboardVariables } from 'providers/Dashboard/store/dashboardVariables/dashboardVariablesStoreTypes';
-import store from 'store';
-
-export const getDashboardVariables = (
-	variables?: IDashboardVariables,
-): Record<string, unknown> => {
-	if (!variables) {
-		return {};
-	}
-
-	try {
-		const { globalTime } = store.getState();
-		const { start, end } = getStartEndRangeTime({
-			type: 'GLOBAL_TIME',
-			interval: globalTime.selectedTime,
-		});
-
-		const variablesTuple: Record<string, unknown> = {
-			SIGNOZ_START_TIME: parseInt(start, 10) * 1e3,
-			SIGNOZ_END_TIME: parseInt(end, 10) * 1e3,
-		};
-
-		Object.entries(variables).forEach(([, value]) => {
-			if (value?.name) {
-				variablesTuple[value.name] =
-					value?.type === 'DYNAMIC' &&
-					value?.allSelected &&
-					value?.showALLOption &&
-					value?.multiSelect
-						? '__all__'
-						: value?.selectedValue;
-			}
-		});
-
-		return variablesTuple;
-	} catch (e) {
-		console.error(e);
-	}
-	return {};
-};

frontend/src/lib/uPlotV2/components/ColorBar/ColorBar.module.scss

@@ -0,0 +1,75 @@
+.container {
+	display: flex;
+	align-items: center;
+	gap: 8px;
+	width: 100%;
+	padding: 4px 12px 8px;
+	box-sizing: border-box;
+}
+
+.label {
+	flex: 0 0 auto;
+	font-size: 11px;
+	line-height: 16px;
+	color: var(--text-vanilla-400);
+	font-variant-numeric: tabular-nums;
+}
+
+.track {
+	position: relative;
+	flex: 1 1 auto;
+	height: 8px;
+	border-radius: 2px;
+	border: 1px solid var(--l2-border);
+}
+
+.marker {
+	position: absolute;
+	top: -3px;
+	bottom: -3px;
+	width: 2px;
+	transform: translateX(-1px);
+	background: var(--text-vanilla-100);
+	border-radius: 1px;
+}
+
+.caption {
+	flex: 0 0 auto;
+	font-size: 10px;
+	letter-spacing: 0.06em;
+	text-transform: uppercase;
+	color: var(--text-vanilla-400);
+}
+
+.keys {
+	display: flex;
+	flex: 0 0 auto;
+	gap: 12px;
+	align-items: center;
+}
+
+.key {
+	display: flex;
+	gap: 5px;
+	align-items: center;
+	font-size: 11px;
+	color: var(--text-vanilla-400);
+}
+
+.swatch,
+.hatchSwatch {
+	width: 11px;
+	height: 11px;
+	border-radius: 2px;
+	border: 1px solid var(--l2-border);
+	box-sizing: border-box;
+}
+
+// Approximates the canvas hatch painted over null cells.
+.hatchSwatch {
+	background-image: repeating-linear-gradient(
+		45deg,
+		transparent 0 2px,
+		var(--text-vanilla-400) 2px 3px
+	);
+}

frontend/src/lib/uPlotV2/components/ColorBar/ColorBar.tsx

@@ -0,0 +1,81 @@
+import { useMemo } from 'react';
+
+import Styles from './ColorBar.module.scss';
+
+export interface ColorBarProps {
+	/** Low to high, drawn as hard-edged segments so the bar shows the same set of
+	 *  colours as the cells. */
+	ramp: string[];
+	minLabel: string;
+	maxLabel: string;
+	/** 0..1. `null` hides the marker. */
+	markerPosition?: number | null;
+	/** What the colour encodes, e.g. "count". */
+	label?: string;
+	/** Keys for the two states a ramp cannot express: a hatched data gap, and a
+	 *  genuine zero at the bottom. Without them the difference is guesswork. */
+	showStateKeys?: boolean;
+	'data-testid'?: string;
+}
+
+/** What a colour means, plus a marker for the value under the cursor. */
+export default function ColorBar({
+	ramp,
+	minLabel,
+	maxLabel,
+	markerPosition = null,
+	label,
+	showStateKeys = true,
+	'data-testid': testId = 'color-bar',
+}: ColorBarProps): JSX.Element | null {
+	const gradient = useMemo(() => {
+		if (ramp.length === 0) {
+			return undefined;
+		}
+		if (ramp.length === 1) {
+			return ramp[0];
+		}
+		const stops = ramp.flatMap((color, index) => {
+			const from = (index / ramp.length) * 100;
+			const to = ((index + 1) / ramp.length) * 100;
+			return [`${color} ${from}%`, `${color} ${to}%`];
+		});
+		return `linear-gradient(to right, ${stops.join(', ')})`;
+	}, [ramp]);
+
+	if (gradient === undefined) {
+		return null;
+	}
+
+	const clampedMarker =
+		markerPosition === null ? null : Math.min(Math.max(markerPosition, 0), 1);
+
+	return (
+		<div className={Styles.container} data-testid={testId}>
+			{label && <span className={Styles.caption}>{label}</span>}
+			<span className={Styles.label}>{minLabel}</span>
+			<div className={Styles.track} style={{ background: gradient }}>
+				{clampedMarker !== null && (
+					<span
+						className={Styles.marker}
+						style={{ left: `${clampedMarker * 100}%` }}
+						data-testid={`${testId}-marker`}
+					/>
+				)}
+			</div>
+			<span className={Styles.label}>{maxLabel}</span>
+			{showStateKeys && (
+				<div className={Styles.keys} data-testid={`${testId}-state-keys`}>
+					<span className={Styles.key}>
+						<span className={Styles.hatchSwatch} />
+						no data
+					</span>
+					<span className={Styles.key}>
+						<span className={Styles.swatch} style={{ background: ramp[0] }} />
+						count 0
+					</span>
+				</div>
+			)}
+		</div>
+	);
+}

frontend/src/lib/uPlotV2/components/ColorBar/__tests__/ColorBar.test.tsx

@@ -0,0 +1,94 @@
+import { render, screen } from '@testing-library/react';
+
+import ColorBar from '../ColorBar';
+
+const RAMP = ['#111111', '#555555', '#999999', '#dddddd'];
+
+describe('ColorBar', () => {
+	it('renders the domain labels', () => {
+		render(<ColorBar ramp={RAMP} minLabel="0" maxLabel="1,204" />);
+
+		expect(screen.getByText('0')).toBeInTheDocument();
+		expect(screen.getByText('1,204')).toBeInTheDocument();
+	});
+
+	it('renders nothing without a ramp', () => {
+		const { container } = render(
+			<ColorBar ramp={[]} minLabel="0" maxLabel="0" />,
+		);
+
+		expect(container).toBeEmptyDOMElement();
+	});
+
+	it('hides the marker when nothing is hovered', () => {
+		render(<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" />);
+
+		expect(screen.queryByTestId('color-bar-marker')).not.toBeInTheDocument();
+	});
+
+	it('positions the marker at the hovered value', () => {
+		render(
+			<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" markerPosition={0.25} />,
+		);
+
+		expect(screen.getByTestId('color-bar-marker')).toHaveStyle({ left: '25%' });
+	});
+
+	it('clamps a marker outside the ramp to its ends', () => {
+		const { rerender } = render(
+			<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" markerPosition={-2} />,
+		);
+		expect(screen.getByTestId('color-bar-marker')).toHaveStyle({ left: '0%' });
+
+		rerender(
+			<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" markerPosition={4} />,
+		);
+		expect(screen.getByTestId('color-bar-marker')).toHaveStyle({ left: '100%' });
+	});
+
+	it('keys the two states a colour ramp cannot express', () => {
+		render(<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" />);
+
+		expect(screen.getByText('no data')).toBeInTheDocument();
+		expect(screen.getByText('count 0')).toBeInTheDocument();
+	});
+
+	it('draws the count-0 key with the bottom of the ramp', () => {
+		render(<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" />);
+
+		expect(screen.getByText('count 0').firstChild).toHaveStyle({
+			background: RAMP[0],
+		});
+	});
+
+	it('hides the state keys when asked', () => {
+		render(
+			<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" showStateKeys={false} />,
+		);
+
+		expect(screen.queryByText('no data')).not.toBeInTheDocument();
+	});
+
+	it('captions what the colour encodes', () => {
+		render(<ColorBar ramp={RAMP} minLabel="0" maxLabel="10" label="count" />);
+
+		expect(screen.getByText('count')).toBeInTheDocument();
+	});
+
+	it('renders hard-edged segments so the bar matches the drawn cells', () => {
+		render(
+			<ColorBar
+				ramp={['#111111', '#dddddd']}
+				minLabel="0"
+				maxLabel="10"
+				data-testid="scale"
+			/>,
+		);
+
+		const track = screen.getByTestId('scale').querySelector('div');
+		expect(track).toHaveStyle({
+			background:
+				'linear-gradient(to right, #111111 0%, #111111 50%, #dddddd 50%, #dddddd 100%)',
+		});
+	});
+});

frontend/src/lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/HeatmapBucketList.tsx

@@ -0,0 +1,29 @@
+import cx from 'classnames';
+
+import { formatCount, HeatmapBucketRow } from './heatmapTooltipContent';
+
+import Styles from './HeatmapTooltip.module.scss';
+
+/** The buckets either side of the hovered one, so a mode reads as a shape rather
+ *  than a single number. */
+export default function HeatmapBucketList({
+	rows,
+}: {
+	rows: HeatmapBucketRow[];
+}): JSX.Element {
+	return (
+		<div className={Styles.rows} data-testid="heatmap-tooltip-buckets">
+			{rows.map((row) => (
+				<div
+					key={row.label}
+					className={cx(Styles.row, { [Styles.rowHovered]: row.isHovered })}
+					data-hovered={row.isHovered}
+					data-testid="heatmap-tooltip-bucket-row"
+				>
+					<span className={Styles.rowLabel}>{row.label}</span>
+					<span className={Styles.rowValue}>{formatCount(row.count)}</span>
+				</div>
+			))}
+		</div>
+	);
+}

frontend/src/lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/HeatmapContributionList.tsx

@@ -0,0 +1,39 @@
+import {
+	formatCount,
+	formatPercent,
+	HeatmapContributionRow,
+} from './heatmapTooltipContent';
+
+import Styles from './HeatmapTooltip.module.scss';
+
+/** Only shown when the cell sums more than one group. */
+export default function HeatmapContributionList({
+	rows,
+	groupByLabel,
+}: {
+	rows: HeatmapContributionRow[];
+	/** The `groupBy` keys these rows are by. */
+	groupByLabel: string;
+}): JSX.Element {
+	return (
+		<div className={Styles.rows} data-testid="heatmap-tooltip-contribution">
+			{groupByLabel && <span className={Styles.section}>{groupByLabel}</span>}
+			{rows.map((row) => (
+				<div
+					key={row.label}
+					className={Styles.row}
+					data-testid="heatmap-tooltip-contribution-row"
+				>
+					<span
+						className={Styles.marker}
+						style={{ background: row.color }}
+						data-is-legend-marker={true}
+					/>
+					<span className={Styles.rowLabel}>{row.label}</span>
+					<span className={Styles.rowValue}>{formatCount(row.count)}</span>
+					<span className={Styles.rowPercent}>{formatPercent(row.percent)}</span>
+				</div>
+			))}
+		</div>
+	);
+}

frontend/src/lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/HeatmapTooltip.module.scss

@@ -0,0 +1,151 @@
+// Surface matches the shared Tooltip exactly — same tokens, same radius, no
+// shadow (the plugin's portal wrapper is transparent and paints nothing).
+//
+// Padding lives on the sections rather than here, also matching the shared
+// tooltip: TooltipFooter draws its own dashed top border, background and bottom
+// corner radius, so it has to reach the container edges.
+.container {
+	font-family: 'Inter';
+	font-size: 12px;
+	background: var(--l2-background);
+	-webkit-font-smoothing: antialiased;
+	color: var(--l2-foreground);
+	border-radius: 6px;
+	border: 1px solid var(--l2-border);
+	display: flex;
+	flex-direction: column;
+	min-width: 220px;
+
+	&.pinned {
+		border-color: var(--ring);
+	}
+}
+
+// Separates the cell identity from whichever question the second block answers.
+.divider {
+	display: block;
+	width: 100%;
+	height: 1px;
+	background-color: var(--l2-border);
+}
+
+.identity {
+	display: flex;
+	flex-direction: column;
+	gap: var(--spacing-2);
+	padding: var(--spacing-4) var(--spacing-4) var(--spacing-3);
+}
+
+.header {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	gap: var(--spacing-6);
+	font-size: 11px;
+	color: var(--text-vanilla-400);
+	font-variant-numeric: tabular-nums;
+}
+
+.filter {
+	display: flex;
+	align-items: center;
+	gap: 5px;
+	min-width: 0;
+}
+
+// Hollow ring, matching the legend's unselected marker — this names the filter the
+// grid is under, it is not a colour key.
+.filterMarker {
+	width: 9px;
+	height: 9px;
+	border-radius: 50%;
+	border: 2px solid currentColor;
+	flex-shrink: 0;
+}
+
+.filterLabel {
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.title {
+	display: flex;
+	align-items: baseline;
+	justify-content: space-between;
+	gap: var(--spacing-8);
+}
+
+.titleBucket {
+	font-size: 13px;
+	font-weight: 600;
+	color: var(--text-vanilla-100);
+}
+
+.titleCount {
+	font-size: 13px;
+	font-weight: 600;
+	color: var(--text-vanilla-100);
+	font-variant-numeric: tabular-nums;
+}
+
+.rows {
+	display: flex;
+	flex-direction: column;
+	gap: var(--spacing-1);
+	padding: var(--spacing-3) var(--spacing-4);
+}
+
+.section {
+	font-size: 10px;
+	letter-spacing: 0.06em;
+	text-transform: uppercase;
+	color: var(--text-vanilla-400);
+	padding: 0 var(--spacing-2) var(--spacing-1);
+}
+
+.row {
+	display: flex;
+	align-items: center;
+	gap: var(--spacing-4);
+	padding: var(--spacing-1) var(--spacing-2);
+	border-radius: 3px;
+	font-size: 12px;
+	color: var(--text-vanilla-400);
+	font-variant-numeric: tabular-nums;
+}
+
+// The hovered bucket is the one the cursor is on; lift it out of the neighbours.
+.rowHovered {
+	background: var(--l3-background);
+	color: var(--text-vanilla-100);
+	font-weight: 500;
+}
+
+.rowLabel {
+	flex: 1;
+	min-width: 0;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.rowValue {
+	flex: 0 0 auto;
+	text-align: right;
+}
+
+.rowPercent {
+	flex: 0 0 auto;
+	min-width: 40px;
+	text-align: right;
+	color: var(--text-vanilla-400);
+	opacity: 0.75;
+}
+
+.marker {
+	width: 8px;
+	height: 8px;
+	border-radius: 50%;
+	flex-shrink: 0;
+}

frontend/src/lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/HeatmapTooltip.tsx

@@ -0,0 +1,181 @@
+import { useMemo } from 'react';
+import cx from 'classnames';
+import {
+	resolveColumnIndex,
+	resolveRowIndex,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import { useTimezone } from 'providers/Timezone';
+
+import { HeatmapTooltipProps } from '../../../types';
+import HeatmapBucketList from './HeatmapBucketList';
+import HeatmapContributionList from './HeatmapContributionList';
+import {
+	buildBucketRows,
+	buildContributionRows,
+	formatBucketLabel,
+	formatColumnRange,
+	formatCount,
+	formatGroupFilter,
+	HeatmapTooltipBody,
+	resolveGroupByLabel,
+	resolveTooltipBody,
+} from './heatmapTooltipContent';
+
+import Styles from './HeatmapTooltip.module.scss';
+
+/**
+ * The cell identity is the same in every state; the second block answers whichever
+ * question the panel state leaves open (see `resolveTooltipBody`). Purpose-built
+ * rather than composed from the shared `Tooltip`, which renders a flat list of
+ * series values — none of these states is that shape.
+ *
+ * The cell comes from the live cursor, not a prop: uPlot's `cursor.idx` snaps to
+ * the nearest timestamp, so half of every column would report its neighbour.
+ */
+export default function HeatmapTooltip({
+	uPlotInstance,
+	yAxis,
+	step,
+	series,
+	visibleGroups,
+	groupColor,
+	yAxisUnit,
+	decimalPrecision,
+	timezone,
+	isPinned,
+	dismiss,
+	renderTooltipFooter,
+}: HeatmapTooltipProps): JSX.Element | null {
+	const { timezone: userTimezone } = useTimezone();
+	const resolvedTimezone = timezone?.value ?? userTimezone.value;
+
+	// Read outside the memo: uPlot mutates the same instance on every move, so
+	// keying off the instance alone would freeze the cell.
+	const { left = -10, top = -10 } = uPlotInstance.cursor;
+
+	const cell = useMemo(() => {
+		if (left < 0 || top < 0) {
+			return null;
+		}
+		const timestamps = uPlotInstance.data[0] as ArrayLike<number>;
+		const column = resolveColumnIndex(
+			timestamps,
+			uPlotInstance.posToVal(left, 'x'),
+			step,
+		);
+		const row = resolveRowIndex(yAxis.edges, uPlotInstance.posToVal(top, 'y'));
+		if (column === null || row === null) {
+			return null;
+		}
+		return {
+			row,
+			column,
+			timestamp: timestamps[column],
+			count:
+				(uPlotInstance.data[row + 1] as Array<number | null> | undefined)?.[
+					column
+				] ?? null,
+		};
+	}, [left, top, uPlotInstance, yAxis, step]);
+
+	// The cell sums the enabled groups, so those are what a breakdown must cover.
+	const visible = useMemo(
+		() => series.filter((entry) => visibleGroups.includes(entry.label)),
+		[series, visibleGroups],
+	);
+	const body = resolveTooltipBody(visible.length);
+
+	const bucketRows = useMemo(() => {
+		if (!cell || body !== HeatmapTooltipBody.Buckets) {
+			return [];
+		}
+		return buildBucketRows({
+			counts: uPlotInstance.data.slice(1) as Array<
+				ArrayLike<number | null> | undefined
+			>,
+			yAxis,
+			row: cell.row,
+			column: cell.column,
+			yAxisUnit,
+			decimalPrecision,
+		});
+	}, [cell, body, uPlotInstance, yAxis, yAxisUnit, decimalPrecision]);
+
+	const contributionRows = useMemo(() => {
+		if (!cell || body !== HeatmapTooltipBody.Contribution) {
+			return [];
+		}
+		return buildContributionRows({
+			series: visible,
+			timestamp: cell.timestamp,
+			row: cell.row,
+			color: groupColor,
+		});
+	}, [cell, body, visible, groupColor]);
+
+	if (!cell) {
+		return null;
+	}
+
+	// A single enabled group out of several means the legend has isolated it.
+	const isolated =
+		series.length > 1 && visible.length === 1 ? visible[0] : undefined;
+	const filterLabel = formatGroupFilter(isolated);
+
+	return (
+		<div
+			className={cx(Styles.container, { [Styles.pinned]: isPinned })}
+			data-pinned={isPinned}
+			data-testid="heatmap-tooltip"
+		>
+			<div className={Styles.identity}>
+				<div className={Styles.header}>
+					<span data-testid="heatmap-tooltip-range">
+						{formatColumnRange({
+							start: cell.timestamp,
+							step,
+							timezone: resolvedTimezone,
+						})}
+					</span>
+					{filterLabel && (
+						<span
+							className={Styles.filter}
+							style={{ color: groupColor }}
+							data-testid="heatmap-tooltip-filter"
+						>
+							<span className={Styles.filterMarker} />
+							<span className={Styles.filterLabel}>{filterLabel}</span>
+						</span>
+					)}
+				</div>
+
+				<div className={Styles.title}>
+					<span className={Styles.titleBucket} data-testid="heatmap-tooltip-bucket">
+						{formatBucketLabel({
+							yAxis,
+							row: cell.row,
+							yAxisUnit,
+							decimalPrecision,
+						})}
+					</span>
+					<span className={Styles.titleCount} data-testid="heatmap-tooltip-count">
+						{formatCount(cell.count)}
+					</span>
+				</div>
+			</div>
+
+			<span className={Styles.divider} data-testid="heatmap-tooltip-divider" />
+
+			{body === HeatmapTooltipBody.Contribution ? (
+				<HeatmapContributionList
+					rows={contributionRows}
+					groupByLabel={resolveGroupByLabel(series)}
+				/>
+			) : (
+				<HeatmapBucketList rows={bucketRows} />
+			)}
+
+			{renderTooltipFooter?.({ isPinned, dismiss })}
+		</div>
+	);
+}

frontend/src/lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/__tests__/HeatmapTooltip.test.tsx

@@ -0,0 +1,289 @@
+import { resolveHeatmapYAxis } from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import {
+	HeatmapAxisScale,
+	HeatmapSeries,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+import { render, RenderResult, screen } from 'tests/test-utils';
+import type uPlot from 'uplot';
+
+import HeatmapTooltip from '../HeatmapTooltip';
+
+const BOUNDS = [100, 500, 1000, 2500];
+const Y_AXIS = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Log);
+const TIMESTAMPS = [1_700_000_000, 1_700_000_300];
+const STEP = 300;
+const PLOT_SIZE = 500;
+const ROW_COUNT = BOUNDS.length + 1;
+
+/** Row 2 is the 500ms–1s bucket the design mock hovers. */
+const HOVERED_ROW = 2;
+
+function seriesFor(
+	group: string,
+	countsAtHoveredRow: [number, number],
+): HeatmapSeries {
+	return {
+		label: `service.name=${group}`,
+		labels: [{ key: 'service.name', value: group }],
+		points: TIMESTAMPS.map((timestamp, column) => ({
+			timestamp,
+			counts: Array.from({ length: ROW_COUNT }, (_, row) =>
+				row === HOVERED_ROW ? countsAtHoveredRow[column] : row * 10,
+			),
+		})),
+	};
+}
+
+const GROUPED: HeatmapSeries[] = [
+	seriesFor('checkout', [355, 300]),
+	seriesFor('frontend', [86, 80]),
+	seriesFor('cart', [14, 10]),
+	seriesFor('payments', [0, 0]),
+];
+
+/** Grid counts, matching what the renderer would have been handed. */
+function gridData(rowTotals: number[]): uPlot.AlignedData {
+	return [
+		TIMESTAMPS,
+		...Array.from({ length: ROW_COUNT }, (_, row) => [
+			rowTotals[row] ?? row * 40,
+			rowTotals[row] ?? row * 40,
+		]),
+	] as unknown as uPlot.AlignedData;
+}
+
+// Totals chosen to match the mock: 2 / 92 / 455 / 269 / 10 bottom-up.
+const ROW_TOTALS = [10, 269, 455, 92, 2];
+
+function createFakePlot(): uPlot {
+	const xSpan = TIMESTAMPS[TIMESTAMPS.length - 1] + STEP - TIMESTAMPS[0];
+	const ySpan = Y_AXIS.max - Y_AXIS.min;
+	// Aim the cursor at the middle of the hovered row, first column.
+	const rowMid = (Y_AXIS.edges[HOVERED_ROW] + Y_AXIS.edges[HOVERED_ROW + 1]) / 2;
+	const top = PLOT_SIZE * (1 - (rowMid - Y_AXIS.min) / ySpan);
+
+	return {
+		data: gridData(ROW_TOTALS),
+		cursor: { left: PLOT_SIZE * 0.25, top },
+		posToVal: (pos: number, scaleKey: string): number =>
+			scaleKey === 'x'
+				? TIMESTAMPS[0] + (pos / PLOT_SIZE) * xSpan
+				: Y_AXIS.min + ((PLOT_SIZE - pos) / PLOT_SIZE) * ySpan,
+	} as unknown as uPlot;
+}
+
+function renderTooltip(
+	overrides: Partial<React.ComponentProps<typeof HeatmapTooltip>> = {},
+): RenderResult {
+	return render(
+		<HeatmapTooltip
+			id="panel-1"
+			uPlotInstance={createFakePlot()}
+			dataIndexes={[]}
+			seriesIndex={null}
+			isPinned={false}
+			dismiss={jest.fn()}
+			viaSync={false}
+			yAxis={Y_AXIS}
+			step={STEP}
+			series={GROUPED}
+			visibleGroups={GROUPED.map((entry) => entry.label)}
+			groupColor="#fcfdbf"
+			yAxisUnit="ms"
+			{...overrides}
+		/>,
+	);
+}
+
+describe('HeatmapTooltip — cell identity', () => {
+	it('heads with the time span the column covers, not a single instant', () => {
+		renderTooltip();
+
+		expect(screen.getByTestId('heatmap-tooltip-range').textContent).toMatch(
+			/^\d{2}:\d{2} → \d{2}:\d{2}$/,
+		);
+	});
+
+	it('names the hovered bucket and its count', () => {
+		renderTooltip();
+
+		expect(screen.getByTestId('heatmap-tooltip-bucket')).toHaveTextContent(
+			'500 ms – 1 s',
+		);
+		expect(screen.getByTestId('heatmap-tooltip-count')).toHaveTextContent('455');
+	});
+
+	it('marks the surface as pinned so the border picks up the ring', () => {
+		renderTooltip({ isPinned: true });
+
+		expect(screen.getByTestId('heatmap-tooltip')).toHaveAttribute(
+			'data-pinned',
+			'true',
+		);
+	});
+
+	it('is unpinned by default', () => {
+		renderTooltip();
+
+		expect(screen.getByTestId('heatmap-tooltip')).toHaveAttribute(
+			'data-pinned',
+			'false',
+		);
+	});
+
+	it('separates the cell identity from the block below it', () => {
+		renderTooltip();
+
+		expect(screen.getByTestId('heatmap-tooltip-divider')).toBeInTheDocument();
+	});
+
+	it('renders a footer when the panel supplies one', () => {
+		renderTooltip({
+			renderTooltipFooter: ({ isPinned }): JSX.Element => (
+				<div data-testid="footer">{isPinned ? 'pinned' : 'press P'}</div>
+			),
+		});
+
+		expect(screen.getByTestId('footer')).toHaveTextContent('press P');
+	});
+
+	it('tells the footer when the tooltip is pinned', () => {
+		renderTooltip({
+			isPinned: true,
+			renderTooltipFooter: ({ isPinned }): JSX.Element => (
+				<div data-testid="footer">{isPinned ? 'pinned' : 'press P'}</div>
+			),
+		});
+
+		expect(screen.getByTestId('footer')).toHaveTextContent('pinned');
+	});
+
+	it('renders nothing when the cursor is off the plot', () => {
+		const plot = createFakePlot();
+		(plot as { cursor: unknown }).cursor = { left: -10, top: -10 };
+
+		const { container } = renderTooltip({ uPlotInstance: plot });
+
+		expect(container).toBeEmptyDOMElement();
+	});
+});
+
+describe('HeatmapTooltip — grouped, nothing selected', () => {
+	it('breaks the cell down by group instead of showing neighbours', () => {
+		renderTooltip();
+
+		expect(
+			screen.getByTestId('heatmap-tooltip-contribution'),
+		).toBeInTheDocument();
+		expect(
+			screen.queryByTestId('heatmap-tooltip-buckets'),
+		).not.toBeInTheDocument();
+	});
+
+	it('heads the breakdown with the groupBy key', () => {
+		renderTooltip();
+
+		expect(screen.getByText('service.name')).toBeInTheDocument();
+	});
+
+	it('names each row by value alone and orders by contribution', () => {
+		renderTooltip();
+
+		const rows = screen
+			.getAllByTestId('heatmap-tooltip-contribution-row')
+			.map((row) => row.textContent);
+
+		expect(rows[0]).toContain('checkout');
+		expect(rows[0]).toContain('355');
+		expect(rows[1]).toContain('frontend');
+		expect(rows[2]).toContain('cart');
+	});
+
+	it('shows each group"s share of the cell', () => {
+		renderTooltip();
+
+		const rows = screen.getAllByTestId('heatmap-tooltip-contribution-row');
+		// 355 / 455 = 78%, 86 / 455 = 19%, 14 / 455 = 3.1%
+		expect(rows[0]).toHaveTextContent('78%');
+		expect(rows[1]).toHaveTextContent('19%');
+		expect(rows[2]).toHaveTextContent('3.1%');
+	});
+
+	it('still lists a group that contributed nothing', () => {
+		renderTooltip();
+
+		const rows = screen.getAllByTestId('heatmap-tooltip-contribution-row');
+		expect(rows).toHaveLength(GROUPED.length);
+		expect(rows[3]).toHaveTextContent('payments');
+		expect(rows[3]).toHaveTextContent('0.0%');
+	});
+
+	it('does not name a filter when every group is enabled', () => {
+		renderTooltip();
+
+		expect(
+			screen.queryByTestId('heatmap-tooltip-filter'),
+		).not.toBeInTheDocument();
+	});
+});
+
+describe('HeatmapTooltip — grouped, one enabled', () => {
+	const selected = { visibleGroups: ['service.name=checkout'] };
+
+	it('returns to neighbouring buckets, since contribution is already answered', () => {
+		renderTooltip(selected);
+
+		expect(screen.getByTestId('heatmap-tooltip-buckets')).toBeInTheDocument();
+		expect(
+			screen.queryByTestId('heatmap-tooltip-contribution'),
+		).not.toBeInTheDocument();
+	});
+
+	it('names the active filter', () => {
+		renderTooltip(selected);
+
+		expect(screen.getByTestId('heatmap-tooltip-filter')).toHaveTextContent(
+			'service.name = checkout',
+		);
+	});
+});
+
+describe('HeatmapTooltip — no grouping', () => {
+	const ungrouped = {
+		series: [{ label: '', points: GROUPED[0].points }],
+		visibleGroups: [''],
+	};
+
+	it('shows neighbouring buckets, highest first', () => {
+		renderTooltip(ungrouped);
+
+		const rows = screen
+			.getAllByTestId('heatmap-tooltip-bucket-row')
+			.map((row) => row.textContent);
+
+		// Two buckets either side of 500ms – 1s, reading down the y axis.
+		expect(rows).toHaveLength(5);
+		expect(rows[0]).toContain('> 2.5 s');
+		expect(rows[2]).toContain('500 ms – 1 s');
+		expect(rows[4]).toContain('≤ 100 ms');
+	});
+
+	it('marks the hovered bucket among its neighbours', () => {
+		renderTooltip(ungrouped);
+
+		const hovered = screen
+			.getAllByTestId('heatmap-tooltip-bucket-row')
+			.filter((row) => row.dataset.hovered === 'true');
+
+		expect(hovered).toHaveLength(1);
+		expect(hovered[0]).toHaveTextContent('500 ms – 1 s');
+	});
+
+	it('never breaks down a single series', () => {
+		renderTooltip(ungrouped);
+
+		expect(
+			screen.queryByTestId('heatmap-tooltip-contribution'),
+		).not.toBeInTheDocument();
+	});
+});

frontend/src/lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/heatmapTooltipContent.ts

@@ -0,0 +1,199 @@
+import { PrecisionOption } from 'components/Graph/types';
+import { getToolTipValue } from 'components/Graph/yAxisConfig';
+import { DATE_TIME_FORMATS } from 'constants/dateTimeFormats';
+import dayjs from 'dayjs';
+import { formatRowLabel } from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import {
+	HeatmapSeries,
+	HeatmapYAxis,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+
+/** Rows shown either side of the hovered one. */
+const NEIGHBOUR_SPAN = 2;
+/** Below this share a percentage needs a decimal to stay informative. */
+const PERCENT_DECIMAL_THRESHOLD = 10;
+/** Below this, the header needs seconds to distinguish columns. */
+const SUB_MINUTE_STEP = 60;
+
+export const NO_DATA_LABEL = 'no data';
+
+/**
+ * Which question the second block answers. A cell summed across several groups begs
+ * "which group?"; a cell that is already one series begs "how does this bucket
+ * compare with its neighbours?".
+ */
+export enum HeatmapTooltipBody {
+	Buckets = 'buckets',
+	Contribution = 'contribution',
+}
+
+export interface HeatmapBucketRow {
+	label: string;
+	count: number | null;
+	isHovered: boolean;
+}
+
+export interface HeatmapContributionRow {
+	label: string;
+	color: string;
+	count: number;
+	/** Share of the cell's total, 0..100. */
+	percent: number;
+}
+
+export function resolveTooltipBody(visibleCount: number): HeatmapTooltipBody {
+	// One enabled group contributes the whole cell, so there is nothing to break
+	// down — whether the query is ungrouped or the legend has isolated a group.
+	return visibleCount > 1
+		? HeatmapTooltipBody.Contribution
+		: HeatmapTooltipBody.Buckets;
+}
+
+/** A cell is an interval, so a single instant would misreport which observations
+ *  it contains. The date is left to the x axis directly below. */
+export function formatColumnRange({
+	start,
+	step,
+	timezone,
+}: {
+	/** Column start, in seconds. */
+	start: number;
+	/** Column width, in seconds. */
+	step: number;
+	timezone: string;
+}): string {
+	const format =
+		step < SUB_MINUTE_STEP
+			? DATE_TIME_FORMATS.TIME_SECONDS
+			: DATE_TIME_FORMATS.TIME;
+	const from = dayjs(start * 1000).tz(timezone);
+	const to = dayjs((start + step) * 1000).tz(timezone);
+	return `${from.format(format)} → ${to.format(format)}`;
+}
+
+/** Formatted with the panel's unit. */
+export function formatBucketLabel({
+	yAxis,
+	row,
+	yAxisUnit,
+	decimalPrecision,
+}: {
+	yAxis: HeatmapYAxis;
+	row: number;
+	yAxisUnit?: string;
+	decimalPrecision?: PrecisionOption;
+}): string {
+	const bucket = yAxis.rows[row];
+	if (!bucket) {
+		return '';
+	}
+	return formatRowLabel(bucket, (value) =>
+		getToolTipValue(String(value), yAxisUnit, decimalPrecision),
+	);
+}
+
+export function formatCount(count: number | null): string {
+	return count === null ? NO_DATA_LABEL : count.toLocaleString();
+}
+
+export function formatPercent(percent: number): string {
+	return percent >= PERCENT_DECIMAL_THRESHOLD
+		? `${Math.round(percent)}%`
+		: `${percent.toFixed(1)}%`;
+}
+
+/** Names the group the grid is currently isolated to. */
+export function formatGroupFilter(series: HeatmapSeries | undefined): string {
+	if (!series) {
+		return '';
+	}
+	if (!series.labels?.length) {
+		return series.label;
+	}
+	return series.labels
+		.map((label) => `${label.key} = ${label.value}`)
+		.join(', ');
+}
+
+/** The `groupBy` keys the breakdown is by. */
+export function resolveGroupByLabel(series: HeatmapSeries[]): string {
+	const keys = series[0]?.labels?.map((label) => label.key) ?? [];
+	return keys.join(', ');
+}
+
+function formatSeriesValue(series: HeatmapSeries): string {
+	if (!series.labels?.length) {
+		return series.label;
+	}
+	return series.labels.map((label) => label.value).join(', ');
+}
+
+/** Highest first, so the list reads in the same direction as the y axis. */
+export function buildBucketRows({
+	counts,
+	yAxis,
+	row,
+	column,
+	yAxisUnit,
+	decimalPrecision,
+}: {
+	/** Row-major, as the renderer draws them. */
+	counts: Array<ArrayLike<number | null> | undefined>;
+	yAxis: HeatmapYAxis;
+	row: number;
+	column: number;
+	yAxisUnit?: string;
+	decimalPrecision?: PrecisionOption;
+}): HeatmapBucketRow[] {
+	const formatBucketValue = (value: number): string =>
+		getToolTipValue(String(value), yAxisUnit, decimalPrecision);
+
+	const rows: HeatmapBucketRow[] = [];
+	for (let offset = NEIGHBOUR_SPAN; offset >= -NEIGHBOUR_SPAN; offset -= 1) {
+		const index = row + offset;
+		const bucket = yAxis.rows[index];
+		if (!bucket) {
+			continue;
+		}
+		rows.push({
+			label: formatRowLabel(bucket, formatBucketValue),
+			count: counts[index]?.[column] ?? null,
+			isHovered: offset === 0,
+		});
+	}
+	return rows;
+}
+
+/**
+ * Largest first. Groups that contributed nothing are still listed — that is an
+ * answer, and dropping the row makes the list look truncated.
+ */
+export function buildContributionRows({
+	series,
+	timestamp,
+	row,
+	color,
+}: {
+	/** Only the groups the legend has enabled — they are what the cell sums. */
+	series: HeatmapSeries[];
+	/** Column start, in seconds. */
+	timestamp: number;
+	row: number;
+	color: string;
+}): HeatmapContributionRow[] {
+	const counts = series.map((entry) => {
+		const point = entry.points.find((item) => item.timestamp === timestamp);
+		// Absent or null contributed nothing to the sum, which is what this breaks down.
+		return point?.counts[row] ?? 0;
+	});
+	const total = counts.reduce((sum, count) => sum + count, 0);
+
+	return series
+		.map((entry, index) => ({
+			label: formatSeriesValue(entry),
+			color,
+			count: counts[index],
+			percent: total > 0 ? (counts[index] / total) * 100 : 0,
+		}))
+		.sort((a, b) => b.count - a.count);
+}

frontend/src/lib/uPlotV2/components/types.ts

@@ -5,6 +5,7 @@ import uPlot from 'uplot';
 
 import { UPlotConfigBuilder } from '../config/UPlotConfigBuilder';
 import { LegendItem } from '../config/types';
+import { HeatmapSeries, HeatmapYAxis } from '../plugins/HeatmapPlugin/types';
 import { SyncTooltipFilterMode } from '../plugins/TooltipPlugin/types';
 
 /**
@@ -103,6 +104,21 @@ export interface BarTooltipProps extends BaseTooltipProps, TooltipRenderArgs {
 export interface HistogramTooltipProps
 	extends BaseTooltipProps, TooltipRenderArgs {}
 
+/** Not part of `TooltipProps`: it renders its own container, since none of its
+ *  states is the flat series list the shared `Tooltip` draws. */
+export interface HeatmapTooltipProps
+	extends BaseTooltipProps, TooltipRenderArgs {
+	yAxis: HeatmapYAxis;
+	/** Column width in seconds. */
+	step: number;
+	/** Needed to break a summed cell down by contribution. */
+	series: HeatmapSeries[];
+	/** Groups the legend has enabled; the cell sums exactly these. */
+	visibleGroups: string[];
+	/** Same colour the legend and the densest cells use. */
+	groupColor: string;
+}
+
 export type TooltipProps =
 	| TimeSeriesTooltipProps
 	| BarTooltipProps

frontend/src/lib/uPlotV2/config/UPlotAxisBuilder.ts

@@ -1,5 +1,4 @@
 import { getToolTipValue } from 'components/Graph/yAxisConfig';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import uPlot, { Axis } from 'uplot';
 
 import { uPlotXAxisValuesFormat } from '../../uPlotLib/utils/constants';
@@ -7,11 +6,6 @@ import getGridColor from '../../uPlotLib/utils/getGridColor';
 import { buildYAxisSizeCalculator } from '../utils/axis';
 import { AxisProps, ConfigBuilder } from './types';
 
-const PANEL_TYPES_WITH_X_AXIS_DATETIME_FORMAT = [
-	PANEL_TYPES.TIME_SERIES,
-	PANEL_TYPES.BAR,
-];
-
 /**
  * Builder for uPlot axis configuration
  * Handles creation and merging of axis settings
@@ -67,12 +61,9 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 	 * Build values formatter for X-axis (time)
 	 */
 	private buildXAxisValuesFormatter(): uPlot.Axis.Values | undefined {
-		const { panelType } = this.props;
+		const { isTimeAxis } = this.props;
 
-		if (
-			panelType &&
-			PANEL_TYPES_WITH_X_AXIS_DATETIME_FORMAT.includes(panelType)
-		) {
+		if (isTimeAxis) {
 			return uPlotXAxisValuesFormat as uPlot.Axis.Values;
 		}
 
@@ -157,6 +148,7 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 			show = true,
 			side = 2, // bottom by default
 			space,
+			splits,
 			gap = 5, // default gap is 5
 		} = this.props;
 
@@ -188,6 +180,9 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 		if (values) {
 			axisConfig.values = values;
 		}
+		if (splits) {
+			axisConfig.splits = splits;
+		}
 		if (gap !== undefined) {
 			axisConfig.gap = gap;
 		}

frontend/src/lib/uPlotV2/config/UPlotScaleBuilder.ts

@@ -46,6 +46,13 @@ export class UPlotScaleBuilder extends ConfigBuilder<
 
 		// Special handling for time scales (X axis)
 		if (time) {
+			// An explicit range wins: the alignment below trims the tail of the window
+			// to whole minutes, which is right for point-based series but drops the
+			// final column of any chart whose marks span an interval.
+			if (range) {
+				return { [scaleKey]: { time: true, auto: false, range } };
+			}
+
 			let minTime = this.min ?? 0;
 			let maxTime = this.max ?? 0;
 

frontend/src/lib/uPlotV2/config/__tests__/UPlotAxisBuilder.test.ts

@@ -1,5 +1,4 @@
 import { getToolTipValue } from 'components/Graph/yAxisConfig';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import { uPlotXAxisValuesFormat } from 'lib/uPlotLib/utils/constants';
 import type uPlot from 'uplot';
 
@@ -137,11 +136,11 @@ describe('UPlotAxisBuilder', () => {
 		});
 	});
 
-	it('uses time-based X-axis values formatter for time-series like panels', () => {
+	it('uses time-based X-axis values formatter when the caller declares a time axis', () => {
 		const builder = new UPlotAxisBuilder(
 			createAxisProps({
 				scaleKey: 'x',
-				panelType: PANEL_TYPES.TIME_SERIES,
+				isTimeAxis: true,
 			}),
 		);
 
@@ -150,11 +149,11 @@ describe('UPlotAxisBuilder', () => {
 		expect(config.values).toBe(uPlotXAxisValuesFormat);
 	});
 
-	it('does not attach X-axis datetime formatter when panel type is not supported', () => {
+	it('does not attach X-axis datetime formatter for a non-time axis', () => {
 		const builder = new UPlotAxisBuilder(
 			createAxisProps({
 				scaleKey: 'x',
-				panelType: PANEL_TYPES.LIST, // not in PANEL_TYPES_WITH_X_AXIS_DATETIME_FORMAT
+				isTimeAxis: false,
 			}),
 		);
 
@@ -290,22 +289,9 @@ describe('UPlotAxisBuilder', () => {
 		expect(config.space).toBe(50);
 	});
 
-	it('includes PANEL_TYPES.BAR and PANEL_TYPES.TIME_SERIES in X-axis datetime formatter', () => {
-		const barBuilder = new UPlotAxisBuilder(
-			createAxisProps({
-				scaleKey: 'x',
-				panelType: PANEL_TYPES.BAR,
-			}),
-		);
-		expect(barBuilder.getConfig().values).toBe(uPlotXAxisValuesFormat);
-
-		const timeSeriesBuilder = new UPlotAxisBuilder(
-			createAxisProps({
-				scaleKey: 'x',
-				panelType: PANEL_TYPES.TIME_SERIES,
-			}),
-		);
-		expect(timeSeriesBuilder.getConfig().values).toBe(uPlotXAxisValuesFormat);
+	it('omits the X-axis datetime formatter when no time axis is declared', () => {
+		const builder = new UPlotAxisBuilder(createAxisProps({ scaleKey: 'x' }));
+		expect(builder.getConfig().values).toBeUndefined();
 	});
 
 	it('should return the existing size when cycleNum > 1', () => {

frontend/src/lib/uPlotV2/config/types.ts

@@ -1,5 +1,4 @@
 import { PrecisionOption } from 'components/Graph/types';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import uPlot, { Series } from 'uplot';
 
 import { ThresholdsDrawHookOptions } from '../hooks/types';
@@ -53,31 +52,53 @@ export interface ConfigBuilderProps {
  * Props for configuring an axis
  */
 export interface AxisProps {
+	/** Scale this axis is drawn against — `'x'` / `'y'`, matching an `addScale` key. Also
+	 * selects the default tick formatter and sizing (x: time, y: value + unit). */
 	scaleKey: string;
+	/** Axis title drawn alongside the ticks; omitted when there's nothing to name. */
 	label?: string;
+	/** Render the axis at all; false keeps the scale but draws no ticks or labels. */
 	show?: boolean;
-	side?: 0 | 1 | 2 | 3; // top, right, bottom, left
+	/** Which edge of the plot the axis sits on: 0 | 1 | 2 | 3 — top, right, bottom, left. */
+	side?: 0 | 1 | 2 | 3;
+	/** Tick/label color. Defaults to black or white from `isDarkMode`. */
 	stroke?: string;
+	/** Partial override of the grid lines; unset keys fall back to the theme defaults. */
 	grid?: {
 		stroke?: string;
 		width?: number;
 		show?: boolean;
 	};
+	/** Partial override of the tick marks; provided as-is to uPlot when set. */
 	ticks?: {
 		stroke?: string;
 		width?: number;
 		show?: boolean;
 		size?: number;
 	};
+	/** Explicit tick formatter, replacing the scale's default (time / unit-formatted). */
 	values?: uPlot.Axis.Values;
+	/** Explicit axis splits, overriding the default tick calculation. */
+	splits?: uPlot.Axis.Splits;
+	/** Pixels between the ticks and their labels; also feeds the y axis width calculation. */
 	gap?: number;
+	/** Explicit axis thickness. Left unset, the y axis sizes itself to its widest label. */
 	size?: uPlot.Axis.Size;
-	formatValue?: (v: number) => string;
-	space?: number; // Space for log scale axes
+	/** Minimum pixels between ticks, capping how many uPlot draws. For log scale axes. */
+	space?: number;
+	/** Picks the dark or light default for stroke and grid color. */
 	isDarkMode?: boolean;
+	/** Axis is on a log scale — thins the grid lines to keep dense decades readable. */
 	isLogScale?: boolean;
+	/** Unit the y axis ticks are formatted in (`spec.formatting.unit`). */
 	yAxisUnit?: string;
-	panelType?: PANEL_TYPES;
+	/**
+	 * X axis carries timestamps, so its ticks format as dates/times. Declared by the caller
+	 * rather than inferred from a panel type — a chart whose x axis is buckets or categories
+	 * (histogram) leaves it off.
+	 */
+	isTimeAxis?: boolean;
+	/** Decimal places for y axis tick values; unset lets the unit formatter decide. */
 	decimalPrecision?: PrecisionOption;
 }
 

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/__tests__/colorScale.test.ts

@@ -0,0 +1,207 @@
+import {
+	clampColorSteps,
+	createHeatmapColorResolver,
+	DEFAULT_COLOR_STEPS,
+	DEFAULT_HEATMAP_COLORS,
+	getMaxCount,
+	MAX_COLOR_STEPS,
+	MIN_OPACITY_ALPHA,
+	normalizeCount,
+	resolveCountDomain,
+} from '../colorScale';
+import { HeatmapColorMode, HeatmapColorScale } from '../types';
+
+const SERIES_COLOR = '#4e74f8';
+
+describe('getMaxCount', () => {
+	it('ignores null cells', () => {
+		expect(
+			getMaxCount([
+				[1, null, 9],
+				[null, 4],
+			]),
+		).toBe(9);
+	});
+
+	it('returns 0 for an empty or all-null grid', () => {
+		expect(getMaxCount([])).toBe(0);
+		expect(getMaxCount([[null, null]])).toBe(0);
+	});
+
+	it('ignores non-finite counts', () => {
+		expect(getMaxCount([[3, Number.POSITIVE_INFINITY, Number.NaN]])).toBe(3);
+	});
+});
+
+describe('resolveCountDomain', () => {
+	it('floors at 0 on auto so a zero count sits at the bottom of the scale', () => {
+		expect(
+			resolveCountDomain({ minCount: null, maxCount: null }, [[5, 20]]),
+		).toStrictEqual({
+			min: 0,
+			max: 20,
+		});
+	});
+
+	it('honours explicit clamps', () => {
+		expect(
+			resolveCountDomain({ minCount: 10, maxCount: 100 }, [[5, 20]]),
+		).toStrictEqual({
+			min: 10,
+			max: 100,
+		});
+	});
+
+	it('collapses a max at or below min', () => {
+		expect(
+			resolveCountDomain({ minCount: 50, maxCount: 10 }, [[5]]),
+		).toStrictEqual({
+			min: 50,
+			max: 50,
+		});
+	});
+});
+
+describe('normalizeCount', () => {
+	const domain = { min: 0, max: 1000 };
+
+	it('spreads low counts on a log scale where a linear one washes them out', () => {
+		const log = (count: number): number =>
+			normalizeCount({ count, domain, scale: HeatmapColorScale.Log });
+
+		expect(log(10)).toBeCloseTo(1 / 3, 5);
+		expect(log(20)).toBeCloseTo(Math.log10(20) / 3, 5);
+		expect(
+			normalizeCount({ count: 10, domain, scale: HeatmapColorScale.Linear }),
+		).toBeCloseTo(0.01, 5);
+	});
+
+	it('puts 0 and 1 at the bottom of a log scale', () => {
+		expect(
+			normalizeCount({ count: 0, domain, scale: HeatmapColorScale.Log }),
+		).toBe(0);
+		expect(
+			normalizeCount({ count: 1, domain, scale: HeatmapColorScale.Log }),
+		).toBe(0);
+	});
+
+	it('reaches the top of the scale at max on every scale', () => {
+		[
+			HeatmapColorScale.Log,
+			HeatmapColorScale.Sqrt,
+			HeatmapColorScale.Linear,
+		].forEach((scale) => {
+			expect(normalizeCount({ count: 1000, domain, scale })).toBeCloseTo(1, 6);
+		});
+	});
+
+	it('takes the square root of the linear position on a sqrt scale', () => {
+		expect(
+			normalizeCount({
+				count: 250,
+				domain: { min: 0, max: 1000 },
+				scale: HeatmapColorScale.Sqrt,
+			}),
+		).toBeCloseTo(0.5, 6);
+	});
+
+	it('clamps counts outside the domain', () => {
+		const scale = HeatmapColorScale.Linear;
+		expect(normalizeCount({ count: -5, domain, scale })).toBe(0);
+		expect(normalizeCount({ count: 5000, domain, scale })).toBe(1);
+	});
+
+	it('returns the bottom of the scale when min equals max', () => {
+		expect(
+			normalizeCount({
+				count: 7,
+				domain: { min: 7, max: 7 },
+				scale: HeatmapColorScale.Log,
+			}),
+		).toBe(0);
+	});
+
+	it('handles a log domain whose min and max share a decade floor', () => {
+		expect(
+			normalizeCount({
+				count: 1,
+				domain: { min: 0, max: 1 },
+				scale: HeatmapColorScale.Log,
+			}),
+		).toBe(0);
+	});
+});
+
+describe('clampColorSteps', () => {
+	it('clamps to the supported range', () => {
+		expect(clampColorSteps(1)).toBe(2);
+		expect(clampColorSteps(500)).toBe(MAX_COLOR_STEPS);
+		expect(clampColorSteps(32)).toBe(32);
+	});
+
+	it('falls back to the default for a non-finite value', () => {
+		expect(clampColorSteps(Number.NaN)).toBe(DEFAULT_COLOR_STEPS);
+	});
+});
+
+describe('createHeatmapColorResolver', () => {
+	const build = (
+		overrides: Partial<typeof DEFAULT_HEATMAP_COLORS> = {},
+		isDarkMode = true,
+	): ReturnType<typeof createHeatmapColorResolver> =>
+		createHeatmapColorResolver({
+			options: { ...DEFAULT_HEATMAP_COLORS, ...overrides },
+			domain: { min: 0, max: 1000 },
+			isDarkMode,
+			seriesColor: SERIES_COLOR,
+		});
+
+	it('leaves null cells uncoloured so they can be hatched', () => {
+		const resolver = build();
+
+		expect(resolver.colorFor(null)).toBeNull();
+		expect(resolver.positionOf(null)).toBeNull();
+	});
+
+	it('gives a zero count the bottom colour, not the null treatment', () => {
+		const resolver = build();
+
+		expect(resolver.colorFor(0)).toBe(resolver.ramp[0]);
+	});
+
+	it('emits one ramp entry per step', () => {
+		expect(build({ steps: 8 }).ramp).toHaveLength(8);
+	});
+
+	it('maps the max count to the top of the ramp', () => {
+		const resolver = build({ steps: 8 });
+
+		expect(resolver.colorFor(1000)).toBe(resolver.ramp[7]);
+	});
+
+	it('picks different stops per theme so low counts stay near the surface', () => {
+		expect(build({}, true).ramp[0]).not.toBe(build({}, false).ramp[0]);
+	});
+
+	it('varies alpha in opacity mode, never below the visibility floor', () => {
+		const resolver = build({ mode: HeatmapColorMode.Opacity, steps: 4 });
+
+		expect(resolver.ramp[0]).toBe(`rgba(78, 116, 248, ${MIN_OPACITY_ALPHA})`);
+		// `color` drops the alpha channel from the string once it reaches 1.
+		expect(resolver.ramp[3]).toBe('rgb(78, 116, 248)');
+	});
+
+	it('prefers an explicit opacity fill over the series colour', () => {
+		const resolver = build({
+			mode: HeatmapColorMode.Opacity,
+			fill: '#e5484d',
+			steps: 2,
+		});
+
+		expect(resolver.ramp[1]).toBe('rgb(229, 72, 77)');
+	});
+
+	it('reports the domain it applied', () => {
+		expect(build().domain).toStrictEqual({ min: 0, max: 1000 });
+	});
+});

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/__tests__/geometry.test.ts

@@ -0,0 +1,356 @@
+import {
+	canUseLogAxis,
+	decimateAxisSplits,
+	formatRowLabel,
+	resolveColumnIndex,
+	resolveHeatmapYAxis,
+	resolveRowIndex,
+} from '../geometry';
+import { HeatmapAxisScale } from '../types';
+
+const BOUNDS = [128, 256, 1024, 4096];
+
+describe('canUseLogAxis', () => {
+	it('accepts strictly positive bounds', () => {
+		expect(canUseLogAxis(BOUNDS)).toBe(true);
+	});
+
+	it('rejects a zero or negative bound', () => {
+		expect(canUseLogAxis([0, 128])).toBe(false);
+		expect(canUseLogAxis([-1, 128])).toBe(false);
+	});
+
+	it('rejects empty bounds', () => {
+		expect(canUseLogAxis([])).toBe(false);
+	});
+});
+
+describe('resolveHeatmapYAxis', () => {
+	it('turns N bounds into N+1 rows with underflow and overflow at the ends', () => {
+		const { rows } = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Log);
+
+		expect(rows).toHaveLength(BOUNDS.length + 1);
+		expect(rows[0]).toMatchObject({
+			upper: 128,
+			isUnderflow: true,
+			isOverflow: false,
+		});
+		expect(rows[1]).toMatchObject({ lower: 128, upper: 256 });
+		expect(rows[4]).toMatchObject({
+			lower: 4096,
+			isOverflow: true,
+			isUnderflow: false,
+		});
+	});
+
+	it('exposes one edge per row boundary, ascending', () => {
+		const { rows, edges } = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Log);
+
+		expect(edges).toHaveLength(rows.length + 1);
+		expect([...edges].sort((a, b) => a - b)).toStrictEqual(edges);
+	});
+
+	it('places bounds in log space so row heights are log-proportional', () => {
+		const { splits, min, max } = resolveHeatmapYAxis(
+			BOUNDS,
+			HeatmapAxisScale.Log,
+		);
+
+		expect(splits).toStrictEqual(BOUNDS.map((bound) => Math.log10(bound)));
+		// Outer edges extend by the geometric mean ratio, (4096/128)^(1/3) = 3.174…
+		expect(10 ** min).toBeCloseTo(128 / (4096 / 128) ** (1 / 3), 6);
+		expect(10 ** max).toBeCloseTo(4096 * (4096 / 128) ** (1 / 3), 6);
+	});
+
+	it('keeps bounds in value space on a linear axis', () => {
+		const { splits, min } = resolveHeatmapYAxis(
+			[10, 20, 30],
+			HeatmapAxisScale.Linear,
+		);
+
+		expect(splits).toStrictEqual([10, 20, 30]);
+		// Mean gap is 10, and the underflow edge never crosses zero.
+		expect(min).toBe(0);
+	});
+
+	it('sorts and de-duplicates bounds', () => {
+		const { rows, splits } = resolveHeatmapYAxis(
+			[256, 128, 256, Number.NaN],
+			HeatmapAxisScale.Log,
+		);
+
+		expect(splits).toStrictEqual([Math.log10(128), Math.log10(256)]);
+		expect(rows).toHaveLength(3);
+	});
+
+	it('gives a single bound an underflow and an overflow row', () => {
+		const { rows, edges } = resolveHeatmapYAxis([100], HeatmapAxisScale.Log);
+
+		expect(rows).toHaveLength(2);
+		expect(rows[0].isUnderflow).toBe(true);
+		expect(rows[1].isOverflow).toBe(true);
+		expect(edges).toHaveLength(3);
+	});
+
+	it('degrades to an empty axis with no bounds', () => {
+		expect(resolveHeatmapYAxis([], HeatmapAxisScale.Log).rows).toStrictEqual([]);
+	});
+
+	it('puts the overflow label on the row"s upper edge, clear of the last boundary', () => {
+		const { overflowSplit, edges } = resolveHeatmapYAxis(
+			BOUNDS,
+			HeatmapAxisScale.Log,
+		);
+
+		// A full row above the last boundary tick, so the two labels cannot collide.
+		expect(overflowSplit).toBe(edges[edges.length - 1]);
+	});
+});
+
+describe('resolveRowIndex', () => {
+	const { edges } = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Linear);
+
+	it('finds the row containing a value', () => {
+		expect(resolveRowIndex(edges, 200)).toBe(1);
+		expect(resolveRowIndex(edges, 2000)).toBe(3);
+	});
+
+	it('assigns a boundary to the row it opens', () => {
+		expect(resolveRowIndex(edges, 256)).toBe(2);
+	});
+
+	it('returns the last row on the top edge', () => {
+		expect(resolveRowIndex(edges, edges[edges.length - 1])).toBe(
+			edges.length - 2,
+		);
+	});
+
+	it('returns null outside the grid', () => {
+		expect(resolveRowIndex(edges, edges[0] - 1)).toBeNull();
+		expect(resolveRowIndex(edges, edges[edges.length - 1] + 1)).toBeNull();
+	});
+
+	it('returns null without at least one row', () => {
+		expect(resolveRowIndex([5], 5)).toBeNull();
+	});
+});
+
+describe('resolveColumnIndex', () => {
+	const timestamps = [100, 160, 220, 280];
+	const step = 60;
+
+	it('resolves by containment, not proximity', () => {
+		// 155 is nearer to 160, but the observations at 155 belong to column 0.
+		expect(resolveColumnIndex(timestamps, 155, step)).toBe(0);
+		expect(resolveColumnIndex(timestamps, 160, step)).toBe(1);
+	});
+
+	it('includes the column start and excludes its end', () => {
+		expect(resolveColumnIndex(timestamps, 100, step)).toBe(0);
+		expect(resolveColumnIndex(timestamps, 159.9, step)).toBe(0);
+	});
+
+	it('covers the trailing column using the step, not the next timestamp', () => {
+		expect(resolveColumnIndex(timestamps, 330, step)).toBe(3);
+		expect(resolveColumnIndex(timestamps, 340, step)).toBeNull();
+	});
+
+	it('returns null before the first column', () => {
+		expect(resolveColumnIndex(timestamps, 99, step)).toBeNull();
+	});
+
+	it('returns null with no columns', () => {
+		expect(resolveColumnIndex([], 100, step)).toBeNull();
+	});
+
+	it('leaves the last column open when the step is unknown', () => {
+		expect(resolveColumnIndex(timestamps, 10_000, 0)).toBe(3);
+	});
+});
+
+describe('formatRowLabel', () => {
+	const format = (value: number): string => `${value}ms`;
+	const { rows } = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Log);
+
+	it('labels the underflow row by its only real bound', () => {
+		expect(formatRowLabel(rows[0], format)).toBe('≤ 128ms');
+	});
+
+	it('labels the overflow row by its only real bound', () => {
+		expect(formatRowLabel(rows[rows.length - 1], format)).toBe('> 4096ms');
+	});
+
+	it('labels an interior row as a range', () => {
+		expect(formatRowLabel(rows[1], format)).toBe('128ms – 256ms');
+	});
+});
+
+describe('decimateAxisSplits', () => {
+	const splits = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+	const domain = { min: 0, max: 10 };
+
+	it('keeps every tick when they all fit', () => {
+		expect(
+			decimateAxisSplits({ ...domain, splits, plotHeight: 400, minGapPx: 18 }),
+		).toStrictEqual(splits);
+	});
+
+	it('thins to whatever fits at the available height', () => {
+		// 11 ticks over 100px is 10px apart; an 18px floor keeps every other one.
+		expect(
+			decimateAxisSplits({ ...domain, splits, plotHeight: 100, minGapPx: 18 }),
+		).toStrictEqual([0, 2, 4, 6, 8, 10]);
+	});
+
+	it('always keeps the topmost tick, so the overflow edge survives thinning', () => {
+		const thinned = decimateAxisSplits({
+			...domain,
+			splits,
+			plotHeight: 40,
+			minGapPx: 18,
+		});
+
+		expect(thinned[thinned.length - 1]).toBe(10);
+	});
+
+	it('returns ascending positions', () => {
+		const thinned = decimateAxisSplits({
+			...domain,
+			splits,
+			plotHeight: 60,
+			minGapPx: 18,
+		});
+
+		expect([...thinned].sort((a, b) => a - b)).toStrictEqual(thinned);
+	});
+
+	it('thins by pixel distance, not index, so uneven rows are handled', () => {
+		// Three boundaries bunched at the bottom of a wide linear domain: only the
+		// first and the far-away last are far enough apart to both get labels.
+		expect(
+			decimateAxisSplits({
+				splits: [1, 2, 3, 1000],
+				min: 0,
+				max: 1000,
+				plotHeight: 200,
+				minGapPx: 18,
+			}),
+		).toStrictEqual([3, 1000]);
+	});
+
+	it('leaves the tick set alone when it cannot measure', () => {
+		expect(
+			decimateAxisSplits({ ...domain, splits, plotHeight: 0, minGapPx: 18 }),
+		).toStrictEqual(splits);
+		expect(
+			decimateAxisSplits({
+				splits,
+				min: 5,
+				max: 5,
+				plotHeight: 400,
+				minGapPx: 18,
+			}),
+		).toStrictEqual(splits);
+	});
+});
+
+describe('resolveHeatmapYAxis — symmetric log', () => {
+	// The OTel SDK default explicit bucket boundaries, which start at zero.
+	const OTEL = [
+		0, 5, 10, 25, 50, 75, 100, 250, 500, 750, 1000, 2500, 5000, 7500, 10000,
+	];
+	// Clock skew in ms — a logs/traces field that straddles zero.
+	const SKEW = [-1000, -100, -10, -1, 0, 1, 10, 100, 1000];
+
+	const PLOT_HEIGHT = 250;
+
+	/** Row heights in axis units, which map linearly to pixels. */
+	function rowHeights(bounds: number[]): number[] {
+		const { edges } = resolveHeatmapYAxis(bounds, HeatmapAxisScale.Log);
+		return edges.slice(1).map((edge, index) => edge - edges[index]);
+	}
+
+	/** Shortest row, in pixels, for a plot of `PLOT_HEIGHT`. */
+	function shortestRowPx(bounds: number[], scale: HeatmapAxisScale): number {
+		const { edges } = resolveHeatmapYAxis(bounds, scale);
+		const span = edges[edges.length - 1] - edges[0];
+		const heights = edges
+			.slice(1)
+			.map((edge, index) => ((edge - edges[index]) / span) * PLOT_HEIGHT);
+		return Math.min(...heights);
+	}
+
+	it('keeps a zero boundary on a log axis instead of giving up to linear', () => {
+		const { splits } = resolveHeatmapYAxis([0, 5, 10], HeatmapAxisScale.Log);
+
+		// A linear fallback would leave the boundaries untransformed.
+		expect(splits).not.toStrictEqual([0, 5, 10]);
+	});
+
+	it('gives every row a usable height for the OTel default boundaries', () => {
+		// Linear squeezes the 0–100ms buckets — where the data is — under a pixel.
+		expect(shortestRowPx(OTEL, HeatmapAxisScale.Linear)).toBeLessThan(1);
+		expect(shortestRowPx(OTEL, HeatmapAxisScale.Log)).toBeGreaterThan(4);
+	});
+
+	it('gives the zero-crossing row a full decade, since it cannot be compressed', () => {
+		const heights = rowHeights(OTEL);
+		const { rows } = resolveHeatmapYAxis(OTEL, HeatmapAxisScale.Log);
+		const nearZero = rows.findIndex((row) => row.lower === 0 && row.upper === 5);
+
+		// One axis unit — the same space a decade gets above the threshold.
+		expect(heights[nearZero]).toBeCloseTo(1, 6);
+	});
+
+	it('places boundaries either side of zero symmetrically', () => {
+		const heights = rowHeights(SKEW);
+
+		expect(Math.max(...heights) - Math.min(...heights)).toBeCloseTo(0, 6);
+	});
+
+	it('keeps negative boundaries ascending', () => {
+		const { edges } = resolveHeatmapYAxis(SKEW, HeatmapAxisScale.Log);
+
+		expect([...edges].sort((a, b) => a - b)).toStrictEqual(edges);
+	});
+
+	it('round-trips a boundary back to its bucket value', () => {
+		const { splits, toBucketValue } = resolveHeatmapYAxis(
+			SKEW,
+			HeatmapAxisScale.Log,
+		);
+
+		expect(
+			splits.map((split) => Math.round(toBucketValue(split) * 1e6) / 1e6),
+		).toStrictEqual(SKEW);
+	});
+
+	it('derives the linear threshold from the smallest non-zero boundary', () => {
+		// Threshold 10 puts -10 at -1 and 0 at 0 in axis space.
+		const { edges, rows } = resolveHeatmapYAxis(
+			[-100, -10, 0, 10, 100],
+			HeatmapAxisScale.Log,
+		);
+		const crossing = rows.findIndex(
+			(row) => row.lower === -10 && row.upper === 0,
+		);
+
+		expect(edges[crossing]).toBeCloseTo(-1, 6);
+		expect(edges[crossing + 1]).toBeCloseTo(0, 6);
+	});
+
+	it('leaves an all-positive layout on a plain log axis', () => {
+		const { splits } = resolveHeatmapYAxis(
+			[128, 256, 1024],
+			HeatmapAxisScale.Log,
+		);
+
+		expect(splits).toStrictEqual([128, 256, 1024].map((b) => Math.log10(b)));
+	});
+
+	it('falls back to linear when every boundary is zero', () => {
+		const { splits } = resolveHeatmapYAxis([0], HeatmapAxisScale.Log);
+
+		expect(splits).toStrictEqual([0]);
+	});
+});

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/__tests__/grid.test.ts

@@ -0,0 +1,176 @@
+import { resolveHeatmapGrid } from '../grid';
+import { HeatmapSeries } from '../types';
+
+const BUCKETS = [10, 20];
+const STEP = 60;
+
+/** Two groups over two columns, each missing a value the other reports. */
+const TWO_GROUPS: HeatmapSeries[] = [
+	{
+		label: 'cart',
+		points: [
+			{ timestamp: 60, counts: [1, 2, 3] },
+			{ timestamp: 120, counts: [null, 5, 6] },
+		],
+	},
+	{
+		label: 'checkout',
+		points: [
+			{ timestamp: 60, counts: [10, 20, 30] },
+			{ timestamp: 120, counts: [40, null, 60] },
+		],
+	},
+];
+
+function resolve(
+	overrides: Partial<Parameters<typeof resolveHeatmapGrid>[0]> = {},
+): ReturnType<typeof resolveHeatmapGrid> {
+	return resolveHeatmapGrid({
+		buckets: BUCKETS,
+		step: STEP,
+		series: TWO_GROUPS,
+		...overrides,
+	});
+}
+
+describe('resolveHeatmapGrid', () => {
+	it('pivots per-timestamp count arrays into one row per bucket', () => {
+		const { counts } = resolve({ series: [TWO_GROUPS[0]] });
+
+		// 2 boundaries describe 3 rows; each row spans both columns.
+		expect(counts).toStrictEqual([
+			[1, null],
+			[2, 5],
+			[3, 6],
+		]);
+	});
+
+	it('carries the bounds and step through untouched', () => {
+		const { bounds, step } = resolve();
+
+		expect(bounds).toStrictEqual(BUCKETS);
+		expect(step).toBe(STEP);
+	});
+
+	it('sums every group for the combined view', () => {
+		const { counts } = resolve();
+
+		expect(counts[0]).toStrictEqual([11, 40]);
+		expect(counts[2]).toStrictEqual([33, 66]);
+	});
+
+	it('keeps one group"s count where the other has no data', () => {
+		const { counts } = resolve();
+
+		// cart is null at 120 in row 0 while checkout reports 40.
+		expect(counts[0][1]).toBe(40);
+		// checkout is null at 120 in row 1 while cart reports 5.
+		expect(counts[1][1]).toBe(5);
+	});
+
+	it('reports a cell as no-data only when every group is missing it', () => {
+		const { counts } = resolve({
+			buckets: [10],
+			series: [
+				{ label: 'a', points: [{ timestamp: 60, counts: [null, null] }] },
+				{ label: 'b', points: [{ timestamp: 60, counts: [null, null] }] },
+			],
+		});
+
+		expect(counts).toStrictEqual([[null], [null]]);
+	});
+
+	it('distinguishes a zero count from no data', () => {
+		const { counts } = resolve({
+			buckets: [10],
+			series: [{ label: 'a', points: [{ timestamp: 60, counts: [0, null] }] }],
+		});
+
+		expect(counts[0][0]).toBe(0);
+		expect(counts[1][0]).toBeNull();
+	});
+
+	it('sums only the groups the legend has enabled', () => {
+		const { counts } = resolve({ visibleGroups: ['cart'] });
+
+		expect(counts[0]).toStrictEqual([1, null]);
+		expect(counts[2]).toStrictEqual([3, 6]);
+	});
+
+	it('sums every group when the legend passes nothing', () => {
+		const { counts } = resolve({ visibleGroups: undefined });
+
+		expect(counts[0]).toStrictEqual([11, 40]);
+	});
+
+	it('ignores an enabled label that left the result', () => {
+		const { counts } = resolve({ visibleGroups: ['cart', 'gone'] });
+
+		expect(counts[0]).toStrictEqual([1, null]);
+	});
+
+	it('empties the grid when every group is excluded', () => {
+		const { timestamps, counts } = resolve({ visibleGroups: [] });
+
+		expect(timestamps).toStrictEqual([]);
+		expect(counts.every((row) => row.length === 0)).toBe(true);
+	});
+
+	it('unions timestamps when groups do not align', () => {
+		const { timestamps, counts } = resolve({
+			buckets: [10],
+			series: [
+				{ label: 'a', points: [{ timestamp: 60, counts: [1, 2] }] },
+				{ label: 'b', points: [{ timestamp: 180, counts: [3, 4] }] },
+			],
+		});
+
+		expect(timestamps).toStrictEqual([60, 180]);
+		expect(counts[0]).toStrictEqual([1, 3]);
+	});
+
+	it('sorts columns ascending regardless of response order', () => {
+		const { timestamps } = resolve({
+			buckets: [10],
+			series: [
+				{
+					label: 'a',
+					points: [
+						{ timestamp: 180, counts: [1, 2] },
+						{ timestamp: 60, counts: [3, 4] },
+					],
+				},
+			],
+		});
+
+		expect(timestamps).toStrictEqual([60, 180]);
+	});
+
+	it('pads rows the response left short', () => {
+		const { counts } = resolve({
+			buckets: [10, 20, 30],
+			series: [{ label: 'a', points: [{ timestamp: 60, counts: [1, 2] }] }],
+		});
+
+		expect(counts).toStrictEqual([[1], [2], [null], [null]]);
+	});
+
+	it('ignores counts beyond the bucket rows', () => {
+		const { counts } = resolve({
+			buckets: [10],
+			series: [{ label: 'a', points: [{ timestamp: 60, counts: [1, 2, 99] }] }],
+		});
+
+		expect(counts).toStrictEqual([[1], [2]]);
+	});
+
+	it('degrades to an empty grid with no buckets or no series', () => {
+		expect(resolve({ buckets: [] })).toStrictEqual({
+			bounds: [],
+			timestamps: [],
+			step: 0,
+			counts: [],
+		});
+		expect(resolve({ series: [] }).counts).toStrictEqual([]);
+	});
+});

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/__tests__/heatmapPlugin.test.ts

@@ -0,0 +1,289 @@
+import type uPlot from 'uplot';
+
+import { DEFAULT_HEATMAP_COLORS } from '../colorScale';
+import { resolveHeatmapYAxis } from '../geometry';
+import { createHeatmapHooks } from '../heatmapPlugin';
+import { HeatmapAxisScale, HeatmapCell } from '../types';
+
+const BOUNDS = [100, 1000];
+const Y_AXIS = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Linear);
+const TIMESTAMPS = [1000, 1060, 1120];
+const STEP = 60;
+const PLOT_WIDTH = 300;
+const PLOT_HEIGHT = 300;
+
+// Three rows for two bounds, three columns; row 1 column 1 is a data gap.
+const DATA = [
+	TIMESTAMPS,
+	[1, 2, 3],
+	[4, null, 6],
+	[7, 8, 9],
+] as unknown as uPlot.AlignedData;
+
+interface FakeContext {
+	fillRect: jest.Mock;
+	fills: string[];
+}
+
+interface FakePlot {
+	plot: uPlot;
+	context: FakeContext;
+	setSeries: jest.Mock;
+	over: HTMLDivElement;
+}
+
+function createFakePlot(cursor: { left: number; top: number }): FakePlot {
+	const over = document.createElement('div');
+	Object.defineProperty(over, 'clientWidth', { value: PLOT_WIDTH });
+	Object.defineProperty(over, 'clientHeight', { value: PLOT_HEIGHT });
+
+	const fills: string[] = [];
+	const fillRect = jest.fn();
+	const context = { fills, fillRect };
+	const setSeries = jest.fn();
+
+	const xSpan = TIMESTAMPS[TIMESTAMPS.length - 1] + STEP - TIMESTAMPS[0];
+	const ySpan = Y_AXIS.max - Y_AXIS.min;
+
+	const ctx = {
+		save: jest.fn(),
+		restore: jest.fn(),
+		beginPath: jest.fn(),
+		rect: jest.fn(),
+		clip: jest.fn(),
+		moveTo: jest.fn(),
+		lineTo: jest.fn(),
+		stroke: jest.fn(),
+		setLineDash: jest.fn(),
+		createPattern: jest.fn(() => null),
+		set fillStyle(value: string) {
+			fills.push(value);
+		},
+		fillRect: (...args: number[]): void => {
+			fillRect(...args);
+		},
+	};
+
+	const plot = {
+		data: DATA,
+		cursor,
+		over,
+		setSeries,
+		ctx,
+		bbox: { left: 0, top: 0, width: PLOT_WIDTH, height: PLOT_HEIGHT },
+		scales: { x: { min: TIMESTAMPS[0], max: TIMESTAMPS[2] + STEP } },
+		// x grows left to right; y is inverted, so the highest bucket is at the top.
+		valToPos: (value: number, scaleKey: string): number =>
+			scaleKey === 'x'
+				? ((value - TIMESTAMPS[0]) / xSpan) * PLOT_WIDTH
+				: PLOT_HEIGHT - ((value - Y_AXIS.min) / ySpan) * PLOT_HEIGHT,
+		posToVal: (pos: number, scaleKey: string): number =>
+			scaleKey === 'x'
+				? TIMESTAMPS[0] + (pos / PLOT_WIDTH) * xSpan
+				: Y_AXIS.min + ((PLOT_HEIGHT - pos) / PLOT_HEIGHT) * ySpan,
+	};
+
+	return { plot: plot as unknown as uPlot, context, setSeries, over };
+}
+
+function createHooks(
+	onHoverChange?: (cell: HeatmapCell | null) => void,
+	dimOnHover = true,
+): ReturnType<typeof createHeatmapHooks> {
+	return createHeatmapHooks({
+		yAxis: Y_AXIS,
+		step: STEP,
+		colors: DEFAULT_HEATMAP_COLORS,
+		isDarkMode: true,
+		seriesColor: '#4e74f8',
+		dimOnHover,
+		onHoverChange,
+	});
+}
+
+describe('heatmap renderer — lifecycle', () => {
+	it('mounts the hover overlay into the plot overlay and tears it down', () => {
+		const hooks = createHooks();
+		const { plot, over } = createFakePlot({ left: -10, top: -10 });
+
+		hooks.init(plot);
+		expect(
+			over.querySelector('[data-testid="heatmap-hover-overlay"]'),
+		).not.toBeNull();
+
+		hooks.destroy(plot);
+		expect(
+			over.querySelector('[data-testid="heatmap-hover-overlay"]'),
+		).toBeNull();
+	});
+});
+
+describe('heatmap renderer — draw', () => {
+	it('paints every cell of every visible column', () => {
+		const hooks = createHooks();
+		const { plot, context } = createFakePlot({ left: -10, top: -10 });
+
+		hooks.init(plot);
+		hooks.draw(plot);
+
+		// 3 rows x 3 columns, less the one null cell that has no hatch pattern
+		// available under jsdom.
+		expect(context.fillRect).toHaveBeenCalledTimes(8);
+	});
+
+	it('gives a zero count the bottom-of-scale fill rather than skipping it', () => {
+		const hooks = createHooks();
+		const zeroed = [TIMESTAMPS, [0, 0, 0], [0, 0, 0], [0, 0, 0]];
+		const { plot, context } = createFakePlot({ left: -10, top: -10 });
+		(plot as { data: unknown }).data = zeroed;
+
+		hooks.init(plot);
+		hooks.draw(plot);
+
+		expect(context.fillRect).toHaveBeenCalledTimes(9);
+		expect(new Set(context.fills).size).toBe(1);
+	});
+
+	it('skips columns outside the current x range', () => {
+		const hooks = createHooks();
+		const { plot, context } = createFakePlot({ left: -10, top: -10 });
+		(plot as { scales: unknown }).scales = {
+			x: { min: TIMESTAMPS[0], max: TIMESTAMPS[0] + STEP },
+		};
+
+		hooks.init(plot);
+		hooks.draw(plot);
+
+		// Only the first two columns overlap the range; the third starts past its end.
+		// 2 columns x 3 rows, less the null cell in column 1.
+		expect(context.fillRect).toHaveBeenCalledTimes(5);
+	});
+
+	it('draws nothing without columns', () => {
+		const hooks = createHooks();
+		const { plot, context } = createFakePlot({ left: -10, top: -10 });
+		(plot as { data: unknown }).data = [[]];
+
+		hooks.init(plot);
+		hooks.draw(plot);
+
+		expect(context.fillRect).not.toHaveBeenCalled();
+	});
+});
+
+describe('heatmap renderer — hover', () => {
+	it('focuses the hovered row and reports the cell under the cursor', () => {
+		const onHoverChange = jest.fn();
+		const hooks = createHooks(onHoverChange);
+		// Left third of the plot is column 0; the top third is the overflow row.
+		const { plot, setSeries } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+
+		expect(onHoverChange).toHaveBeenCalledWith({ row: 2, column: 0, count: 7 });
+		expect(setSeries).toHaveBeenCalledWith(3, { focus: true });
+	});
+
+	it('reports a data gap as a null count instead of zero', () => {
+		const onHoverChange = jest.fn();
+		const hooks = createHooks(onHoverChange);
+		const { plot } = createFakePlot({
+			left: PLOT_WIDTH / 2,
+			top: PLOT_HEIGHT / 2,
+		});
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+
+		expect(onHoverChange).toHaveBeenCalledWith({
+			row: 1,
+			column: 1,
+			count: null,
+		});
+	});
+
+	it('does not re-report the same cell', () => {
+		const onHoverChange = jest.fn();
+		const hooks = createHooks(onHoverChange);
+		const { plot } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+		hooks.setCursor(plot);
+
+		expect(onHoverChange).toHaveBeenCalledTimes(1);
+	});
+
+	it('shows the overlay over the hovered cell and dims around it', () => {
+		const hooks = createHooks(undefined, true);
+		const { plot, over } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+
+		const overlay = over.querySelector<HTMLDivElement>(
+			'[data-testid="heatmap-hover-overlay"]',
+		);
+		expect(overlay?.style.display).toBe('block');
+		// Column 0 spans the left third of a 300px plot.
+		expect(overlay?.lastElementChild).toHaveStyle({
+			left: '0px',
+			width: '100px',
+		});
+	});
+
+	it('collapses the dim rects when dimming is off', () => {
+		const hooks = createHooks(undefined, false);
+		const { plot, over } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+
+		const overlay = over.querySelector<HTMLDivElement>(
+			'[data-testid="heatmap-hover-overlay"]',
+		);
+		expect(overlay?.firstElementChild).toHaveStyle({
+			width: '0px',
+			height: '0px',
+		});
+	});
+
+	it('releases focus and hides the overlay when the cursor leaves', () => {
+		const onHoverChange = jest.fn();
+		const hooks = createHooks(onHoverChange);
+		const { plot, over, setSeries } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+		(plot as { cursor: { left: number; top: number } }).cursor = {
+			left: -10,
+			top: -10,
+		};
+		hooks.setCursor(plot);
+
+		expect(onHoverChange).toHaveBeenLastCalledWith(null);
+		expect(setSeries).toHaveBeenLastCalledWith(null, { focus: true });
+		expect(
+			over.querySelector<HTMLDivElement>('[data-testid="heatmap-hover-overlay"]')
+				?.style.display,
+		).toBe('none');
+	});
+
+	it('clears the hover when the cursor is inside the plot but past the last column', () => {
+		const onHoverChange = jest.fn();
+		const hooks = createHooks(onHoverChange);
+		const { plot } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+		(plot as { data: unknown }).data = [[], [], [], []];
+		(plot as { cursor: { left: number; top: number } }).cursor = {
+			left: 10,
+			top: 10,
+		};
+		hooks.setCursor(plot);
+
+		expect(onHoverChange).toHaveBeenLastCalledWith(null);
+	});
+});

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/__tests__/palettes.test.ts

@@ -0,0 +1,75 @@
+import { getPaletteStops } from '../palettes';
+import { HeatmapColorPalette } from '../types';
+
+const ALL_PALETTES = Object.values(HeatmapColorPalette);
+
+/** Perceived brightness, good enough to tell a ramp's ends apart. */
+function luminance(hex: string): number {
+	const value = parseInt(hex.slice(1), 16);
+	// eslint-disable-next-line no-bitwise
+	const [r, g, b] = [(value >> 16) & 255, (value >> 8) & 255, value & 255];
+	return 0.2126 * r + 0.7152 * g + 0.0722 * b;
+}
+
+describe('getPaletteStops', () => {
+	it.each(ALL_PALETTES)('%s is a full ramp of valid colours', (palette) => {
+		const stops = getPaletteStops(palette, true);
+
+		expect(stops).toHaveLength(9);
+		stops.forEach((stop) => expect(stop).toMatch(/^#[0-9a-f]{6}$/));
+	});
+
+	it.each(ALL_PALETTES)(
+		'%s climbs from dark to bright on a dark panel',
+		(palette) => {
+			const stops = getPaletteStops(palette, true);
+
+			// Low counts must sit near the surface, whichever direction the ramp is
+			// stored in — otherwise empty cells become the loudest thing on screen.
+			expect(luminance(stops[0])).toBeLessThan(luminance(stops[stops.length - 1]));
+		},
+	);
+
+	it.each(ALL_PALETTES)(
+		'%s falls from pale to saturated on a light panel',
+		(palette) => {
+			const stops = getPaletteStops(palette, false);
+
+			expect(luminance(stops[0])).toBeGreaterThan(
+				luminance(stops[stops.length - 1]),
+			);
+		},
+	);
+
+	it.each(ALL_PALETTES)('%s uses the same colours in both themes', (palette) => {
+		// Only the polarity flips; the palette itself is theme-independent.
+		expect([...getPaletteStops(palette, false)].reverse()).toStrictEqual(
+			getPaletteStops(palette, true),
+		);
+	});
+
+	it('never mutates the stored ramp when reversing it', () => {
+		const first = getPaletteStops(HeatmapColorPalette.Lava, false);
+		const second = getPaletteStops(HeatmapColorPalette.Lava, false);
+
+		expect(first).toStrictEqual(second);
+	});
+
+	it('falls back to the first ramp for an unknown palette', () => {
+		const unknown = 'nope' as HeatmapColorPalette;
+
+		expect(getPaletteStops(unknown, true)).toStrictEqual(
+			getPaletteStops(HeatmapColorPalette.Ice, true),
+		);
+	});
+
+	it('offers a neutral ramp for panels that already spend colour elsewhere', () => {
+		const stops = getPaletteStops(HeatmapColorPalette.Graphite, true);
+
+		// Every stop is a grey: red, green and blue channels stay equal.
+		stops.forEach((stop) => {
+			expect(stop.slice(1, 3)).toBe(stop.slice(3, 5));
+			expect(stop.slice(3, 5)).toBe(stop.slice(5, 7));
+		});
+	});
+});

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/colorScale.ts

@@ -0,0 +1,198 @@
+import { Color as DesignToken } from '@signozhq/design-tokens';
+import Color from 'color';
+
+import { getPaletteStops } from './palettes';
+import {
+	HeatmapColorMode,
+	HeatmapColorOptions,
+	HeatmapColorScale,
+	HeatmapColorPalette,
+} from './types';
+
+export const MIN_COLOR_STEPS = 2;
+export const MAX_COLOR_STEPS = 128;
+export const DEFAULT_COLOR_STEPS = 64;
+
+/** Without a floor, the lowest counts read as "no data". */
+export const MIN_OPACITY_ALPHA = 0.1;
+
+/** Used when neither an explicit fill nor a series colour is available. */
+export const DEFAULT_OPACITY_FILL = DesignToken.BG_ROBIN_500;
+
+export const DEFAULT_HEATMAP_COLORS: HeatmapColorOptions = {
+	mode: HeatmapColorMode.Palette,
+	scale: HeatmapColorScale.Log,
+	minCount: null,
+	maxCount: null,
+	palette: HeatmapColorPalette.Lava,
+	steps: DEFAULT_COLOR_STEPS,
+	fill: '',
+};
+
+export interface CountDomain {
+	min: number;
+	max: number;
+}
+
+/** Highest count, ignoring `null`. 0 for an empty grid. */
+export function getMaxCount(counts: Array<Array<number | null>>): number {
+	let max = 0;
+	for (const row of counts) {
+		for (const count of row) {
+			if (count !== null && Number.isFinite(count) && count > max) {
+				max = count;
+			}
+		}
+	}
+	return max;
+}
+
+/** Explicit clamps win; otherwise 0 to the grid's highest count. */
+export function resolveCountDomain(
+	options: Pick<HeatmapColorOptions, 'minCount' | 'maxCount'>,
+	counts: Array<Array<number | null>>,
+): CountDomain {
+	const min = options.minCount ?? 0;
+	const max = options.maxCount ?? getMaxCount(counts);
+	return max > min ? { min, max } : { min, max: min };
+}
+
+/** Position on the colour scale, 0..1. A degenerate domain collapses to 0 so an
+ *  all-zero grid renders at the bottom rather than disappearing. */
+export function normalizeCount({
+	count,
+	domain,
+	scale,
+}: {
+	count: number;
+	domain: CountDomain;
+	scale: HeatmapColorScale;
+}): number {
+	const { min, max } = domain;
+	if (!(max > min)) {
+		return 0;
+	}
+
+	const clamped = Math.min(Math.max(count, min), max);
+
+	if (scale === HeatmapColorScale.Log) {
+		// 0 and 1 both sit at the bottom; log of either is meaningless.
+		const logMin = Math.log10(Math.max(min, 1));
+		const logMax = Math.log10(Math.max(max, 1));
+		if (!(logMax > logMin)) {
+			return 0;
+		}
+		return (Math.log10(Math.max(clamped, 1)) - logMin) / (logMax - logMin);
+	}
+
+	const linear = (clamped - min) / (max - min);
+	return scale === HeatmapColorScale.Sqrt ? Math.sqrt(linear) : linear;
+}
+
+export function clampColorSteps(steps: number): number {
+	if (!Number.isFinite(steps)) {
+		return DEFAULT_COLOR_STEPS;
+	}
+	return Math.min(Math.max(Math.round(steps), MIN_COLOR_STEPS), MAX_COLOR_STEPS);
+}
+
+/** Colour at `t` (0..1) along a multi-stop ramp. */
+function sampleStops(stops: string[], t: number): string {
+	if (stops.length === 0) {
+		return 'transparent';
+	}
+	if (stops.length === 1) {
+		return stops[0];
+	}
+	const scaled = Math.min(Math.max(t, 0), 1) * (stops.length - 1);
+	const lower = Math.min(Math.floor(scaled), stops.length - 2);
+	return Color(stops[lower])
+		.mix(Color(stops[lower + 1]), scaled - lower)
+		.hex();
+}
+
+/**
+ * Colour the densest cells are drawn with — the palette's extreme, or the opacity
+ * fill at full strength. Depends only on the options, not on the data, so callers
+ * can read it before a grid exists.
+ */
+export function resolveExtremeColor({
+	options,
+	isDarkMode,
+	seriesColor,
+}: {
+	options: HeatmapColorOptions;
+	isDarkMode: boolean;
+	seriesColor: string;
+}): string {
+	if (options.mode === HeatmapColorMode.Opacity) {
+		return options.fill || seriesColor || DEFAULT_OPACITY_FILL;
+	}
+	const stops = getPaletteStops(options.palette, isDarkMode);
+	return stops[stops.length - 1] ?? DEFAULT_OPACITY_FILL;
+}
+
+export interface HeatmapColorResolver {
+	/** `null` for a `null` count, which must be hatched. */
+	colorFor: (count: number | null) => string | null;
+	/** 0..1, or `null` for a `null` count. */
+	positionOf: (count: number | null) => number | null;
+	/** Low to high. The colour bar renders exactly these. */
+	ramp: string[];
+	domain: CountDomain;
+}
+
+/** Palette mode walks a sequential ramp; opacity mode varies the alpha of one
+ *  fill, so the grid matches its group's legend swatch. */
+export function createHeatmapColorResolver({
+	options,
+	domain,
+	isDarkMode,
+	seriesColor,
+}: {
+	options: HeatmapColorOptions;
+	domain: CountDomain;
+	isDarkMode: boolean;
+	/** Opacity-mode fill when `options.fill` is empty. */
+	seriesColor: string;
+}): HeatmapColorResolver {
+	const steps = clampColorSteps(options.steps);
+	const positions = Array.from({ length: steps }, (_, index) =>
+		steps === 1 ? 0 : index / (steps - 1),
+	);
+
+	let ramp: string[];
+	if (options.mode === HeatmapColorMode.Opacity) {
+		const base = Color(options.fill || seriesColor || DEFAULT_OPACITY_FILL);
+		ramp = positions.map((t) =>
+			base
+				.alpha(MIN_OPACITY_ALPHA + t * (1 - MIN_OPACITY_ALPHA))
+				.rgb()
+				.string(),
+		);
+	} else {
+		const stops = getPaletteStops(options.palette, isDarkMode);
+		ramp = positions.map((t) => sampleStops(stops, t));
+	}
+
+	const positionOf = (count: number | null): number | null => {
+		if (count === null || !Number.isFinite(count)) {
+			return null;
+		}
+		return normalizeCount({ count, domain, scale: options.scale });
+	};
+
+	return {
+		positionOf,
+		colorFor: (count): string | null => {
+			const t = positionOf(count);
+			if (t === null) {
+				return null;
+			}
+			const index = Math.min(Math.floor(t * steps), steps - 1);
+			return ramp[index];
+		},
+		ramp,
+		domain,
+	};
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/geometry.ts

@@ -0,0 +1,297 @@
+import { HeatmapAxisScale, HeatmapRow, HeatmapYAxis } from './types';
+
+/** Used when the ratio cannot be inferred, i.e. a single boundary. */
+const FALLBACK_LOG_RATIO = 2;
+
+const EMPTY_Y_AXIS: HeatmapYAxis = {
+	rows: [],
+	edges: [],
+	splits: [],
+	overflowSplit: null,
+	toBucketValue: (axisValue: number): number => axisValue,
+	min: 0,
+	max: 1,
+};
+
+/** Ascending, finite, de-duplicated boundaries. */
+function normalizeBounds(bounds: number[]): number[] {
+	const sorted = bounds
+		.filter((bound) => Number.isFinite(bound))
+		.sort((a, b) => a - b);
+	return sorted.filter(
+		(bound, index) => index === 0 || bound !== sorted[index - 1],
+	);
+}
+
+/** True when a plain log axis can place every boundary. */
+export function canUseLogAxis(bounds: number[]): boolean {
+	return bounds.length > 0 && bounds.every((bound) => bound > 0);
+}
+
+interface AxisTransform {
+	toAxisValue: (value: number) => number;
+	toBucketValue: (axisValue: number) => number;
+}
+
+const LINEAR_TRANSFORM: AxisTransform = {
+	toAxisValue: (value) => value,
+	toBucketValue: (axisValue) => axisValue,
+};
+
+const LOG_TRANSFORM: AxisTransform = {
+	toAxisValue: (value) => Math.log10(value),
+	toBucketValue: (axisValue) => 10 ** axisValue,
+};
+
+/**
+ * Where "near zero" starts, taken as the smallest non-zero boundary magnitude. The
+ * bucket layout already declares it, so it never needs to be configured.
+ */
+function resolveLinearThreshold(bounds: number[]): number {
+	let threshold = Number.POSITIVE_INFINITY;
+	for (const bound of bounds) {
+		const magnitude = Math.abs(bound);
+		if (magnitude > 0 && magnitude < threshold) {
+			threshold = magnitude;
+		}
+	}
+	return Number.isFinite(threshold) ? threshold : 1;
+}
+
+/**
+ * Symmetric log: linear within ±threshold, logarithmic beyond, mirrored across
+ * zero. Bucketing an arbitrary logs/traces field can straddle zero — clock skew,
+ * deltas, balances — which a plain log cannot place at all, and which a linear axis
+ * squeezes into sub-pixel rows exactly where the interesting data sits.
+ *
+ * The gradient kink at ±threshold is invisible here: the threshold *is* a boundary,
+ * so it lands on a row edge, and row edges are already discrete.
+ */
+function createSymlogTransform(threshold: number): AxisTransform {
+	return {
+		toAxisValue: (value) =>
+			Math.abs(value) <= threshold
+				? value / threshold
+				: Math.sign(value) * (1 + Math.log10(Math.abs(value) / threshold)),
+		toBucketValue: (axisValue) =>
+			Math.abs(axisValue) <= 1
+				? axisValue * threshold
+				: Math.sign(axisValue) * threshold * 10 ** (Math.abs(axisValue) - 1),
+	};
+}
+
+function resolveAxisTransform(
+	bounds: number[],
+	scale: HeatmapAxisScale,
+): AxisTransform {
+	if (scale !== HeatmapAxisScale.Log) {
+		return LINEAR_TRANSFORM;
+	}
+	if (canUseLogAxis(bounds)) {
+		return LOG_TRANSFORM;
+	}
+	// All-zero bounds have no magnitude to scale against.
+	if (!bounds.some((bound) => bound !== 0)) {
+		return LINEAR_TRANSFORM;
+	}
+	return createSymlogTransform(resolveLinearThreshold(bounds));
+}
+
+/**
+ * The open-ended rows still need a height, so each gets the grid's typical bucket
+ * width — the mean gap in axis space, which on a geometric layout is exactly one
+ * bucket ratio. Linear stays in value space so it can refuse to cross zero.
+ */
+function resolveOuterEdges(
+	bounds: number[],
+	transform: AxisTransform,
+	isLinear: boolean,
+): { lower: number; upper: number } {
+	const first = bounds[0];
+	const last = bounds[bounds.length - 1];
+
+	if (isLinear) {
+		const gap = bounds.length > 1 ? (last - first) / (bounds.length - 1) : 0;
+		const safeGap = gap > 0 ? gap : Math.abs(first) || 1;
+		// Never extend below zero unless the boundaries already do.
+		const lower = first > 0 ? Math.max(0, first - safeGap) : first - safeGap;
+		return { lower, upper: last + safeGap };
+	}
+
+	const axisFirst = transform.toAxisValue(first);
+	const axisLast = transform.toAxisValue(last);
+	const fallback = Math.log10(FALLBACK_LOG_RATIO);
+	const gap =
+		bounds.length > 1 ? (axisLast - axisFirst) / (bounds.length - 1) : fallback;
+	const safeGap = gap > 0 ? gap : fallback;
+
+	return {
+		lower: transform.toBucketValue(axisFirst - safeGap),
+		upper: transform.toBucketValue(axisLast + safeGap),
+	};
+}
+
+/** N boundaries produce N+1 rows: an underflow row below the first, and the
+ *  `+Inf` overflow row above the last. */
+export function resolveHeatmapYAxis(
+	bounds: number[],
+	scale: HeatmapAxisScale,
+): HeatmapYAxis {
+	const normalized = normalizeBounds(bounds);
+	if (normalized.length === 0) {
+		return EMPTY_Y_AXIS;
+	}
+
+	const transform = resolveAxisTransform(normalized, scale);
+	const isLinear = transform === LINEAR_TRANSFORM;
+	const { toAxisValue, toBucketValue } = transform;
+
+	const { lower, upper } = resolveOuterEdges(normalized, transform, isLinear);
+	const last = normalized[normalized.length - 1];
+
+	const rows: HeatmapRow[] = [
+		{ lower, upper: normalized[0], isUnderflow: true, isOverflow: false },
+	];
+	for (let index = 1; index < normalized.length; index += 1) {
+		rows.push({
+			lower: normalized[index - 1],
+			upper: normalized[index],
+			isUnderflow: false,
+			isOverflow: false,
+		});
+	}
+	rows.push({ lower: last, upper, isUnderflow: false, isOverflow: true });
+
+	const edges = [
+		toAxisValue(lower),
+		...normalized.map(toAxisValue),
+		toAxisValue(upper),
+	];
+
+	return {
+		rows,
+		edges,
+		splits: normalized.map(toAxisValue),
+		overflowSplit: toAxisValue(upper),
+		toBucketValue,
+		min: edges[0],
+		max: edges[edges.length - 1],
+	};
+}
+
+/** Row containing `axisValue`, or `null` when it falls outside the grid. */
+export function resolveRowIndex(
+	edges: number[],
+	axisValue: number,
+): number | null {
+	if (edges.length < 2) {
+		return null;
+	}
+	if (axisValue < edges[0] || axisValue > edges[edges.length - 1]) {
+		return null;
+	}
+
+	let low = 0;
+	let high = edges.length - 2;
+	while (low <= high) {
+		const mid = (low + high) >> 1;
+		if (axisValue < edges[mid]) {
+			high = mid - 1;
+		} else if (axisValue >= edges[mid + 1]) {
+			low = mid + 1;
+		} else {
+			return mid;
+		}
+	}
+	// Exactly on the top edge.
+	return edges.length - 2;
+}
+
+/**
+ * A containment test, not a nearest-timestamp lookup: uPlot's own `cursor.idx`
+ * snaps to the closest boundary and would report the next column as soon as the
+ * cursor passed a cell's midpoint.
+ */
+export function resolveColumnIndex(
+	timestamps: ArrayLike<number>,
+	xValue: number,
+	step: number,
+): number | null {
+	if (timestamps.length === 0) {
+		return null;
+	}
+
+	let low = 0;
+	let high = timestamps.length - 1;
+	let candidate = -1;
+	while (low <= high) {
+		const mid = (low + high) >> 1;
+		if (timestamps[mid] <= xValue) {
+			candidate = mid;
+			low = mid + 1;
+		} else {
+			high = mid - 1;
+		}
+	}
+
+	if (candidate < 0) {
+		return null;
+	}
+	const width = step > 0 ? step : Number.POSITIVE_INFINITY;
+	return xValue < timestamps[candidate] + width ? candidate : null;
+}
+
+/** The open-ended rows are labelled by their one real boundary; the synthetic
+ *  edge is a drawing device, not a value. */
+export function formatRowLabel(
+	row: HeatmapRow,
+	formatValue: (value: number) => string,
+): string {
+	if (row.isOverflow) {
+		return `> ${formatValue(row.lower)}`;
+	}
+	if (row.isUnderflow) {
+		return `≤ ${formatValue(row.upper)}`;
+	}
+	return `${formatValue(row.lower)} – ${formatValue(row.upper)}`;
+}
+
+/**
+ * Drops boundary ticks that would overlap. Filters by pixel distance rather than
+ * index, since linear rows are not the same height, and walks down from the top
+ * so the `∞` edge survives whatever else is dropped.
+ */
+export function decimateAxisSplits({
+	splits,
+	min,
+	max,
+	plotHeight,
+	minGapPx,
+}: {
+	/** Candidates in axis space, ascending. */
+	splits: number[];
+	min: number;
+	max: number;
+	/** Plotting area height, in CSS pixels. */
+	plotHeight: number;
+	minGapPx: number;
+}): number[] {
+	if (splits.length < 2 || plotHeight <= 0 || minGapPx <= 0 || !(max > min)) {
+		return splits;
+	}
+
+	const pixelsPerUnit = plotHeight / (max - min);
+	const kept: number[] = [];
+	let lastPosition = 0;
+
+	for (let index = splits.length - 1; index >= 0; index -= 1) {
+		// Axis values grow upward, pixel offsets downward.
+		const position = (max - splits[index]) * pixelsPerUnit;
+		if (kept.length === 0 || position - lastPosition >= minGapPx) {
+			kept.push(splits[index]);
+			lastPosition = position;
+		}
+	}
+
+	return kept.reverse();
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/grid.ts

@@ -0,0 +1,99 @@
+import { HeatmapGrid, HeatmapSeries } from './types';
+
+const EMPTY_GRID: HeatmapGrid = {
+	bounds: [],
+	timestamps: [],
+	step: 0,
+	counts: [],
+};
+
+/**
+ * Highest single-cell count each group reaches. Read against the same domain the
+ * colour bar uses, this is where a group sits on that bar.
+ */
+export function resolveGroupPeaks(
+	series: HeatmapSeries[],
+): Map<string, number> {
+	const peaks = new Map<string, number>();
+	series.forEach((entry) => {
+		let peak = 0;
+		entry.points.forEach((point) =>
+			point.counts.forEach((count) => {
+				if (count !== null && count > peak) {
+					peak = count;
+				}
+			}),
+		);
+		peaks.set(entry.label, peak);
+	});
+	return peaks;
+}
+
+/** Groups the legend currently has enabled. `undefined` means all of them. */
+function resolveVisible(
+	series: HeatmapSeries[],
+	visibleGroups: string[] | undefined,
+): HeatmapSeries[] {
+	if (visibleGroups === undefined) {
+		return series;
+	}
+	const allowed = new Set(visibleGroups);
+	return series.filter((entry) => allowed.has(entry.label));
+}
+
+/**
+ * Pivots the response's column-major counts into the row-major grid the renderer
+ * draws, and sums the enabled groups — counts are additive, so the sum is exact and
+ * needs no extra request. A cell is `null` only when no group contributed to it.
+ */
+export function resolveHeatmapGrid({
+	buckets,
+	step,
+	series,
+	visibleGroups,
+}: {
+	buckets: number[];
+	/** Column width in seconds. */
+	step: number;
+	series: HeatmapSeries[];
+	/** Labels the legend has enabled. `undefined` sums every group. */
+	visibleGroups?: string[];
+}): HeatmapGrid {
+	if (buckets.length === 0 || series.length === 0) {
+		return EMPTY_GRID;
+	}
+
+	const selected = resolveVisible(series, visibleGroups);
+
+	// Groups are not guaranteed to share timestamps, so the columns are their union.
+	const timestampSet = new Set<number>();
+	selected.forEach((entry) => {
+		entry.points.forEach((point) => timestampSet.add(point.timestamp));
+	});
+	const timestamps = Array.from(timestampSet).sort((a, b) => a - b);
+	const columnOf = new Map(timestamps.map((value, index) => [value, index]));
+
+	// N boundaries describe N+1 rows: the underflow row and the `+Inf` overflow row.
+	const rowCount = buckets.length + 1;
+	const counts: Array<Array<number | null>> = Array.from(
+		{ length: rowCount },
+		() => new Array<number | null>(timestamps.length).fill(null),
+	);
+
+	selected.forEach((entry) => {
+		entry.points.forEach((point) => {
+			const column = columnOf.get(point.timestamp);
+			if (column === undefined) {
+				return;
+			}
+			point.counts.forEach((count, row) => {
+				if (row >= rowCount || count === null || count === undefined) {
+					return;
+				}
+				counts[row][column] = (counts[row][column] ?? 0) + count;
+			});
+		});
+	});
+
+	return { bounds: buckets, timestamps, step, counts };
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/heatmapPlugin.ts

@@ -0,0 +1,170 @@
+import uPlot from 'uplot';
+
+import {
+	createHeatmapColorResolver,
+	HeatmapColorResolver,
+	resolveCountDomain,
+} from './colorScale';
+import { resolveColumnIndex, resolveRowIndex } from './geometry';
+import {
+	createHoverOverlay,
+	HeatmapHoverOverlay,
+	showHoverOverlay,
+} from './hoverOverlay';
+import { createHatchPattern, drawCells, drawOverflowBoundary } from './paint';
+import { HeatmapCell, HeatmapColorOptions, HeatmapYAxis } from './types';
+
+export interface HeatmapRenderOptions {
+	yAxis: HeatmapYAxis;
+	/** Column width in seconds. */
+	step: number;
+	colors: HeatmapColorOptions;
+	isDarkMode: boolean;
+	/** Opacity-mode fill when `colors.fill` is empty. */
+	seriesColor: string;
+	/** Default true. */
+	dimOnHover?: boolean;
+	/** `null` when the cursor leaves. */
+	onHoverChange?: (cell: HeatmapCell | null) => void;
+}
+
+/**
+ * Registered through `UPlotConfigBuilder.addHook`, not as a `uPlot.Plugin`: uPlot
+ * appends plugin hooks *after* the hook arrays, and `setCursor` must run before
+ * TooltipPlugin's so the focused row is resolved when the tooltip positions
+ * itself. As a plugin it trails a frame and the tooltip flashes at the origin.
+ */
+export interface HeatmapHooks {
+	init: (u: uPlot) => void;
+	draw: (u: uPlot) => void;
+	setCursor: (u: uPlot) => void;
+	destroy: (u: uPlot) => void;
+}
+
+export function createHeatmapHooks({
+	yAxis,
+	step,
+	colors,
+	isDarkMode,
+	seriesColor,
+	dimOnHover = true,
+	onHoverChange,
+}: HeatmapRenderOptions): HeatmapHooks {
+	let overlay: HeatmapHoverOverlay | null = null;
+	let hovered: HeatmapCell | null = null;
+	let hatchPattern: CanvasPattern | null = null;
+
+	// On auto, the domain comes from the data, but these hooks are captured once at
+	// config-build time. Resolving lazily keeps a refetch on uPlot's `setData` path
+	// rather than forcing a rebuild.
+	let cachedData: uPlot.AlignedData | null = null;
+	let cachedResolver: HeatmapColorResolver | null = null;
+
+	function getResolver(u: uPlot): HeatmapColorResolver {
+		if (cachedResolver && cachedData === u.data) {
+			return cachedResolver;
+		}
+		cachedResolver = createHeatmapColorResolver({
+			options: colors,
+			domain: resolveCountDomain(
+				colors,
+				u.data.slice(1) as Array<Array<number | null>>,
+			),
+			isDarkMode,
+			seriesColor,
+		});
+		cachedData = u.data;
+		return cachedResolver;
+	}
+
+	function clearHover(u: uPlot): void {
+		if (overlay) {
+			overlay.container.style.display = 'none';
+		}
+		if (hovered === null) {
+			return;
+		}
+		hovered = null;
+		u.setSeries(null, { focus: true });
+		onHoverChange?.(null);
+	}
+
+	return {
+		init: (u: uPlot): void => {
+			overlay = createHoverOverlay(isDarkMode);
+			u.over.appendChild(overlay.container);
+		},
+
+		draw: (u: uPlot): void => {
+			const timestamps = u.data[0] as ArrayLike<number> | undefined;
+			if (!timestamps?.length || yAxis.rows.length === 0) {
+				return;
+			}
+			const { ctx } = u;
+			hatchPattern ??= createHatchPattern(ctx, isDarkMode);
+
+			ctx.save();
+			ctx.beginPath();
+			ctx.rect(u.bbox.left, u.bbox.top, u.bbox.width, u.bbox.height);
+			ctx.clip();
+			drawCells({ u, yAxis, step, resolver: getResolver(u), hatchPattern });
+			ctx.restore();
+
+			drawOverflowBoundary({ u, yAxis, isDarkMode });
+		},
+
+		setCursor: (u: uPlot): void => {
+			const { left = -10, top = -10 } = u.cursor;
+			if (left < 0 || top < 0) {
+				clearHover(u);
+				return;
+			}
+
+			const column = resolveColumnIndex(
+				u.data[0] as ArrayLike<number>,
+				u.posToVal(left, 'x'),
+				step,
+			);
+			const row = resolveRowIndex(yAxis.edges, u.posToVal(top, 'y'));
+			if (column === null || row === null) {
+				clearHover(u);
+				return;
+			}
+			if (hovered?.row === row && hovered?.column === column) {
+				return;
+			}
+
+			hovered = {
+				row,
+				column,
+				count:
+					(u.data[row + 1] as Array<number | null> | undefined)?.[column] ?? null,
+			};
+			// Drives TooltipPlugin, which only shows a tooltip for a focused series.
+			// uPlot's own focus is disabled here: it picks the series nearest in value
+			// space, and a heatmap's value is a colour, not a y coordinate.
+			u.setSeries(row + 1, { focus: true });
+			if (overlay) {
+				showHoverOverlay({
+					overlay,
+					u,
+					yAxis,
+					step,
+					row,
+					column,
+					dim: dimOnHover,
+				});
+			}
+			onHoverChange?.(hovered);
+		},
+
+		destroy: (): void => {
+			overlay?.container.remove();
+			overlay = null;
+			hovered = null;
+			hatchPattern = null;
+			cachedData = null;
+			cachedResolver = null;
+		},
+	};
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/hoverOverlay.ts

@@ -0,0 +1,118 @@
+import { Color } from '@signozhq/design-tokens';
+import uPlot from 'uplot';
+
+import { HeatmapYAxis } from './types';
+
+const HIGHLIGHT_BORDER_WIDTH = 1;
+/** ~55% alpha. */
+const DIM_ALPHA = '8C';
+
+export interface HeatmapHoverOverlay {
+	container: HTMLDivElement;
+	highlight: HTMLDivElement;
+	/** Four corner rects whose complement is the hovered row/column cross. */
+	dims: HTMLDivElement[];
+}
+
+function createOverlayElement(): HTMLDivElement {
+	const element = document.createElement('div');
+	element.style.position = 'absolute';
+	element.style.pointerEvents = 'none';
+	return element;
+}
+
+function setRect(
+	element: HTMLDivElement,
+	left: number,
+	top: number,
+	width: number,
+	height: number,
+): void {
+	element.style.left = `${left}px`;
+	element.style.top = `${top}px`;
+	element.style.width = `${Math.max(0, width)}px`;
+	element.style.height = `${Math.max(0, height)}px`;
+}
+
+/** Kept out of the canvas so moving between cells repositions a few nodes
+ *  instead of repainting the grid. */
+export function createHoverOverlay(isDarkMode: boolean): HeatmapHoverOverlay {
+	const container = createOverlayElement();
+	container.style.inset = '0';
+	container.style.display = 'none';
+	container.setAttribute('data-testid', 'heatmap-hover-overlay');
+
+	const dimColor = `${
+		isDarkMode ? Color.BG_INK_500 : Color.BG_VANILLA_100
+	}${DIM_ALPHA}`;
+	const dims = Array.from({ length: 4 }, () => {
+		const dim = createOverlayElement();
+		dim.style.background = dimColor;
+		container.appendChild(dim);
+		return dim;
+	});
+
+	const highlight = createOverlayElement();
+	highlight.style.border = `${HIGHLIGHT_BORDER_WIDTH}px solid ${
+		isDarkMode ? Color.BG_VANILLA_100 : Color.BG_INK_300
+	}`;
+	highlight.style.boxSizing = 'border-box';
+	container.appendChild(highlight);
+
+	return { container, highlight, dims };
+}
+
+/** Positions the highlight, and the four corner rects so only the hovered row
+ *  and column stay at full contrast. */
+export function showHoverOverlay({
+	overlay,
+	u,
+	yAxis,
+	step,
+	row,
+	column,
+	dim,
+}: {
+	overlay: HeatmapHoverOverlay;
+	u: uPlot;
+	yAxis: HeatmapYAxis;
+	step: number;
+	row: number;
+	column: number;
+	dim: boolean;
+}): void {
+	const timestamps = u.data[0] as ArrayLike<number>;
+	const width = u.over.clientWidth;
+	const height = u.over.clientHeight;
+
+	const cellLeft = u.valToPos(timestamps[column], 'x');
+	const cellRight = u.valToPos(timestamps[column] + step, 'x');
+	const cellTop = u.valToPos(yAxis.edges[row + 1], 'y');
+	const cellBottom = u.valToPos(yAxis.edges[row], 'y');
+
+	setRect(
+		overlay.highlight,
+		cellLeft,
+		cellTop,
+		cellRight - cellLeft,
+		cellBottom - cellTop,
+	);
+
+	const [topLeft, topRight, bottomLeft, bottomRight] = overlay.dims;
+	if (dim) {
+		setRect(topLeft, 0, 0, cellLeft, cellTop);
+		setRect(topRight, cellRight, 0, width - cellRight, cellTop);
+		setRect(bottomLeft, 0, cellBottom, cellLeft, height - cellBottom);
+		setRect(
+			bottomRight,
+			cellRight,
+			cellBottom,
+			width - cellRight,
+			height - cellBottom,
+		);
+	} else {
+		overlay.dims.forEach((element) => setRect(element, 0, 0, 0, 0));
+	}
+
+	overlay.container.style.display = 'block';
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/paint.ts

@@ -0,0 +1,128 @@
+import { Color } from '@signozhq/design-tokens';
+import uPlot from 'uplot';
+
+import { HeatmapColorResolver } from './colorScale';
+import { HeatmapYAxis } from './types';
+
+/** Cells at least this wide/tall keep a hairline separator. */
+const MIN_CELL_SIZE_FOR_GAP = 4;
+const HATCH_TILE_SIZE = 6;
+const OVERFLOW_DASH: [number, number] = [4, 3];
+
+/** Hatch for `null` cells: a gap must never share the bottom-of-scale fill, or a
+ *  scrape outage reads as a quiet period. */
+export function createHatchPattern(
+	ctx: CanvasRenderingContext2D,
+	isDarkMode: boolean,
+): CanvasPattern | null {
+	const pxRatio = uPlot.pxRatio;
+	const size = Math.max(2, Math.round(HATCH_TILE_SIZE * pxRatio));
+	const tile = document.createElement('canvas');
+	tile.width = size;
+	tile.height = size;
+
+	const tileCtx = tile.getContext('2d');
+	if (!tileCtx) {
+		return null;
+	}
+	tileCtx.strokeStyle = isDarkMode
+		? `${Color.BG_VANILLA_400}59`
+		: `${Color.BG_INK_300}40`;
+	tileCtx.lineWidth = Math.max(1, pxRatio);
+	tileCtx.beginPath();
+	// Three strokes keep the pattern continuous across tile seams.
+	tileCtx.moveTo(0, size);
+	tileCtx.lineTo(size, 0);
+	tileCtx.moveTo(-size / 2, size / 2);
+	tileCtx.lineTo(size / 2, -size / 2);
+	tileCtx.moveTo(size / 2, size * 1.5);
+	tileCtx.lineTo(size * 1.5, size / 2);
+	tileCtx.stroke();
+
+	return ctx.createPattern(tile, 'repeat');
+}
+
+/** One canvas pass. Offscreen columns are skipped rather than clipped. */
+// eslint-disable-next-line sonarjs/cognitive-complexity
+export function drawCells({
+	u,
+	yAxis,
+	step,
+	resolver,
+	hatchPattern,
+}: {
+	u: uPlot;
+	yAxis: HeatmapYAxis;
+	step: number;
+	resolver: HeatmapColorResolver;
+	hatchPattern: CanvasPattern | null;
+}): void {
+	const { ctx } = u;
+	const timestamps = u.data[0] as ArrayLike<number>;
+	const { rows, edges } = yAxis;
+	const pxRatio = uPlot.pxRatio;
+
+	const xMin = u.scales.x.min ?? timestamps[0];
+	const xMax = u.scales.x.max ?? timestamps[timestamps.length - 1] + step;
+	const rowEdgePositions = edges.map((edge) => u.valToPos(edge, 'y', true));
+
+	for (let column = 0; column < timestamps.length; column += 1) {
+		const columnStart = timestamps[column];
+		const columnEnd = columnStart + step;
+		if (columnEnd < xMin || columnStart > xMax) {
+			continue;
+		}
+
+		const left = u.valToPos(columnStart, 'x', true);
+		const rawWidth = u.valToPos(columnEnd, 'x', true) - left;
+		const gapX = rawWidth > MIN_CELL_SIZE_FOR_GAP * pxRatio ? pxRatio : 0;
+		const width = Math.max(1, rawWidth - gapX);
+
+		for (let row = 0; row < rows.length; row += 1) {
+			const top = rowEdgePositions[row + 1];
+			const rawHeight = rowEdgePositions[row] - top;
+			const gapY = rawHeight > MIN_CELL_SIZE_FOR_GAP * pxRatio ? pxRatio : 0;
+
+			const count = (u.data[row + 1] as Array<number | null> | undefined)?.[
+				column
+			];
+			const fill = resolver.colorFor(count ?? null);
+
+			if (fill === null && hatchPattern === null) {
+				continue;
+			}
+			ctx.fillStyle = fill ?? (hatchPattern as CanvasPattern);
+			ctx.fillRect(left, top, width, Math.max(1, rawHeight - gapY));
+		}
+	}
+}
+
+/** The `+Inf` row is unbounded, so its height is a drawing convenience and
+ *  should not be compared with the real buckets. */
+export function drawOverflowBoundary({
+	u,
+	yAxis,
+	isDarkMode,
+}: {
+	u: uPlot;
+	yAxis: HeatmapYAxis;
+	isDarkMode: boolean;
+}): void {
+	const overflowIndex = yAxis.rows.length - 1;
+	if (overflowIndex < 1 || !yAxis.rows[overflowIndex].isOverflow) {
+		return;
+	}
+
+	const { ctx } = u;
+	const y = Math.round(u.valToPos(yAxis.edges[overflowIndex], 'y', true));
+
+	ctx.save();
+	ctx.setLineDash(OVERFLOW_DASH);
+	ctx.lineWidth = Math.max(1, uPlot.pxRatio);
+	ctx.strokeStyle = isDarkMode ? Color.BG_VANILLA_400 : Color.BG_INK_300;
+	ctx.beginPath();
+	ctx.moveTo(u.bbox.left, y);
+	ctx.lineTo(u.bbox.left + u.bbox.width, y);
+	ctx.stroke();
+	ctx.restore();
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/palettes.ts

@@ -0,0 +1,167 @@
+import { HeatmapColorPalette } from './types';
+
+interface PaletteDefinition {
+	/** Evenly spaced, one end of the ramp to the other. */
+	stops: string[];
+	/** `true` when `stops[0]` is the dark end. */
+	darkFirst: boolean;
+}
+
+/**
+ * Stop values come from the long-established public palette families —
+ * ColorBrewer for the hue ramps, matplotlib's perceptual set for the rest.
+ */
+const PALETTES: Record<HeatmapColorPalette, PaletteDefinition> = {
+	[HeatmapColorPalette.Ice]: {
+		darkFirst: false,
+		stops: [
+			'#f7fbff',
+			'#deebf7',
+			'#c3dbee',
+			'#9cc8e2',
+			'#6daed5',
+			'#4391c6',
+			'#2271b4',
+			'#0c5198',
+			'#08306b',
+		],
+	},
+	[HeatmapColorPalette.Moss]: {
+		darkFirst: false,
+		stops: [
+			'#f7fcf5',
+			'#e3f4de',
+			'#c6e8bf',
+			'#a0d89b',
+			'#73c378',
+			'#45aa5d',
+			'#228b45',
+			'#066b2d',
+			'#00441b',
+		],
+	},
+	[HeatmapColorPalette.Rust]: {
+		darkFirst: false,
+		stops: [
+			'#fff5f0',
+			'#feddcf',
+			'#fcbaa1',
+			'#fc9273',
+			'#f9694c',
+			'#eb3d2f',
+			'#cb1c1e',
+			'#a10e15',
+			'#67000d',
+		],
+	},
+	[HeatmapColorPalette.Graphite]: {
+		darkFirst: false,
+		stops: [
+			'#ffffff',
+			'#efefef',
+			'#d8d8d8',
+			'#bbbbbb',
+			'#979797',
+			'#737373',
+			'#505050',
+			'#262626',
+			'#000000',
+		],
+	},
+	[HeatmapColorPalette.Ember]: {
+		darkFirst: false,
+		stops: [
+			'#ffffcc',
+			'#ffeda0',
+			'#fed676',
+			'#feb250',
+			'#fd893c',
+			'#f8502b',
+			'#e11e20',
+			'#b90424',
+			'#800026',
+		],
+	},
+	[HeatmapColorPalette.Lagoon]: {
+		darkFirst: false,
+		stops: [
+			'#ffffd9',
+			'#eaf7b8',
+			'#c1e7b5',
+			'#81cebb',
+			'#45b4c2',
+			'#248fbd',
+			'#2260a9',
+			'#20378d',
+			'#081d58',
+		],
+	},
+	[HeatmapColorPalette.Orchid]: {
+		darkFirst: false,
+		stops: [
+			'#fff7f3',
+			'#fddfdc',
+			'#fcc3c3',
+			'#fa9cb4',
+			'#f369a3',
+			'#da3495',
+			'#ad0a81',
+			'#7b0176',
+			'#49006a',
+		],
+	},
+	[HeatmapColorPalette.Verdant]: {
+		darkFirst: true,
+		stops: [
+			'#440154',
+			'#472d7b',
+			'#3b528b',
+			'#2c728e',
+			'#21918c',
+			'#28ae80',
+			'#5ec962',
+			'#addc30',
+			'#fde725',
+		],
+	},
+	[HeatmapColorPalette.Lava]: {
+		darkFirst: true,
+		stops: [
+			'#000004',
+			'#1d1147',
+			'#51127c',
+			'#832681',
+			'#b73779',
+			'#e75263',
+			'#fc8961',
+			'#fec488',
+			'#fcfdbf',
+		],
+	},
+	[HeatmapColorPalette.Beacon]: {
+		darkFirst: true,
+		stops: [
+			'#002051',
+			'#11366c',
+			'#3c4d6e',
+			'#62646f',
+			'#7f7c75',
+			'#9a9478',
+			'#bbaf71',
+			'#e2cb5c',
+			'#fdea45',
+		],
+	},
+};
+
+/** Stops oriented low-count first for the active theme. At the wrong polarity,
+ *  empty cells become the loudest thing on screen. */
+export function getPaletteStops(
+	palette: HeatmapColorPalette,
+	isDarkMode: boolean,
+): string[] {
+	const definition = PALETTES[palette] ?? PALETTES[HeatmapColorPalette.Ice];
+	return definition.darkFirst === isDarkMode
+		? definition.stops
+		: [...definition.stops].reverse();
+}

frontend/src/lib/uPlotV2/plugins/HeatmapPlugin/types.ts

@@ -0,0 +1,113 @@
+export enum HeatmapColorScale {
+	Log = 'log',
+	Sqrt = 'sqrt',
+	Linear = 'linear',
+}
+
+export enum HeatmapColorMode {
+	Palette = 'palette',
+	Opacity = 'opacity',
+}
+
+/** Sequential ramps only: colour means "count", so a midpoint or hue cycle would
+ *  read as a threshold that does not exist. */
+export enum HeatmapColorPalette {
+	Ice = 'ice',
+	Moss = 'moss',
+	Rust = 'rust',
+	Graphite = 'graphite',
+	Ember = 'ember',
+	Lagoon = 'lagoon',
+	Orchid = 'orchid',
+	Verdant = 'verdant',
+	Lava = 'lava',
+	Beacon = 'beacon',
+}
+
+export interface HeatmapColorOptions {
+	mode: HeatmapColorMode;
+	scale: HeatmapColorScale;
+	/** `null` derives it, which is always 0 — a count of 0 belongs at the bottom. */
+	minCount: number | null;
+	/** `null` derives it from the grid's highest count. */
+	maxCount: number | null;
+	palette: HeatmapColorPalette;
+	/** Colour steps the ramp is quantised into, 2..128. Unrelated to `step`, the
+	 *  column width in seconds. */
+	steps: number;
+	/** Opacity mode. Empty falls back to the caller's series colour. */
+	fill: string;
+}
+
+/** Row-height distribution of the bucket axis. */
+export enum HeatmapAxisScale {
+	Log = 'log',
+	Linear = 'linear',
+}
+
+export interface HeatmapSeriesPoint {
+	/** Column start, in seconds. */
+	timestamp: number;
+	/** One per bucket row, lowest first. `null` is "no data", never `0`. */
+	counts: Array<number | null>;
+}
+
+export interface HeatmapSeriesLabel {
+	key: string;
+	value: string;
+}
+
+export interface HeatmapSeries {
+	/** Group label, as the legend names it. Empty when there is no grouping. */
+	label: string;
+	/** The pairs behind `label`, letting the tooltip name rows by value alone. */
+	labels?: HeatmapSeriesLabel[];
+	points: HeatmapSeriesPoint[];
+}
+
+/** Counts pivoted into rows and aligned to one column axis. Internal to the
+ *  chart, which resolves it from `buckets` and `series`. */
+export interface HeatmapGrid {
+	/** Ascending. N boundaries describe N+1 rows, including the `+Inf` overflow. */
+	bounds: number[];
+	/** Column starts, in seconds. */
+	timestamps: number[];
+	/** Column width in seconds. Cells span `[timestamps[j], timestamps[j] + step)`,
+	 *  and the last column has no successor to infer it from. */
+	step: number;
+	/** `counts[row][column]`, row 0 lowest. `null` (no data) renders hatched, `0`
+	 *  at the bottom of the scale — conflating them hides an outage. */
+	counts: Array<Array<number | null>>;
+}
+
+export interface HeatmapRow {
+	/** Synthetic on the underflow row. */
+	lower: number;
+	/** Synthetic on the overflow row. */
+	upper: number;
+	isUnderflow: boolean;
+	isOverflow: boolean;
+}
+
+/** The bucket axis in uPlot y-scale space. A log axis is log10 values on a
+ *  *linear* scale, not uPlot's log distribution, so boundaries stay exactly on
+ *  ticks and uPlot's decade-only label filter cannot hide them. */
+export interface HeatmapYAxis {
+	rows: HeatmapRow[];
+	/** Row edges, ascending. Length is `rows.length + 1`. */
+	edges: number[];
+	/** Real bucket boundaries — one tick each. */
+	splits: number[];
+	/** Where the `∞` tick goes: the overflow row's upper edge, not its centre,
+	 *  which would sit half a row from the last boundary and collide with it. */
+	overflowSplit: number | null;
+	toBucketValue: (axisValue: number) => number;
+	min: number;
+	max: number;
+}
+
+export interface HeatmapCell {
+	row: number;
+	column: number;
+	count: number | null;
+}

frontend/src/lib/visualization/charts/ChartWrapper/ChartWrapper.tsx

@@ -41,6 +41,9 @@ export default function ChartWrapper({
 	customTooltip,
 	pinnedTooltipElement,
 	tooltipPortalRoot,
+	customLegend,
+	legendLabels,
+	contentFooter,
 	'data-testid': testId,
 }: ChartWrapperProps): JSX.Element {
 	const plotInstanceRef = useRef<uPlot | null>(null);
@@ -61,6 +64,10 @@ export default function ChartWrapper({
 			if (!showLegend) {
 				return null;
 			}
+			// Charts whose legend does not list uPlot series supply their own.
+			if (customLegend) {
+				return customLegend(averageLegendWidth);
+			}
 			return (
 				<UPlotLegend
 					config={config}
@@ -69,7 +76,7 @@ export default function ChartWrapper({
 				/>
 			);
 		},
-		[config, legendConfig.position, showLegend],
+		[config, legendConfig.position, showLegend, customLegend],
 	);
 
 	const renderTooltipCallback = useCallback(
@@ -100,6 +107,8 @@ export default function ChartWrapper({
 				containerHeight={containerHeight}
 				legendConfig={legendConfig}
 				legendComponent={legendComponent}
+				seriesLabels={legendLabels}
+				contentFooter={contentFooter}
 				layoutChildren={layoutChildren}
 			>
 				{({ chartWidth, chartHeight, averageLegendWidth }): JSX.Element => (

frontend/src/lib/visualization/charts/Heatmap/Heatmap.tsx

@@ -0,0 +1,310 @@
+import { useCallback, useMemo, useRef, useState } from 'react';
+import ChartWrapper from 'lib/visualization/charts/ChartWrapper/ChartWrapper';
+import ColorBar from 'lib/uPlotV2/components/ColorBar/ColorBar';
+import Legend from 'lib/uPlotV2/components/Legend/Legend';
+import HeatmapTooltip from 'lib/uPlotV2/components/Tooltip/components/HeatmapTooltip/HeatmapTooltip';
+import {
+	LegendPosition,
+	TooltipRenderArgs,
+} from 'lib/uPlotV2/components/types';
+import {
+	createHeatmapColorResolver,
+	DEFAULT_HEATMAP_COLORS,
+	resolveCountDomain,
+	resolveExtremeColor,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/colorScale';
+import type { LegendItem } from 'lib/uPlotV2/config/types';
+import { resolveHeatmapYAxis } from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import {
+	resolveGroupPeaks,
+	resolveHeatmapGrid,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/grid';
+import {
+	HeatmapAxisScale,
+	HeatmapCell,
+	HeatmapColorMode,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+import { ChartClickData } from 'lib/uPlotV2/plugins/TooltipPlugin/types';
+
+import { HeatmapChartProps } from 'lib/visualization/charts/types';
+import { useHeatmapGroupLegend } from './useHeatmapGroupLegend';
+import { buildHeatmapConfig, prepareHeatmapChartData } from './utils';
+
+/** Vertical space the colour bar takes out of the container. */
+const COLOR_BAR_HEIGHT = 28;
+
+/**
+ * Columns are time slices, rows are bucket ranges, cell colour is the observation
+ * count — so a distribution can be watched changing shape instead of collapsing to
+ * percentile lines. Drawn on canvas (see `createHeatmapHooks`): a 40 × 240 grid is
+ * ~9,600 cells, far past what per-cell DOM carries.
+ */
+export default function Heatmap(props: HeatmapChartProps): JSX.Element {
+	const {
+		id,
+		buckets,
+		step,
+		series,
+		width,
+		height,
+		isDarkMode,
+		axisScale = HeatmapAxisScale.Log,
+		yAxisUnit,
+		decimalPrecision,
+		timezone,
+		showVisualMap = true,
+		showLegend = true,
+		legendPosition = LegendPosition.BOTTOM,
+		dimOnHover = true,
+		showTooltip = true,
+		canPinTooltip = false,
+		pinKey,
+		seriesColor,
+		minTimeScale,
+		maxTimeScale,
+		onDragSelect,
+		onCellClick,
+		renderTooltipFooter,
+		tooltipPortalRoot,
+		layoutChildren,
+		'data-testid': testId,
+	} = props;
+
+	const [hoveredCell, setHoveredCell] = useState<HeatmapCell | null>(null);
+	const hoveredCellRef = useRef<HeatmapCell | null>(null);
+	const onCellClickRef = useRef(onCellClick);
+	onCellClickRef.current = onCellClick;
+
+	const groups = useMemo(() => series.map((entry) => entry.label), [series]);
+
+	// One series has nothing to choose between.
+	const hasGroupLegend = showLegend && groups.length > 1;
+
+	const colors = useMemo(
+		() => ({ ...DEFAULT_HEATMAP_COLORS, ...props.colors }),
+		[props.colors],
+	);
+
+	// The opacity fill no longer follows a group colour: with several groups enabled
+	// at once there is no single one to follow.
+	const resolvedSeriesColor = seriesColor ?? DEFAULT_HEATMAP_COLORS.fill;
+
+	// Opacity mode keeps the solid fill; a partially transparent marker is hard to
+	// read against the panel.
+	const extremeColor = resolveExtremeColor({
+		options: colors,
+		isDarkMode,
+		seriesColor: resolvedSeriesColor,
+	});
+
+	const {
+		visibleGroups,
+		focusedSeriesIndex,
+		onLegendClick,
+		onLegendMouseMove,
+		onLegendMouseLeave,
+	} = useHeatmapGroupLegend({ groups });
+
+	const grid = useMemo(
+		() => resolveHeatmapGrid({ buckets, step, series, visibleGroups }),
+		[buckets, step, series, visibleGroups],
+	);
+
+	const yAxis = useMemo(
+		() => resolveHeatmapYAxis(grid.bounds, axisScale),
+		[grid.bounds, axisScale],
+	);
+
+	const hasGrid = yAxis.rows.length > 0 && grid.timestamps.length > 0;
+
+	const data = useMemo(
+		() =>
+			hasGrid
+				? prepareHeatmapChartData(grid, yAxis.rows.length)
+				: ([[]] as unknown as ReturnType<typeof prepareHeatmapChartData>),
+		[grid, yAxis.rows.length, hasGrid],
+	);
+
+	const colorResolver = useMemo(
+		() =>
+			createHeatmapColorResolver({
+				options: colors,
+				domain: resolveCountDomain(colors, grid.counts),
+				isDarkMode,
+				seriesColor: resolvedSeriesColor,
+			}),
+		[colors, grid.counts, isDarkMode, resolvedSeriesColor],
+	);
+
+	// Stable: the renderer captures it at config-build time, so a new identity would
+	// recreate the plot on every hover.
+	const handleHoverChange = useCallback((cell: HeatmapCell | null): void => {
+		hoveredCellRef.current = cell;
+		setHoveredCell(cell);
+	}, []);
+
+	const config = useMemo(
+		() =>
+			buildHeatmapConfig({
+				id,
+				grid,
+				yAxis,
+				colors,
+				isDarkMode,
+				seriesColor: resolvedSeriesColor,
+				dimOnHover,
+				onHoverChange: handleHoverChange,
+				yAxisUnit,
+				decimalPrecision,
+				timezone,
+				minTimeScale,
+				maxTimeScale,
+				onDragSelect,
+			}),
+		[
+			id,
+			grid,
+			yAxis,
+			colors,
+			isDarkMode,
+			resolvedSeriesColor,
+			dimOnHover,
+			handleHoverChange,
+			yAxisUnit,
+			decimalPrecision,
+			timezone,
+			minTimeScale,
+			maxTimeScale,
+			onDragSelect,
+		],
+	);
+
+	// Each marker takes the ramp colour for where that group's densest cell falls on
+	// the colour bar, so a swatch reads against the same scale as the grid.
+	const groupPeaks = useMemo(() => resolveGroupPeaks(series), [series]);
+	const isPaletteMode = colors.mode === HeatmapColorMode.Palette;
+
+	const legendItems = useMemo<LegendItem[]>(
+		() =>
+			groups.map((group, index) => ({
+				// +1 mirrors uPlot's 1-based data series, so the shared legend's index
+				// handling is identical across charts.
+				seriesIndex: index + 1,
+				label: group,
+				color: isPaletteMode
+					? (colorResolver.colorFor(groupPeaks.get(group) ?? 0) ?? extremeColor)
+					: extremeColor,
+				show: visibleGroups.includes(group),
+			})),
+		[
+			groups,
+			visibleGroups,
+			isPaletteMode,
+			colorResolver,
+			groupPeaks,
+			extremeColor,
+		],
+	);
+
+	const renderTooltip = useCallback(
+		(args: TooltipRenderArgs): React.ReactNode => (
+			<HeatmapTooltip
+				{...args}
+				id={id}
+				yAxis={yAxis}
+				step={grid.step}
+				series={series}
+				visibleGroups={visibleGroups}
+				groupColor={extremeColor}
+				yAxisUnit={yAxisUnit}
+				decimalPrecision={decimalPrecision}
+				timezone={timezone}
+				canPinTooltip={canPinTooltip}
+				renderTooltipFooter={renderTooltipFooter}
+			/>
+		),
+		[
+			id,
+			yAxis,
+			grid.step,
+			series,
+			visibleGroups,
+			extremeColor,
+			yAxisUnit,
+			decimalPrecision,
+			timezone,
+			canPinTooltip,
+			renderTooltipFooter,
+		],
+	);
+
+	const handleClick = useCallback((clickData: ChartClickData): void => {
+		if (hoveredCellRef.current) {
+			onCellClickRef.current?.(hoveredCellRef.current, clickData);
+		}
+	}, []);
+
+	const groupLegend = useCallback(
+		(averageLegendWidth: number): React.ReactNode => (
+			<Legend
+				items={legendItems}
+				position={legendPosition}
+				averageLegendWidth={averageLegendWidth}
+				focusedSeriesIndex={focusedSeriesIndex}
+				onClick={onLegendClick}
+				onMouseMove={onLegendMouseMove}
+				onMouseLeave={onLegendMouseLeave}
+			/>
+		),
+		[
+			legendItems,
+			legendPosition,
+			focusedSeriesIndex,
+			onLegendClick,
+			onLegendMouseMove,
+			onLegendMouseLeave,
+		],
+	);
+
+	const visualMap = useMemo(() => {
+		if (!showVisualMap || !hasGrid) {
+			return null;
+		}
+		return (
+			<ColorBar
+				label="count"
+				ramp={colorResolver.ramp}
+				minLabel={colorResolver.domain.min.toLocaleString()}
+				maxLabel={colorResolver.domain.max.toLocaleString()}
+				markerPosition={colorResolver.positionOf(hoveredCell?.count ?? null)}
+			/>
+		);
+	}, [showVisualMap, hasGrid, colorResolver, hoveredCell]);
+
+	return (
+		<ChartWrapper
+			config={config}
+			data={data}
+			width={width}
+			height={
+				showVisualMap && hasGrid ? Math.max(0, height - COLOR_BAR_HEIGHT) : height
+			}
+			legendConfig={{ position: legendPosition }}
+			showLegend={hasGroupLegend}
+			customLegend={groupLegend}
+			legendLabels={groups}
+			showTooltip={showTooltip}
+			canPinTooltip={canPinTooltip}
+			pinKey={pinKey}
+			onClick={onCellClick ? handleClick : undefined}
+			yAxisUnit={yAxisUnit}
+			decimalPrecision={decimalPrecision}
+			customTooltip={renderTooltip}
+			renderTooltipFooter={renderTooltipFooter}
+			tooltipPortalRoot={tooltipPortalRoot}
+			contentFooter={visualMap}
+			layoutChildren={layoutChildren}
+			data-testid={testId}
+		/>
+	);
+}

frontend/src/lib/visualization/charts/Heatmap/__tests__/Heatmap.test.tsx

@@ -0,0 +1,252 @@
+import type React from 'react';
+import userEvent from '@testing-library/user-event';
+import type { LegendItem } from 'lib/uPlotV2/config/types';
+import { render, screen } from 'tests/test-utils';
+import {
+	createHeatmapColorResolver,
+	DEFAULT_HEATMAP_COLORS,
+	resolveCountDomain,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/colorScale';
+import { resolveHeatmapGrid } from 'lib/uPlotV2/plugins/HeatmapPlugin/grid';
+import {
+	HeatmapColorMode,
+	HeatmapSeries,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+
+import Heatmap from '../Heatmap';
+
+// The shared Legend virtualises its items; render them all so they are queryable.
+jest.mock('react-virtuoso', () => ({
+	VirtuosoGrid: ({
+		data,
+		itemContent,
+	}: {
+		data: LegendItem[];
+		itemContent: (index: number, item: LegendItem) => React.ReactNode;
+	}): JSX.Element => (
+		<div>
+			{data.map((item, index) => (
+				<div key={item.seriesIndex}>{itemContent(index, item)}</div>
+			))}
+		</div>
+	),
+}));
+
+const BUCKETS = [128, 256, 1024];
+const STEP = 60;
+
+/** Two groups whose counts sum to a peak of 1,204 in the combined view. */
+const SERIES: HeatmapSeries[] = [
+	{
+		label: 'service.name=cart',
+		points: [
+			{ timestamp: 1000, counts: [1, 4, 7, 10] },
+			{ timestamp: 1060, counts: [2, null, 8, 11] },
+			{ timestamp: 1120, counts: [3, 6, 9, 1200] },
+		],
+	},
+	{
+		label: 'service.name=checkout',
+		points: [{ timestamp: 1120, counts: [0, 0, 0, 4] }],
+	},
+];
+
+function renderHeatmap(
+	props: Partial<React.ComponentProps<typeof Heatmap>> = {},
+): ReturnType<typeof render> {
+	return render(
+		<Heatmap
+			id="panel-1"
+			buckets={BUCKETS}
+			step={STEP}
+			series={SERIES}
+			width={800}
+			height={400}
+			isDarkMode
+			data-testid="heatmap"
+			{...props}
+		/>,
+	);
+}
+
+describe('Heatmap', () => {
+	it('renders the plot container', () => {
+		renderHeatmap();
+
+		expect(screen.getByTestId('heatmap')).toBeInTheDocument();
+	});
+
+	it('shows the colour bar with the resolved count domain', () => {
+		renderHeatmap();
+
+		expect(screen.getByTestId('color-bar')).toBeInTheDocument();
+		expect(screen.getByText('0')).toBeInTheDocument();
+		expect(screen.getByText('1,204')).toBeInTheDocument();
+	});
+
+	it('puts the colour bar against the plot, with the legend after it', () => {
+		renderHeatmap();
+
+		const bar = screen.getByTestId('color-bar');
+		const legend = screen.getByText('service.name=cart').closest('.legend-item');
+		// The bar is the scale key for the grid, so it reads before the controls.
+		expect(
+			bar.compareDocumentPosition(legend as Node) &
+				Node.DOCUMENT_POSITION_FOLLOWING,
+		).toBeTruthy();
+	});
+
+	it('keeps the colour bar inside the chart column, not below the legend', () => {
+		renderHeatmap();
+
+		expect(
+			screen.getByTestId('color-bar').closest('.chart-layout__content'),
+		).not.toBeNull();
+	});
+
+	it('hides the colour bar when the visual map is off', () => {
+		renderHeatmap({ showVisualMap: false });
+
+		expect(screen.queryByTestId('color-bar')).not.toBeInTheDocument();
+	});
+
+	it('labels the colour bar with an explicit clamp instead of the data range', () => {
+		renderHeatmap({ colors: { minCount: 5, maxCount: 500 } });
+
+		expect(screen.getByText('5')).toBeInTheDocument();
+		expect(screen.getByText('500')).toBeInTheDocument();
+	});
+
+	it('falls back to the no-data state when the metric has no buckets', () => {
+		renderHeatmap({ buckets: [] });
+
+		expect(screen.getByText('No Data')).toBeInTheDocument();
+		expect(screen.queryByTestId('color-bar')).not.toBeInTheDocument();
+	});
+
+	it('falls back to the no-data state when no columns came back', () => {
+		renderHeatmap({ series: [] });
+
+		expect(screen.getByText('No Data')).toBeInTheDocument();
+	});
+});
+
+describe('Heatmap group legend', () => {
+	const CART = 'service.name=cart';
+	const CHECKOUT = 'service.name=checkout';
+
+	function legendItem(label: string): HTMLElement {
+		const item = screen.getByText(label).closest('.legend-item');
+		if (!item) {
+			throw new Error(`no legend item for ${label}`);
+		}
+		return item as HTMLElement;
+	}
+
+	function marker(label: string): HTMLElement {
+		const element = legendItem(label).querySelector<HTMLElement>(
+			'[data-is-legend-marker]',
+		);
+		if (!element) {
+			throw new Error(`no marker for ${label}`);
+		}
+		return element;
+	}
+
+	it('lists the groups, with no combined-view entry', () => {
+		renderHeatmap();
+
+		expect(screen.getByText(CART)).toBeInTheDocument();
+		expect(screen.getByText(CHECKOUT)).toBeInTheDocument();
+		expect(screen.queryByText(/all groups/i)).not.toBeInTheDocument();
+	});
+
+	it('enables every group to begin with', () => {
+		renderHeatmap();
+
+		expect(legendItem(CART)).not.toHaveClass('legend-item-off');
+		expect(legendItem(CHECKOUT)).not.toHaveClass('legend-item-off');
+	});
+
+	it('isolates a group when its label is clicked', async () => {
+		renderHeatmap();
+
+		await userEvent.click(screen.getByText(CART));
+
+		expect(legendItem(CART)).not.toHaveClass('legend-item-off');
+		expect(legendItem(CHECKOUT)).toHaveClass('legend-item-off');
+	});
+
+	it('restores every group when the isolated label is clicked again', async () => {
+		renderHeatmap();
+
+		await userEvent.click(screen.getByText(CART));
+		await userEvent.click(screen.getByText(CART));
+
+		expect(legendItem(CHECKOUT)).not.toHaveClass('legend-item-off');
+	});
+
+	it('excludes just one group when its marker is clicked', async () => {
+		renderHeatmap();
+
+		await userEvent.click(marker(CHECKOUT));
+
+		expect(legendItem(CHECKOUT)).toHaveClass('legend-item-off');
+		expect(legendItem(CART)).not.toHaveClass('legend-item-off');
+	});
+
+	/** The ramp the cells and colour bar are drawn from, for the default options. */
+	function activeRamp(): string[] {
+		const grid = resolveHeatmapGrid({
+			buckets: BUCKETS,
+			step: STEP,
+			series: SERIES,
+		});
+		return createHeatmapColorResolver({
+			options: DEFAULT_HEATMAP_COLORS,
+			domain: resolveCountDomain(DEFAULT_HEATMAP_COLORS, grid.counts),
+			isDarkMode: true,
+			seriesColor: DEFAULT_HEATMAP_COLORS.fill,
+		}).ramp.map((color) => color.toLowerCase());
+	}
+
+	it('places each marker where its group sits on the colour bar', () => {
+		renderHeatmap();
+		const ramp = activeRamp();
+
+		// cart peaks at 1200, checkout at 4, so cart sits further along the ramp.
+		// The DOM lowercases hex; the ramp is built uppercase.
+		const cart = ramp.indexOf(marker(CART).style.borderColor.toLowerCase());
+		const checkout = ramp.indexOf(
+			marker(CHECKOUT).style.borderColor.toLowerCase(),
+		);
+
+		expect(cart).toBeGreaterThan(-1);
+		expect(checkout).toBeGreaterThan(-1);
+		expect(cart).toBeGreaterThan(checkout);
+	});
+
+	it('gives every marker the solid fill in opacity mode', () => {
+		renderHeatmap({
+			colors: { mode: HeatmapColorMode.Opacity, fill: '#e5484d' },
+		});
+
+		// A partially transparent marker is hard to read against the panel.
+		expect(marker(CART).style.borderColor).toBe(
+			marker(CHECKOUT).style.borderColor,
+		);
+		expect(marker(CART).style.borderColor).not.toBe('');
+	});
+
+	it('hides the legend when there is only one group to choose from', () => {
+		renderHeatmap({ series: [SERIES[0]] });
+
+		expect(screen.queryByText(CART)).not.toBeInTheDocument();
+	});
+
+	it('hides the legend when asked', () => {
+		renderHeatmap({ showLegend: false });
+
+		expect(screen.queryByText(CART)).not.toBeInTheDocument();
+	});
+});

frontend/src/lib/visualization/charts/Heatmap/__tests__/useHeatmapGroupLegend.test.ts

@@ -0,0 +1,147 @@
+import { act, renderHook } from '@testing-library/react';
+import type { MouseEvent } from 'react';
+
+import { useHeatmapGroupLegend } from '../useHeatmapGroupLegend';
+
+const GROUPS = ['cart', 'checkout', 'payments'];
+
+/** Mimics a click on an item's label, as the shared Legend renders it. */
+function labelClick(seriesIndex: number): MouseEvent<HTMLDivElement> {
+	const wrapper = document.createElement('div');
+	wrapper.setAttribute('data-legend-item-id', String(seriesIndex));
+	const label = document.createElement('span');
+	wrapper.appendChild(label);
+	return { target: label } as unknown as MouseEvent<HTMLDivElement>;
+}
+
+/** Mimics a click on the item's marker circle. */
+function markerClick(seriesIndex: number): MouseEvent<HTMLDivElement> {
+	const wrapper = document.createElement('div');
+	wrapper.setAttribute('data-legend-item-id', String(seriesIndex));
+	const marker = document.createElement('div');
+	marker.dataset.isLegendMarker = 'true';
+	wrapper.appendChild(marker);
+	return { target: marker } as unknown as MouseEvent<HTMLDivElement>;
+}
+
+function render(
+	groups: string[] = GROUPS,
+): ReturnType<
+	typeof renderHook<ReturnType<typeof useHeatmapGroupLegend>, unknown>
+> {
+	return renderHook(() => useHeatmapGroupLegend({ groups }));
+}
+
+describe('useHeatmapGroupLegend', () => {
+	it('enables every group to begin with', () => {
+		const { result } = render();
+
+		expect(result.current.visibleGroups).toStrictEqual(GROUPS);
+	});
+
+	it('isolates a group when its label is clicked', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(labelClick(2)));
+
+		expect(result.current.visibleGroups).toStrictEqual(['checkout']);
+	});
+
+	it('restores every group when the isolated label is clicked again', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(labelClick(2)));
+		act(() => result.current.onLegendClick(labelClick(2)));
+
+		expect(result.current.visibleGroups).toStrictEqual(GROUPS);
+	});
+
+	it('moves the isolation when a different label is clicked', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(labelClick(1)));
+		act(() => result.current.onLegendClick(labelClick(3)));
+
+		expect(result.current.visibleGroups).toStrictEqual(['payments']);
+	});
+
+	it('excludes just one group when its marker is clicked', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(markerClick(2)));
+
+		expect(result.current.visibleGroups).toStrictEqual(['cart', 'payments']);
+	});
+
+	it('re-includes a group when its marker is clicked again', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(markerClick(2)));
+		act(() => result.current.onLegendClick(markerClick(2)));
+
+		expect(result.current.visibleGroups).toStrictEqual(GROUPS);
+	});
+
+	it('excludes more than one group', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(markerClick(1)));
+		act(() => result.current.onLegendClick(markerClick(3)));
+
+		expect(result.current.visibleGroups).toStrictEqual(['checkout']);
+	});
+
+	it('drops the isolation when a marker is clicked, so the label can isolate again', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendClick(labelClick(1)));
+		// Re-including cart by marker leaves it enabled but no longer isolated.
+		act(() => result.current.onLegendClick(markerClick(2)));
+		act(() => result.current.onLegendClick(labelClick(1)));
+
+		expect(result.current.visibleGroups).toStrictEqual(['cart']);
+	});
+
+	it('allows every group to be excluded, as the other legends do', () => {
+		const { result } = render();
+
+		GROUPS.forEach((_, index) =>
+			act(() => result.current.onLegendClick(markerClick(index + 1))),
+		);
+
+		expect(result.current.visibleGroups).toStrictEqual([]);
+	});
+
+	it('ignores clicks that miss an entry', () => {
+		const { result } = render();
+		const stray = {
+			target: document.createElement('div'),
+		} as unknown as MouseEvent<HTMLDivElement>;
+
+		act(() => result.current.onLegendClick(stray));
+
+		expect(result.current.visibleGroups).toStrictEqual(GROUPS);
+	});
+
+	it('forgets a hidden group that left the result', () => {
+		const { result, rerender } = renderHook(
+			({ groups }) => useHeatmapGroupLegend({ groups }),
+			{ initialProps: { groups: GROUPS } },
+		);
+
+		act(() => result.current.onLegendClick(markerClick(3)));
+		rerender({ groups: ['cart', 'checkout'] });
+
+		expect(result.current.visibleGroups).toStrictEqual(['cart', 'checkout']);
+	});
+
+	it('tracks the hovered entry for the legend"s focus highlight', () => {
+		const { result } = render();
+
+		act(() => result.current.onLegendMouseMove(labelClick(2)));
+		expect(result.current.focusedSeriesIndex).toBe(2);
+
+		act(() => result.current.onLegendMouseLeave());
+		expect(result.current.focusedSeriesIndex).toBeNull();
+	});
+});

frontend/src/lib/visualization/charts/Heatmap/__tests__/utils.test.ts

@@ -0,0 +1,195 @@
+import { resolveHeatmapYAxis } from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import { DEFAULT_HEATMAP_COLORS } from 'lib/uPlotV2/plugins/HeatmapPlugin/colorScale';
+import {
+	HeatmapAxisScale,
+	HeatmapGrid,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+import type uPlot from 'uplot';
+
+import { buildHeatmapConfig, prepareHeatmapChartData } from '../utils';
+
+const GRID: HeatmapGrid = {
+	bounds: [128, 256, 1024],
+	timestamps: [1000, 1060, 1120],
+	step: 60,
+	counts: [
+		[1, 2, 3],
+		[4, null, 6],
+		[7, 8, 9],
+		[0, 0, 0],
+	],
+};
+
+const Y_AXIS = resolveHeatmapYAxis(GRID.bounds, HeatmapAxisScale.Log);
+
+/** Tall enough that no tick needs thinning. */
+const TALL_PLOT = { bbox: { height: 1000 } } as uPlot;
+
+function readSplits(
+	config: ReturnType<typeof buildHeatmapConfig>,
+	plot: uPlot,
+): number[] {
+	const [, yAxisConfig] = config.getConfig().axes ?? [];
+	return (yAxisConfig.splits as (self: uPlot) => number[])(plot);
+}
+
+function readLabels(
+	config: ReturnType<typeof buildHeatmapConfig>,
+	splits: number[],
+): string[] {
+	const [, yAxisConfig] = config.getConfig().axes ?? [];
+	return (yAxisConfig.values as (u: uPlot, splits: number[]) => string[])(
+		{} as uPlot,
+		splits,
+	);
+}
+
+function readRange(scale?: uPlot.Scale): [number, number] {
+	const range = scale?.range as (
+		u: uPlot,
+		min: number,
+		max: number,
+	) => [number, number];
+	return range({} as uPlot, 0, 0);
+}
+
+function buildConfig(
+	overrides: Partial<Parameters<typeof buildHeatmapConfig>[0]> = {},
+): ReturnType<typeof buildHeatmapConfig> {
+	return buildHeatmapConfig({
+		id: 'panel-1',
+		grid: GRID,
+		yAxis: Y_AXIS,
+		colors: DEFAULT_HEATMAP_COLORS,
+		isDarkMode: true,
+		seriesColor: '#4e74f8',
+		...overrides,
+	});
+}
+
+describe('prepareHeatmapChartData', () => {
+	it('puts timestamps first and one series per bucket row', () => {
+		const data = prepareHeatmapChartData(GRID, Y_AXIS.rows.length);
+
+		expect(data).toHaveLength(Y_AXIS.rows.length + 1);
+		expect(data[0]).toStrictEqual(GRID.timestamps);
+		expect(data[1]).toStrictEqual([1, 2, 3]);
+	});
+
+	it('preserves null cells rather than zeroing them', () => {
+		const data = prepareHeatmapChartData(GRID, Y_AXIS.rows.length);
+
+		expect(data[2]).toStrictEqual([4, null, 6]);
+	});
+
+	it('pads short rows so every uPlot data array is the same length', () => {
+		const data = prepareHeatmapChartData(
+			{ ...GRID, counts: [[1]] },
+			Y_AXIS.rows.length,
+		);
+
+		expect(data[1]).toStrictEqual([1, null, null]);
+	});
+
+	it('pads missing rows up to the resolved row count', () => {
+		const data = prepareHeatmapChartData({ ...GRID, counts: [] }, 2);
+
+		expect(data).toHaveLength(3);
+		expect(data[2]).toStrictEqual([null, null, null]);
+	});
+});
+
+describe('buildHeatmapConfig', () => {
+	it('registers one series per bucket row, plus uPlot"s timestamp series', () => {
+		const config = buildHeatmapConfig({
+			id: 'panel-1',
+			grid: GRID,
+			yAxis: Y_AXIS,
+			colors: DEFAULT_HEATMAP_COLORS,
+			isDarkMode: true,
+			seriesColor: '#4e74f8',
+		}).getConfig();
+
+		expect(config.series).toHaveLength(Y_AXIS.rows.length + 1);
+	});
+
+	it('draws no paths or points per series — the renderer paints the cells', () => {
+		const [, firstRow] = buildConfig().getConfig().series ?? [];
+
+		expect((firstRow as uPlot.Series).paths?.({} as uPlot, 1, 0, 1)).toBeNull();
+		expect((firstRow as uPlot.Series).points?.show).toBe(false);
+	});
+
+	it('labels series by bucket range, including the open-ended rows', () => {
+		const labels = (buildConfig().getConfig().series ?? [])
+			.slice(1)
+			.map((series) => series.label);
+
+		expect(labels[0]).toContain('≤');
+		expect(labels[labels.length - 1]).toContain('>');
+	});
+
+	it('spans the x scale to the end of the last column, not its start', () => {
+		const { x } = buildConfig().getConfig().scales ?? {};
+
+		expect(readRange(x)).toStrictEqual([1000, 1180]);
+	});
+
+	it('prefers the query window over the grid extent', () => {
+		const { x } =
+			buildConfig({ minTimeScale: 900, maxTimeScale: 1500 }).getConfig().scales ??
+			{};
+
+		expect(readRange(x)).toStrictEqual([900, 1500]);
+	});
+
+	it('pins the y scale to the bucket axis instead of auto-ranging on counts', () => {
+		const { y } = buildConfig().getConfig().scales ?? {};
+
+		expect(y?.auto).toBe(false);
+		expect(readRange(y)).toStrictEqual([Y_AXIS.min, Y_AXIS.max]);
+	});
+
+	it('puts a y tick on every bucket boundary plus the overflow row"s upper edge', () => {
+		const splits = readSplits(buildConfig(), TALL_PLOT);
+
+		expect(splits).toStrictEqual([...Y_AXIS.splits, Y_AXIS.overflowSplit]);
+	});
+
+	it('labels the overflow edge as infinite and the rest by bucket value', () => {
+		const config = buildConfig();
+		const labels = readLabels(config, readSplits(config, TALL_PLOT));
+
+		expect(labels[0]).toBe('128');
+		expect(labels[labels.length - 1]).toBe('∞');
+	});
+
+	it('thins the tick set when the panel is too short to label every boundary', () => {
+		const config = buildConfig();
+		const splits = readSplits(config, { bbox: { height: 40 } } as uPlot);
+
+		expect(splits.length).toBeLessThan(Y_AXIS.splits.length + 1);
+		// The infinite edge is the one label that must never be dropped.
+		expect(readLabels(config, splits).at(-1)).toBe('∞');
+	});
+
+	it('disables uPlot cursor focus and points, which cannot read a colour axis', () => {
+		const config = buildConfig().getConfig();
+
+		expect(config.cursor?.focus?.prox).toBe(-1);
+		expect(config.cursor?.points?.show).toBe(false);
+	});
+
+	it('keeps focus alpha at 1 so focusing a row does not force a full redraw', () => {
+		expect(buildConfig().getConfig().focus?.alpha).toBe(1);
+	});
+
+	it('registers the renderer hooks', () => {
+		const { hooks } = buildConfig().getConfig();
+
+		expect(hooks?.init).toHaveLength(1);
+		expect(hooks?.draw).toHaveLength(1);
+		expect(hooks?.setCursor).toHaveLength(1);
+		expect(hooks?.destroy).toHaveLength(1);
+	});
+});

frontend/src/lib/visualization/charts/Heatmap/useHeatmapGroupLegend.ts

@@ -0,0 +1,100 @@
+import { MouseEvent, useCallback, useMemo, useRef, useState } from 'react';
+
+export interface UseHeatmapGroupLegendResult {
+	/** Groups currently enabled. The grid sums exactly these. */
+	visibleGroups: string[];
+	focusedSeriesIndex: number | null;
+	onLegendClick: (event: MouseEvent<HTMLDivElement>) => void;
+	onLegendMouseMove: (event: MouseEvent<HTMLDivElement>) => void;
+	onLegendMouseLeave: () => void;
+}
+
+/** The shared Legend tags each item and delegates interaction to the container. */
+function getLegendIndex(event: MouseEvent<HTMLDivElement>): number | null {
+	const element = (event.target as HTMLElement | null)?.closest<HTMLElement>(
+		'[data-legend-item-id]',
+	);
+	const id = element?.dataset.legendItemId;
+	return id === undefined ? null : Number(id);
+}
+
+function isMarkerClick(event: MouseEvent<HTMLDivElement>): boolean {
+	return Boolean((event.target as HTMLElement).dataset.isLegendMarker);
+}
+
+/**
+ * Group visibility for the heatmap legend, matching every other legend in the
+ * product: the label isolates a group, the marker excludes one, and everything is
+ * enabled to begin with. Counts are additive, so whatever is enabled is summed
+ * client-side and needs no extra request.
+ *
+ * Visibility only. Marker colour is resolved by the caller, which owns the colour
+ * ramp — and that ramp depends on which groups this hook has enabled.
+ */
+export function useHeatmapGroupLegend({
+	groups,
+}: {
+	groups: string[];
+}): UseHeatmapGroupLegendResult {
+	const [hidden, setHidden] = useState<Set<string>>(() => new Set());
+	const [focusedSeriesIndex, setFocusedSeriesIndex] = useState<number | null>(
+		null,
+	);
+	const isolatedRef = useRef<string | null>(null);
+
+	const visibleGroups = useMemo(
+		() => groups.filter((group) => !hidden.has(group)),
+		[groups, hidden],
+	);
+
+	const onLegendClick = useCallback(
+		(event: MouseEvent<HTMLDivElement>): void => {
+			const index = getLegendIndex(event);
+			const group = index === null ? undefined : groups[index - 1];
+			if (group === undefined) {
+				return;
+			}
+
+			if (isMarkerClick(event)) {
+				isolatedRef.current = null;
+				setHidden((previous) => {
+					const next = new Set(previous);
+					if (next.has(group)) {
+						next.delete(group);
+					} else {
+						next.add(group);
+					}
+					return next;
+				});
+				return;
+			}
+
+			// Label click isolates; clicking the isolated group again restores all.
+			const isReset = isolatedRef.current === group;
+			isolatedRef.current = isReset ? null : group;
+			setHidden(
+				isReset ? new Set() : new Set(groups.filter((entry) => entry !== group)),
+			);
+		},
+		[groups],
+	);
+
+	const onLegendMouseMove = useCallback(
+		(event: MouseEvent<HTMLDivElement>): void => {
+			setFocusedSeriesIndex(getLegendIndex(event));
+		},
+		[],
+	);
+
+	const onLegendMouseLeave = useCallback((): void => {
+		setFocusedSeriesIndex(null);
+	}, []);
+
+	return {
+		visibleGroups,
+		focusedSeriesIndex,
+		onLegendClick,
+		onLegendMouseMove,
+		onLegendMouseLeave,
+	};
+}

frontend/src/lib/visualization/charts/Heatmap/utils.ts

@@ -0,0 +1,193 @@
+import { Timezone } from 'components/CustomTimePicker/timezoneUtils';
+import { PrecisionOption } from 'components/Graph/types';
+import { getToolTipValue } from 'components/Graph/yAxisConfig';
+import { uPlotXAxisValuesFormat } from 'lib/uPlotLib/utils/constants';
+import { DrawStyle } from 'lib/uPlotV2/config/types';
+import { UPlotConfigBuilder } from 'lib/uPlotV2/config/UPlotConfigBuilder';
+import {
+	decimateAxisSplits,
+	formatRowLabel,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import {
+	createHeatmapHooks,
+	HeatmapRenderOptions,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/heatmapPlugin';
+import { HeatmapGrid } from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+import uPlot from 'uplot';
+
+/** Minimum gap between y tick labels, in CSS pixels. */
+const MIN_Y_TICK_GAP_PX = 18;
+
+/** Label for the edge above the overflow row. */
+const OVERFLOW_AXIS_LABEL = '∞';
+
+/**
+ * Flattens the grid into `[timestamps, ...rows]`, one series per bucket row so
+ * `setData` handles refetches. The series draw nothing; the renderer paints cells.
+ *
+ * Rows are padded to `rowCount` — which can differ from `bounds.length + 1` when
+ * the response carried duplicate boundaries — since uPlot requires equal lengths.
+ */
+export function prepareHeatmapChartData(
+	grid: HeatmapGrid,
+	rowCount: number,
+): uPlot.AlignedData {
+	const columnCount = grid.timestamps.length;
+	const rows = Array.from({ length: rowCount }, (_, row) => {
+		const counts = grid.counts[row] ?? [];
+		return Array.from({ length: columnCount }, (_, column) =>
+			counts[column] === undefined ? null : counts[column],
+		);
+	});
+
+	return [grid.timestamps, ...rows] as unknown as uPlot.AlignedData;
+}
+
+export interface BuildHeatmapConfigArgs extends Omit<
+	HeatmapRenderOptions,
+	'step'
+> {
+	id: string;
+	grid: HeatmapGrid;
+	/** Unit of the bucket boundaries; counts are never formatted with it. */
+	yAxisUnit?: string;
+	decimalPrecision?: PrecisionOption;
+	timezone?: Timezone;
+	/** Query window, in seconds. Falls back to the grid's own extent. */
+	minTimeScale?: number;
+	maxTimeScale?: number;
+	onDragSelect?: (startTime: number, endTime: number) => void;
+}
+
+export function buildHeatmapConfig({
+	id,
+	grid,
+	yAxis,
+	colors,
+	isDarkMode,
+	seriesColor,
+	dimOnHover,
+	onHoverChange,
+	yAxisUnit,
+	decimalPrecision,
+	timezone,
+	minTimeScale,
+	maxTimeScale,
+	onDragSelect,
+}: BuildHeatmapConfigArgs): UPlotConfigBuilder {
+	const tzDate = timezone
+		? (timestamp: number): Date =>
+				uPlot.tzDate(new Date(timestamp * 1e3), timezone.value)
+		: undefined;
+
+	const builder = new UPlotConfigBuilder({ id, onDragSelect, tzDate });
+
+	// uPlot's focus picks the series closest in value space, meaningless when the
+	// value is a colour; the renderer focuses the hovered row itself. alpha 1 keeps
+	// that call off uPlot's full-redraw path.
+	builder.setFocus({ alpha: 1 });
+	builder.setCursor({ focus: { prox: -1 }, points: { show: false } });
+
+	const formatBucketValue = (value: number): string =>
+		getToolTipValue(String(value), yAxisUnit, decimalPrecision);
+
+	const lastTimestamp = grid.timestamps[grid.timestamps.length - 1] ?? 0;
+	const xRange: [number, number] = [
+		minTimeScale ?? grid.timestamps[0] ?? 0,
+		maxTimeScale ?? lastTimestamp + grid.step,
+	];
+
+	builder.addScale({
+		scaleKey: 'x',
+		time: true,
+		range: (): [number, number] => xRange,
+	});
+	builder.addScale({
+		scaleKey: 'y',
+		time: false,
+		auto: false,
+		range: (): [number, number] => [yAxis.min, yAxis.max],
+	});
+
+	builder.addAxis({
+		scaleKey: 'x',
+		side: 2,
+		isDarkMode,
+		values: uPlotXAxisValuesFormat as uPlot.Axis.Values,
+	});
+
+	// Ticks sit on row edges, so the overflow row is the band between the last
+	// boundary and `∞`. A centre label would sit half a row from the boundary tick
+	// and collide with it.
+	const overflowRow = yAxis.rows[yAxis.rows.length - 1];
+	const hasOverflowTick =
+		yAxis.overflowSplit !== null && overflowRow?.isOverflow === true;
+	const axisSplits = hasOverflowTick
+		? [...yAxis.splits, yAxis.overflowSplit as number]
+		: yAxis.splits;
+
+	// From the boundaries themselves, not by inverting the transform:
+	// 10 ** Math.log10(128) is 127.999…, which formats as "127.99".
+	const splitLabels = new Map<number, string>();
+	yAxis.splits.forEach((split, index) => {
+		splitLabels.set(split, formatBucketValue(yAxis.rows[index].upper));
+	});
+	if (hasOverflowTick) {
+		splitLabels.set(yAxis.overflowSplit as number, OVERFLOW_AXIS_LABEL);
+	}
+
+	builder.addAxis({
+		scaleKey: 'y',
+		side: 3,
+		isDarkMode,
+		yAxisUnit,
+		decimalPrecision,
+		// Thinned to whatever fits: a histogram can carry more boundaries than the
+		// panel has room to label.
+		splits: (self): number[] =>
+			decimateAxisSplits({
+				splits: axisSplits,
+				min: yAxis.min,
+				max: yAxis.max,
+				plotHeight: self.bbox.height / uPlot.pxRatio,
+				minGapPx: MIN_Y_TICK_GAP_PX,
+			}),
+		values: (_, splits): string[] =>
+			splits.map(
+				(split) =>
+					splitLabels.get(split) ?? formatBucketValue(yAxis.toBucketValue(split)),
+			),
+	});
+
+	yAxis.rows.forEach((row) => {
+		builder.addSeries({
+			scaleKey: 'y',
+			// Nothing is stroked per series; the draw hook paints the grid.
+			drawStyle: DrawStyle.Line,
+			pathBuilder: (): null => null,
+			showPoints: false,
+			spanGaps: false,
+			label: formatRowLabel(row, formatBucketValue),
+			colorMapping: {},
+			isDarkMode,
+		});
+	});
+
+	const hooks = createHeatmapHooks({
+		yAxis,
+		step: grid.step,
+		colors,
+		isDarkMode,
+		seriesColor,
+		dimOnHover,
+		onHoverChange,
+	});
+
+	// Order matters — see the HeatmapHooks doc comment.
+	builder.addHook('init', hooks.init);
+	builder.addHook('draw', hooks.draw);
+	builder.addHook('setCursor', hooks.setCursor);
+	builder.addHook('destroy', hooks.destroy);
+
+	return builder;
+}

frontend/src/lib/visualization/charts/types.ts

@@ -9,6 +9,12 @@ import {
 	TooltipRenderArgs,
 } from 'lib/uPlotV2/components/types';
 import { UPlotConfigBuilder } from 'lib/uPlotV2/config/UPlotConfigBuilder';
+import type {
+	HeatmapAxisScale,
+	HeatmapCell,
+	HeatmapColorOptions,
+	HeatmapSeries,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
 import {
 	DashboardCursorSync,
 	SyncTooltipFilterMode,
@@ -33,6 +39,13 @@ interface BaseChartProps {
 	renderTooltipFooter?: (args: IRenderTooltipFooterArgs) => React.ReactNode;
 	customTooltip?: (props: TooltipRenderArgs) => React.ReactNode;
 	tooltipPortalRoot?: HTMLElement | null;
+	/** Replaces the config-driven legend, for charts whose legend lists something
+	 *  other than uPlot series — heatmap groups, where the series are bucket rows. */
+	customLegend?: (averageLegendWidth: number) => React.ReactNode;
+	/** Measured against for the chart/legend split. Pair with `customLegend`. */
+	legendLabels?: string[];
+	/** Rendered under the plot but above the legend, inside the chart column. */
+	contentFooter?: React.ReactNode;
 	'data-testid'?: string;
 }
 interface UPlotBasedChartProps {
@@ -74,6 +87,60 @@ export interface HistogramChartProps extends ChartWrapperProps {
 	isQueriesMerged?: boolean;
 }
 
+/**
+ * Data arrives as the query response carries it — bucket bounds plus one series per
+ * group — and the chart pivots and sums it, so no caller has to get the transpose
+ * or the combined view right. It builds its own `UPlotConfigBuilder` too, since the
+ * y axis *is* the bucket axis and `buckets` fully determines it.
+ *
+ * `buckets`, `series` and `colors` must be referentially stable: a new identity
+ * rebuilds the config, which recreates the plot.
+ */
+export interface HeatmapChartProps {
+	id: string;
+	/** Ascending. N boundaries describe N+1 rows. */
+	buckets: number[];
+	/** The *effective* step the server used (`meta.stepIntervals[queryName]`), not
+	 *  the requested one. Cannot be inferred: the last column has no successor. */
+	step: number;
+	/** One entry per group; a query without grouping yields one series. */
+	series: HeatmapSeries[];
+	width: number;
+	height: number;
+	isDarkMode: boolean;
+	/** Overrides on top of `DEFAULT_HEATMAP_COLORS`. */
+	colors?: Partial<HeatmapColorOptions>;
+	/** Default log. */
+	axisScale?: HeatmapAxisScale;
+	/** Unit of the bucket boundaries; counts are always plain numbers. */
+	yAxisUnit?: string;
+	decimalPrecision?: PrecisionOption;
+	timezone?: Timezone;
+	/** Colour bar below the grid. Default true. */
+	showVisualMap?: boolean;
+	/** Default true; hidden anyway when there is only one group. Every group starts
+	 *  enabled — the label isolates one, the marker excludes one. */
+	showLegend?: boolean;
+	legendPosition?: LegendPosition;
+	/** Default true. */
+	dimOnHover?: boolean;
+	showTooltip?: boolean;
+	canPinTooltip?: boolean;
+	pinKey?: string;
+	/** Overrides the opacity-mode fill, which otherwise follows the selected
+	 *  group's legend colour so the grid matches the swatch that was clicked. */
+	seriesColor?: string;
+	/** Query window, in seconds. Falls back to the data's own extent. */
+	minTimeScale?: number;
+	maxTimeScale?: number;
+	onDragSelect?: (startTime: number, endTime: number) => void;
+	onCellClick?: (cell: HeatmapCell, clickData: ChartClickData) => void;
+	renderTooltipFooter?: (args: IRenderTooltipFooterArgs) => React.ReactNode;
+	tooltipPortalRoot?: HTMLElement | null;
+	layoutChildren?: React.ReactNode;
+	'data-testid'?: string;
+}
+
 /**
  * One resolved pie/donut slice: a display label, its (already parsed) positive
  * numeric value, and the colour used for the arc + legend swatch.

frontend/src/lib/visualization/layout/ChartLayout/ChartLayout.tsx

@@ -16,20 +16,31 @@ export interface ChartLayoutProps {
 		averageLegendWidth: number;
 	}) => React.ReactNode;
 	layoutChildren?: React.ReactNode;
+	/**
+	 * Rendered directly under the plot, inside the chart column — so it stays next to
+	 * the axis with the legend below it, and beside a RIGHT legend rather than under
+	 * it. `layoutChildren` sits below everything instead.
+	 */
+	contentFooter?: React.ReactNode;
 	containerWidth: number;
 	containerHeight: number;
 	legendConfig: LegendConfig;
 	config: UPlotConfigBuilder;
+	/** Defaults to the chart's series labels. Pass them when the legend lists
+	 *  something else, or the split is measured against the wrong text. */
+	seriesLabels?: string[];
 }
 export default function ChartLayout({
 	showLegend = true,
 	legendComponent,
 	children,
 	layoutChildren,
+	contentFooter,
 	containerWidth,
 	containerHeight,
 	legendConfig,
 	config,
+	seriesLabels,
 }: ChartLayoutProps): JSX.Element {
 	const chartDimensions = useMemo(
 		() => {
@@ -42,19 +53,20 @@ export default function ChartLayout({
 					averageLegendWidth: MAX_LEGEND_WIDTH,
 				};
 			}
-			const legendItemsMap = config.getLegendItems();
-			const seriesLabels = Object.values(legendItemsMap)
-				.map((item) => item.label)
-				.filter((label): label is string => label !== undefined);
+			const resolvedLabels =
+				seriesLabels ??
+				Object.values(config.getLegendItems())
+					.map((item) => item.label)
+					.filter((label): label is string => label !== undefined);
 			return calculateChartDimensions({
 				containerWidth,
 				containerHeight,
 				legendConfig,
-				seriesLabels,
+				seriesLabels: resolvedLabels,
 			});
 		},
 		// eslint-disable-next-line react-hooks/exhaustive-deps
-		[containerWidth, containerHeight, legendConfig, showLegend],
+		[containerWidth, containerHeight, legendConfig, showLegend, seriesLabels],
 	);
 
 	return (
@@ -72,6 +84,7 @@ export default function ChartLayout({
 						chartHeight: chartDimensions.height,
 						averageLegendWidth: chartDimensions.averageLegendWidth,
 					})}
+					{contentFooter}
 				</div>
 				{showLegend && (
 					<div

frontend/src/lib/visualization/panels/utils/baseConfigBuilder.ts

@@ -14,6 +14,7 @@ import { MetricRangePayloadProps } from 'types/api/metrics/getQueryRange';
 import uPlot from 'uplot';
 
 import { PanelMode } from 'lib/visualization/panels/types';
+import { plotsTimeOnXAxis } from 'lib/visualization/panels/utils/panelAxis';
 
 export interface BaseConfigBuilderProps {
 	id: string;
@@ -124,7 +125,7 @@ export function buildBaseConfig({
 		side: 2,
 		isDarkMode,
 		isLogScale,
-		panelType,
+		isTimeAxis: plotsTimeOnXAxis(panelType),
 	});
 
 	builder.addAxis({
@@ -134,7 +135,6 @@ export function buildBaseConfig({
 		isDarkMode,
 		isLogScale,
 		yAxisUnit,
-		panelType,
 	});
 
 	return builder;

frontend/src/lib/visualization/panels/utils/panelAxis.ts

@@ -0,0 +1,9 @@
+import { PANEL_TYPES } from 'constants/queryBuilder';
+
+/**
+ * Whether the panel type plots time on X. Graph and bar do; the rest drawn through
+ * `buildBaseConfig` — histogram buckets, billing categories — plot a value there instead.
+ */
+export function plotsTimeOnXAxis(panelType: PANEL_TYPES): boolean {
+	return panelType === PANEL_TYPES.TIME_SERIES || panelType === PANEL_TYPES.BAR;
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PanelEditorQueryBuilder/PanelEditorQueryBuilder.tsx

@@ -13,7 +13,6 @@ import type { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.sche
 import PromQLIcon from 'assets/Dashboard/PromQl';
 import { QueryBuilderV2 } from 'components/QueryBuilderV2/QueryBuilderV2';
 import TextToolTip from 'components/TextToolTip';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import ClickHouseQueryContainer from 'container/QueryBuilder/rawQueryEditors/ClickHouse';
 import PromQLQueryContainer from 'container/QueryBuilder/rawQueryEditors/PromQL';
 import RunQueryBtn from 'container/QueryBuilder/components/RunQueryBtn/RunQueryBtn';
@@ -64,8 +63,12 @@ function PanelEditorQueryBuilder({
 	footer,
 	stickyHeader = true,
 }: PanelEditorQueryBuilderProps): JSX.Element {
-	// The shared QueryBuilderV2 / list-view checks still speak the legacy PANEL_TYPES.
+	// The shared QueryBuilderV2 provider still speaks the legacy PANEL_TYPES; what the
+	// builder offers for this kind comes from the kind's own declaration.
 	const panelType = PANEL_KIND_TO_PANEL_TYPE[panelKind];
+	// Raw rows: the builder drops its aggregation controls, and with them the trace
+	// operator that combines aggregated trace queries (V1 parity).
+	const isListViewPanel = panelKind === 'signoz/ListPanel';
 	const { currentQuery, redirectWithQueryBuilderData } = useQueryBuilder();
 	const isDarkMode = useIsDarkMode();
 
@@ -112,9 +115,9 @@ function PanelEditorQueryBuilder({
 						<QueryBuilderV2
 							panelType={panelType}
 							filterConfigs={filterConfigs}
-							showTraceOperator={panelType !== PANEL_TYPES.LIST}
+							showTraceOperator={!isListViewPanel}
 							version="v3"
-							isListViewPanel={panelType === PANEL_TYPES.LIST}
+							isListViewPanel={isListViewPanel}
 							queryComponents={{}}
 							signalSourceChangeEnabled
 							savePreviousQuery
@@ -148,7 +151,7 @@ function PanelEditorQueryBuilder({
 			),
 			children: queryTypeComponents[queryType].component,
 		}));
-	}, [panelKind, panelType, filterConfigs, isDarkMode]);
+	}, [panelKind, panelType, filterConfigs, isDarkMode, isListViewPanel]);
 
 	return (
 		<div

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PanelEditorQueryBuilder/__tests__/PanelEditorQueryBuilder.test.tsx

@@ -60,6 +60,7 @@ function renderBuilder(
 function lastQueryBuilderProps(): {
 	panelType: string;
 	isListViewPanel: boolean;
+	showTraceOperator: boolean;
 	filterConfigs: unknown;
 } {
 	const calls = mockQueryBuilderV2.mock.calls;
@@ -115,6 +116,9 @@ describe('PanelEditorQueryBuilder field visibility (driven by the capabilities g
 		const props = lastQueryBuilderProps();
 		expect(props.panelType).toBe('graph');
 		expect(props.isListViewPanel).toBe(false);
+		// The trace operator combines aggregated trace queries, so it rides along with
+		// the aggregation controls.
+		expect(props.showTraceOperator).toBe(true);
 		expect(props.filterConfigs).toStrictEqual({});
 	});
 
@@ -124,6 +128,7 @@ describe('PanelEditorQueryBuilder field visibility (driven by the capabilities g
 		const props = lastQueryBuilderProps();
 		expect(props.panelType).toBe('list');
 		expect(props.isListViewPanel).toBe(true);
+		expect(props.showTraceOperator).toBe(false);
 		expect(props.filterConfigs).toStrictEqual({
 			stepInterval: { isHidden: true, isDisabled: true },
 			having: { isHidden: true, isDisabled: true },

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PreviewPane/PlotTag.tsx

@@ -1,26 +1,14 @@
 import { Spline } from '@signozhq/icons';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import QueryTypeTag from 'components/QueryTypeTag/QueryTypeTag';
 import { EQueryType } from 'types/common/dashboard';
 
 interface PlotTagProps {
-	/** Authoring mode of the panel's query; undefined when no query exists yet. */
 	queryType: EQueryType | undefined;
-	panelType: PANEL_TYPES;
 	className?: string;
 }
 
-/**
- * "Plotted with <query mode>" chip for the editor preview; V2 counterpart of V1's
- * PlotTag (duplicated per the split policy). Hidden for list panels and before a
- * query exists, where the mode is irrelevant.
- */
-function PlotTag({
-	queryType,
-	panelType,
-	className,
-}: PlotTagProps): JSX.Element | null {
-	if (queryType === undefined || panelType === PANEL_TYPES.LIST) {
+function PlotTag({ queryType, className }: PlotTagProps): JSX.Element | null {
+	if (queryType === undefined) {
 		return null;
 	}
 

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PreviewPane/PreviewPane.tsx

@@ -7,7 +7,6 @@ import PanelBody from 'pages/DashboardPage/DashboardContainer/PanelsAndSectionsL
 import PanelHeader from 'pages/DashboardPage/DashboardContainer/PanelsAndSectionsLayout/Panel/PanelHeader/PanelHeader';
 import type { AnyPanelInteractionProps } from 'pages/DashboardPage/DashboardContainer/Panels/types/interactions';
 import type { RenderablePanelDefinition } from 'pages/DashboardPage/DashboardContainer/Panels/types/panelDefinition';
-import { PANEL_KIND_TO_PANEL_TYPE } from 'pages/DashboardPage/DashboardContainer/Panels/types/panelKind';
 import type { DashboardPreference } from 'pages/DashboardPage/DashboardContainer/Panels/types/rendererProps';
 import { getPanelQueryType } from 'pages/DashboardPage/DashboardContainer/Panels/utils/getPanelQueryType';
 import type {
@@ -72,7 +71,6 @@ function PreviewPane({
 	onClick,
 	enableDrillDown,
 }: PreviewPaneProps): JSX.Element {
-	const panelType = PANEL_KIND_TO_PANEL_TYPE[panel.spec.plugin.kind];
 	const queryType = getPanelQueryType(panel);
 
 	// Search term is ephemeral preview state, threaded to header + renderer but
@@ -84,11 +82,7 @@ function PreviewPane({
 		<div className={styles.preview}>
 			{!hideHeader && (
 				<div className={styles.header}>
-					<PlotTag
-						queryType={queryType}
-						panelType={panelType}
-						className={styles.queryType}
-					/>
+					<PlotTag queryType={queryType} className={styles.queryType} />
 					<div className={styles.dateTimeSelector}>
 						<DateTimeSelectionV2 showAutoRefresh hideShareModal />
 					</div>

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PreviewPane/__tests__/PlotTag.test.tsx

@@ -1,30 +1,17 @@
 import { render, screen } from '@testing-library/react';
-import { PANEL_TYPES } from 'constants/queryBuilder';
 import { EQueryType } from 'types/common/dashboard';
 
 import PlotTag from '../PlotTag';
 
 describe('PlotTag', () => {
 	it('renders the resolved query mode', () => {
-		render(
-			<PlotTag queryType={EQueryType.PROM} panelType={PANEL_TYPES.TIME_SERIES} />,
-		);
+		render(<PlotTag queryType={EQueryType.PROM} />);
 		expect(screen.getByTestId('panel-editor-plot-tag')).toBeInTheDocument();
 		expect(screen.getByText('PromQL')).toBeInTheDocument();
 	});
 
 	it('renders nothing when there is no query yet', () => {
-		render(<PlotTag queryType={undefined} panelType={PANEL_TYPES.TIME_SERIES} />);
-		expect(screen.queryByTestId('panel-editor-plot-tag')).not.toBeInTheDocument();
-	});
-
-	it('renders nothing for list panels (query mode is irrelevant)', () => {
-		render(
-			<PlotTag
-				queryType={EQueryType.QUERY_BUILDER}
-				panelType={PANEL_TYPES.LIST}
-			/>,
-		);
+		render(<PlotTag queryType={undefined} />);
 		expect(screen.queryByTestId('panel-editor-plot-tag')).not.toBeInTheDocument();
 	});
 });

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/hooks/usePanelEditSession.ts

@@ -4,7 +4,10 @@ import type {
 	TelemetrytypesSignalDTO,
 } from 'api/generated/services/sigNoz.schemas';
 import type { PANEL_TYPES } from 'constants/queryBuilder';
-import { getPanelDefinition } from 'pages/DashboardPage/DashboardContainer/Panels/registry';
+import {
+	getPanelDefinition,
+	isPanelKindSupported,
+} from 'pages/DashboardPage/DashboardContainer/Panels/registry';
 import type { RenderablePanelDefinition } from 'pages/DashboardPage/DashboardContainer/Panels/types/panelDefinition';
 import {
 	PANEL_KIND_TO_PANEL_TYPE,
@@ -91,8 +94,9 @@ export function usePanelEditSession({
 	const query = usePanelQuery({
 		panel: draft,
 		panelId,
+		queryCapabilities: panelDefinition.queryCapabilities,
 		time,
-		enabled: !!panelDefinition,
+		enabled: isPanelKindSupported(panelKind),
 	});
 
 	const { runQuery, isQueryDirty, buildSaveSpec } = usePanelEditorQuerySync({

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/hooks/usePanelTypeSwitch.ts

@@ -6,7 +6,7 @@ import type {
 	DashboardtypesQueryDTO,
 	TelemetrytypesSignalDTO,
 } from 'api/generated/services/sigNoz.schemas';
-import { PANEL_TYPES } from 'constants/queryBuilder';
+import type { PANEL_TYPES } from 'constants/queryBuilder';
 import {
 	handleQueryChange,
 	type PartialPanelTypes,
@@ -146,7 +146,7 @@ export function usePanelTypeSwitch({
 			);
 			// Match a fresh list panel's default order so the builder's Order By isn't empty.
 			const nextQuery =
-				newPanelType === PANEL_TYPES.LIST
+				newKind === 'signoz/ListPanel'
 					? withDefaultListOrder(transformed)
 					: transformed;
 			const signal = getBuilderQueries(currentSpec.queries)[0]

frontend/src/pages/DashboardPage/DashboardContainer/Panels/__tests__/capabilities.test.ts

@@ -1,7 +1,14 @@
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { OPERATORS } from 'constants/queryBuilder';
 import { EQueryType } from 'types/common/dashboard';
 
+import { UNSUPPORTED_PANEL } from '../kinds/UnsupportedPanel/definition';
+import { getPanelDefinition, isPanelKindSupported } from '../registry';
+import type { PanelQueryCapabilities } from '../types/panelCapabilities';
+import { NO_PANEL_ACTIONS } from '../types/panelDefinition';
 import {
 	getHiddenQueryBuilderFields,
 	getSupportedQueryTypes,
@@ -15,6 +22,7 @@ import type { PanelKind } from '../types/panelKind';
 
 const { QUERY_BUILDER, CLICKHOUSE, PROM } = EQueryType;
 const { logs, traces, metrics } = TelemetrytypesSignalDTO;
+const { time_series, scalar, raw } = Querybuildertypesv5RequestTypeDTO;
 
 const EXPECTED_QUERY_TYPES: Record<PanelKind, EQueryType[]> = {
 	'signoz/TimeSeriesPanel': [QUERY_BUILDER, CLICKHOUSE, PROM],
@@ -37,9 +45,117 @@ const EXPECTED_SIGNALS: Record<PanelKind, TelemetrytypesSignalDTO[]> = {
 	'signoz/ListPanel': [logs, traces],
 };
 
+// Exhaustive over PanelKind, so a new kind can't ship without stating how its request is
+// shaped — the check that used to be implicit in a legacy PANEL_TYPES switch.
+const EXPECTED_QUERY_CAPABILITIES: Record<PanelKind, PanelQueryCapabilities> = {
+	'signoz/TimeSeriesPanel': {
+		requestType: time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	// Bar bins client-side, so it asks for a widened step interval over a raw series.
+	'signoz/BarChartPanel': {
+		requestType: time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: true,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	'signoz/HistogramPanel': {
+		requestType: time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	'signoz/NumberPanel': {
+		requestType: scalar,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	'signoz/PieChartPanel': {
+		requestType: scalar,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	// Only Table asks the server to transpose its scalar result into UI rows.
+	'signoz/TablePanel': {
+		requestType: scalar,
+		formatTableResultForUI: true,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	// Only List reads raw rows, pages them server-side, and needs an order tiebreaker.
+	'signoz/ListPanel': {
+		requestType: raw,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: true,
+		serverPaginated: true,
+	},
+};
+
 const ALL_KINDS = Object.keys(EXPECTED_QUERY_TYPES) as PanelKind[];
 
 describe('panel capabilities guard', () => {
+	describe('query capabilities', () => {
+		it.each(ALL_KINDS)('declares how %s shapes its request', (kind) => {
+			expect(getPanelDefinition(kind).queryCapabilities).toStrictEqual(
+				EXPECTED_QUERY_CAPABILITIES[kind],
+			);
+		});
+	});
+
+	// A dashboard spec written by a newer SigNoz can name a kind this build has no
+	// definition for. The registry answers with UNSUPPORTED_PANEL rather than nothing, so
+	// every guard below reads it without first proving a definition exists.
+	describe('a kind this build cannot render', () => {
+		const unknownKind = 'signoz/SomeFutureKindPanel' as PanelKind;
+
+		it('is not reported as supported', () => {
+			expect(isPanelKindSupported(unknownKind)).toBe(false);
+			expect(isPanelKindSupported('signoz/TimeSeriesPanel')).toBe(true);
+		});
+
+		it('still resolves to a definition', () => {
+			expect(getPanelDefinition(unknownKind)).toBe(UNSUPPORTED_PANEL);
+		});
+
+		it('declares nothing, so it is never offered as authorable', () => {
+			expect(getSupportedSignals(unknownKind)).toStrictEqual([]);
+			expect(getSupportedQueryTypes(unknownKind)).toStrictEqual([]);
+			expect(isSignalSupported(unknownKind, logs)).toBe(false);
+			expect(
+				isPanelCombinationValid({ kind: unknownKind, queryType: QUERY_BUILDER }),
+			).toBe(false);
+			expect(getHiddenQueryBuilderFields(unknownKind, logs)).toStrictEqual({});
+			expect(getPanelDefinition(unknownKind).sections).toStrictEqual([]);
+		});
+
+		it('offers no actions', () => {
+			expect(getPanelDefinition(unknownKind).actions).toStrictEqual(
+				NO_PANEL_ACTIONS,
+			);
+			expect(NO_PANEL_ACTIONS.view).toBe(false);
+			expect(NO_PANEL_ACTIONS.edit).toBe(false);
+			expect(NO_PANEL_ACTIONS.drilldown).toBe(false);
+		});
+
+		it('carries an inert query shape, so a stray request can do no harm', () => {
+			const { queryCapabilities } = getPanelDefinition(unknownKind);
+			expect(queryCapabilities.requestType).toBe(time_series);
+			expect(queryCapabilities.serverPaginated).toBe(false);
+			expect(queryCapabilities.formatTableResultForUI).toBe(false);
+		});
+	});
+
 	describe('query type support', () => {
 		it.each(ALL_KINDS)('declares the expected query types for %s', (kind) => {
 			expect(getSupportedQueryTypes(kind)).toStrictEqual(

frontend/src/pages/DashboardPage/DashboardContainer/Panels/components/NoData/NoData.tsx

@@ -20,8 +20,12 @@ interface NoDataProps {
 	isFetching?: boolean;
 	/** When provided, renders a Retry button that re-runs the query. */
 	onRetry?: () => void;
-	/** Hides the global "Extend time range" action when this panel is locked to a fixed time preference. */
-	panel?: DashboardtypesPanelDTO;
+	/**
+	 * The panel this empty state stands in for. Every renderer has it, and it decides
+	 * whether the global "Extend time range" action applies (a panel locked to a fixed
+	 * time preference can't be widened by it) as well as what the action events report.
+	 */
+	panel: DashboardtypesPanelDTO;
 	'data-testid'?: string;
 }
 
@@ -43,19 +47,17 @@ function NoData({
 	const globalExtend = useExtendTimeWindow();
 	// The View modal's local extender wins; the global one only applies to a panel that
 	// follows the ambient window (a fixed preference can't be widened by it).
-	const hasFixedTimePreference = panel
-		? panelHasFixedTimePreference(panel)
-		: false;
 	const activeExtend =
-		viewExtend ?? (hasFixedTimePreference ? undefined : globalExtend);
+		viewExtend ?? (panelHasFixedTimePreference(panel) ? undefined : globalExtend);
 
 	if (isFetching) {
 		return <PanelLoader />;
 	}
 
-	const panelType = panel
-		? PANEL_KIND_TO_PANEL_TYPE[panel.spec.plugin.kind]
-		: undefined;
+	// `panelType` stays on the event so existing reports keep resolving; `panelKind` is the
+	// V2 identity, and the only one that can tell two kinds sharing a panel type apart.
+	const panelKind = panel.spec.plugin.kind;
+	const panelType = PANEL_KIND_TO_PANEL_TYPE[panelKind];
 
 	const extendAction: PanelMessageAction | undefined =
 		activeExtend?.canExtend && activeExtend.actionLabel
@@ -65,6 +67,7 @@ function NoData({
 						void logEvent(DashboardDetailEvents.NoDataAction, {
 							action: 'extendTime',
 							panelType,
+							panelKind,
 						});
 						activeExtend.extend();
 					},
@@ -79,6 +82,7 @@ function NoData({
 					void logEvent(DashboardDetailEvents.NoDataAction, {
 						action: 'retry',
 						panelType,
+						panelKind,
 					});
 					onRetry();
 				},

frontend/src/pages/DashboardPage/DashboardContainer/Panels/components/NoData/__tests__/NoData.test.tsx

@@ -33,7 +33,12 @@ function panelWith(
 	timePreference?: DashboardtypesTimePreferenceDTO,
 ): DashboardtypesPanelDTO {
 	return {
-		spec: { plugin: { spec: { visualization: { timePreference } } } },
+		spec: {
+			plugin: {
+				kind: 'signoz/TimeSeriesPanel',
+				spec: { visualization: { timePreference } },
+			},
+		},
 	} as unknown as DashboardtypesPanelDTO;
 }
 
@@ -44,7 +49,7 @@ describe('NoData', () => {
 	});
 
 	it('renders the empty-state title and hint', () => {
-		render(<NoData />);
+		render(<NoData panel={panelWith()} />);
 
 		expect(screen.getByTestId('panel-no-data')).toBeInTheDocument();
 		expect(screen.getByText('No data in this time range')).toBeInTheDocument();
@@ -55,7 +60,7 @@ describe('NoData', () => {
 
 	it('offers to extend the window as the primary action', () => {
 		mockUseExtendTimeWindow.mockReturnValue(extender());
-		render(<NoData />);
+		render(<NoData panel={panelWith()} />);
 
 		const action = screen.getByTestId('panel-no-data-action');
 		expect(action).toHaveTextContent('Extend time range');
@@ -68,7 +73,7 @@ describe('NoData', () => {
 	it('renders both Extend (primary) and Retry (secondary) when a retry handler is given', () => {
 		const onRetry = jest.fn();
 		mockUseExtendTimeWindow.mockReturnValue(extender());
-		render(<NoData onRetry={onRetry} />);
+		render(<NoData onRetry={onRetry} panel={panelWith()} />);
 
 		expect(screen.getByTestId('panel-no-data-action')).toHaveTextContent(
 			'Extend time range',
@@ -82,7 +87,7 @@ describe('NoData', () => {
 
 	it('falls back to Retry as the sole action when the window cannot be widened', () => {
 		const onRetry = jest.fn();
-		render(<NoData onRetry={onRetry} />);
+		render(<NoData onRetry={onRetry} panel={panelWith()} />);
 
 		const action = screen.getByTestId('panel-no-data-action');
 		expect(action).toHaveTextContent('Retry');
@@ -101,7 +106,7 @@ describe('NoData', () => {
 		useViewPanelStore.setState({
 			viewPanelExtendWindow: extender({ extend: storeExtend }),
 		});
-		render(<NoData />);
+		render(<NoData panel={panelWith()} />);
 
 		fireEvent.click(screen.getByTestId('panel-no-data-action'));
 		expect(storeExtend).toHaveBeenCalledTimes(1);
@@ -109,7 +114,7 @@ describe('NoData', () => {
 	});
 
 	it('renders no action when nothing can be widened and no retry handler', () => {
-		render(<NoData />);
+		render(<NoData panel={panelWith()} />);
 
 		expect(screen.queryByTestId('panel-no-data-action')).not.toBeInTheDocument();
 		expect(
@@ -119,7 +124,7 @@ describe('NoData', () => {
 
 	it('shows the panel loader (not the empty state) while refetching', () => {
 		mockUseExtendTimeWindow.mockReturnValue(extender());
-		render(<NoData isFetching />);
+		render(<NoData isFetching panel={panelWith()} />);
 
 		expect(screen.getByTestId('panel-loading')).toBeInTheDocument();
 		expect(screen.queryByTestId('panel-no-data')).not.toBeInTheDocument();
@@ -128,7 +133,7 @@ describe('NoData', () => {
 
 	it('honours the data-testid override for the number panel', () => {
 		mockUseExtendTimeWindow.mockReturnValue(extender());
-		render(<NoData data-testid="number-panel-no-data" />);
+		render(<NoData data-testid="number-panel-no-data" panel={panelWith()} />);
 
 		expect(screen.getByTestId('number-panel-no-data')).toBeInTheDocument();
 	});

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/BarChartPanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { EQueryType } from 'types/common/dashboard';
 
 export const definition: PanelDefinition<'signoz/BarChartPanel'> = {
@@ -20,6 +23,15 @@ export const definition: PanelDefinition<'signoz/BarChartPanel'> = {
 		EQueryType.PROM,
 	],
 	queryBuilderFields: {},
+	// Bars are binned client-side from a raw time series, so the request asks for a
+	// step interval wide enough to keep the bar count readable (V1 parity).
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: true,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
 	actions: {
 		view: true,
 		edit: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/BarChartPanel/utils/buildConfig.ts

@@ -1,33 +1,22 @@
 import type { DashboardtypesBarChartPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
-import { Timezone } from 'components/CustomTimePicker/timezoneUtils';
-import { PANEL_TYPES } from 'constants/queryBuilder';
-import { PanelMode } from 'lib/visualization/panels/types';
-import { buildBaseConfig } from 'pages/DashboardPage/DashboardContainer/Panels/utils/baseConfigBuilder';
+import {
+	buildBaseConfig,
+	type TimeAxisChromeArgs,
+} from 'pages/DashboardPage/DashboardContainer/Panels/utils/baseConfigBuilder';
 import { resolveSeriesLabelV5 } from 'pages/DashboardPage/DashboardContainer/Panels/utils/resolveSeriesLabel';
 import type { PanelSeries } from 'pages/DashboardPage/DashboardContainer/queryV5/types';
 import { toClickPluginPayload } from 'pages/DashboardPage/DashboardContainer/queryV5/uplotData';
 import getLabelName from 'lib/getLabelName';
-import { OnClickPluginOpts } from 'lib/uPlotLib/plugins/onClickPlugin';
 import { DrawStyle } from 'lib/uPlotV2/config/types';
 import { UPlotConfigBuilder } from 'lib/uPlotV2/config/UPlotConfigBuilder';
 import type { BuilderQuery } from 'types/api/v5/queryRange';
 
-export interface BuildBarChartConfigArgs {
-	panelId: string;
+export interface BuildBarChartConfigArgs extends TimeAxisChromeArgs {
 	spec: DashboardtypesBarChartPanelSpecDTO;
 	/** Flat list of builder queries (see `getBuilderQueries`); powers per-query legend resolution. */
 	builderQueries: BuilderQuery[];
 	/** Flattened V5 series (see `flattenTimeSeries`). */
 	series: PanelSeries[];
-	/** Per-query step intervals from the response exec stats. */
-	stepIntervals?: Record<string, number>;
-	isDarkMode: boolean;
-	timezone: Timezone;
-	panelMode: PanelMode;
-	onDragSelect?: (start: number, end: number) => void;
-	onClick?: OnClickPluginOpts['onClick'];
-	minTimeScale?: number;
-	maxTimeScale?: number;
 }
 
 /** Builds a `UPlotConfigBuilder` for a Bar chart panel: shared scaffolding, optional stacking, one bar series per result. */
@@ -47,7 +36,7 @@ export function buildBarChartConfig({
 }: BuildBarChartConfigArgs): UPlotConfigBuilder {
 	const builder = buildBaseConfig({
 		panelId,
-		panelType: PANEL_TYPES.BAR,
+		isTimeAxis: true,
 		isDarkMode,
 		timezone,
 		panelMode,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/HistogramPanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { EQueryType } from 'types/common/dashboard';
 
 export const definition: PanelDefinition<'signoz/HistogramPanel'> = {
@@ -20,6 +23,15 @@ export const definition: PanelDefinition<'signoz/HistogramPanel'> = {
 		EQueryType.PROM,
 	],
 	queryBuilderFields: {},
+	// Buckets are computed client-side from the raw series, so the request is a plain
+	// time series — the bucket count is a display concern, not a query one.
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
 	actions: {
 		view: true,
 		edit: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/HistogramPanel/utils/buildConfig.ts

@@ -1,8 +1,8 @@
 import type { DashboardtypesHistogramPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
-import { Timezone } from 'components/CustomTimePicker/timezoneUtils';
-import { PANEL_TYPES } from 'constants/queryBuilder';
-import { PanelMode } from 'lib/visualization/panels/types';
-import { buildBaseConfig } from 'pages/DashboardPage/DashboardContainer/Panels/utils/baseConfigBuilder';
+import {
+	buildBaseConfig,
+	type PanelChromeArgs,
+} from 'pages/DashboardPage/DashboardContainer/Panels/utils/baseConfigBuilder';
 import { resolveSeriesLabelV5 } from 'pages/DashboardPage/DashboardContainer/Panels/utils/resolveSeriesLabel';
 import type { PanelSeries } from 'pages/DashboardPage/DashboardContainer/queryV5/types';
 import getLabelName from 'lib/getLabelName';
@@ -16,16 +16,12 @@ const BAR_WIDTH_FACTOR = 1;
 const MERGED_SERIES_LINE_COLOR = '#3f5ecc';
 const MERGED_SERIES_FILL_COLOR = '#4E74F8';
 
-export interface BuildHistogramConfigArgs {
-	panelId: string;
+export interface BuildHistogramConfigArgs extends PanelChromeArgs {
 	spec: DashboardtypesHistogramPanelSpecDTO;
 	/** Builder queries on this panel — used to resolve per-series labels. */
 	builderQueries: BuilderQuery[];
 	/** Flattened V5 series (see `flattenTimeSeries`). */
 	series: PanelSeries[];
-	isDarkMode: boolean;
-	timezone: Timezone;
-	panelMode: PanelMode;
 }
 
 /**
@@ -44,7 +40,7 @@ export function buildHistogramConfig({
 }: BuildHistogramConfigArgs): UPlotConfigBuilder {
 	const builder = buildBaseConfig({
 		panelId,
-		panelType: PANEL_TYPES.HISTOGRAM,
+		isTimeAxis: false,
 		isDarkMode,
 		timezone,
 		panelMode,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/ListPanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { OPERATORS } from 'constants/queryBuilder';
 import { EQueryType } from 'types/common/dashboard';
 
@@ -30,6 +33,15 @@ export const definition: PanelDefinition<'signoz/ListPanel'> = {
 		},
 	},
 	sections,
+	// The only kind reading raw rows: they page server-side, and the sort needs a
+	// tiebreaker so a duplicated sort key can't repeat or skip a row across pages.
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.raw,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: true,
+		serverPaginated: true,
+	},
 	actions: {
 		view: true,
 		edit: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/NumberPanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { EQueryType } from 'types/common/dashboard';
 
 export const definition: PanelDefinition<'signoz/NumberPanel'> = {
@@ -20,6 +23,13 @@ export const definition: PanelDefinition<'signoz/NumberPanel'> = {
 		EQueryType.PROM,
 	],
 	queryBuilderFields: {},
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.scalar,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
 	actions: {
 		view: true,
 		edit: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/PieChartPanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { EQueryType } from 'types/common/dashboard';
 
 export const definition: PanelDefinition<'signoz/PieChartPanel'> = {
@@ -16,6 +19,13 @@ export const definition: PanelDefinition<'signoz/PieChartPanel'> = {
 	],
 	supportedQueryTypes: [EQueryType.QUERY_BUILDER, EQueryType.CLICKHOUSE],
 	queryBuilderFields: {},
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.scalar,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
 	actions: {
 		view: true,
 		edit: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/TablePanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { EQueryType } from 'types/common/dashboard';
 
 export const definition: PanelDefinition<'signoz/TablePanel'> = {
@@ -16,6 +19,14 @@ export const definition: PanelDefinition<'signoz/TablePanel'> = {
 	],
 	supportedQueryTypes: [EQueryType.QUERY_BUILDER, EQueryType.CLICKHOUSE],
 	queryBuilderFields: {},
+	// The only kind that asks the server to transpose its scalar result into UI rows.
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.scalar,
+		formatTableResultForUI: true,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
 	// Tables carry tabular data worth exporting (V1 parity: download is table-only).
 	actions: {
 		view: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/TimeSeriesPanel/definition.ts

@@ -1,7 +1,10 @@
 import type { PanelDefinition } from '../../types/panelDefinition';
 import Renderer from './Renderer';
 import { sections } from './sections';
-import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	Querybuildertypesv5RequestTypeDTO,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
 import { EQueryType } from 'types/common/dashboard';
 
 export const definition: PanelDefinition<'signoz/TimeSeriesPanel'> = {
@@ -20,6 +23,13 @@ export const definition: PanelDefinition<'signoz/TimeSeriesPanel'> = {
 		EQueryType.PROM,
 	],
 	queryBuilderFields: {},
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
 	actions: {
 		view: true,
 		edit: true,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/TimeSeriesPanel/utils/buildConfig.ts

@@ -1,10 +1,8 @@
 import type { DashboardtypesTimeSeriesPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
-import { Timezone } from 'components/CustomTimePicker/timezoneUtils';
-import { PANEL_TYPES } from 'constants/queryBuilder';
-import { PanelMode } from 'lib/visualization/panels/types';
 import {
 	buildBaseConfig,
 	minStepInterval,
+	type TimeAxisChromeArgs,
 } from 'pages/DashboardPage/DashboardContainer/Panels/utils/baseConfigBuilder';
 import {
 	FILL_MODE_MAP,
@@ -19,7 +17,6 @@ import {
 	toClickPluginPayload,
 } from 'pages/DashboardPage/DashboardContainer/queryV5/uplotData';
 import getLabelName from 'lib/getLabelName';
-import { OnClickPluginOpts } from 'lib/uPlotLib/plugins/onClickPlugin';
 import {
 	DrawStyle,
 	FillMode,
@@ -31,22 +28,12 @@ import type { BuilderQuery } from 'types/api/v5/queryRange';
 
 const DEFAULT_POINT_SIZE = 5;
 
-export interface BuildTimeSeriesConfigArgs {
-	panelId: string;
+export interface BuildTimeSeriesConfigArgs extends TimeAxisChromeArgs {
 	spec: DashboardtypesTimeSeriesPanelSpecDTO;
 	/** Flat list of builder queries (see `getBuilderQueries`); powers per-query legend resolution. */
 	builderQueries: BuilderQuery[];
 	/** Flattened V5 series (see `flattenTimeSeries`). */
 	series: PanelSeries[];
-	/** Per-query step intervals from the response exec stats. */
-	stepIntervals?: Record<string, number>;
-	isDarkMode: boolean;
-	timezone: Timezone;
-	panelMode: PanelMode;
-	onDragSelect?: (start: number, end: number) => void;
-	onClick?: OnClickPluginOpts['onClick'];
-	minTimeScale?: number;
-	maxTimeScale?: number;
 }
 
 /** Builds a `UPlotConfigBuilder` for a TimeSeries panel: shared scaffolding plus one series per result. */
@@ -66,7 +53,7 @@ export function buildTimeSeriesConfig({
 }: BuildTimeSeriesConfigArgs): UPlotConfigBuilder {
 	const builder = buildBaseConfig({
 		panelId,
-		panelType: PANEL_TYPES.TIME_SERIES,
+		isTimeAxis: true,
 		isDarkMode,
 		timezone,
 		panelMode,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/UnsupportedPanel/Renderer.tsx

@@ -0,0 +1,26 @@
+import { CircleHelp } from '@signozhq/icons';
+
+import PanelMessage from '../../components/PanelMessage/PanelMessage';
+import PanelStyles from '../../panel.module.scss';
+
+/**
+ * Body for a panel whose kind this build has no renderer for — a spec written by a newer
+ * SigNoz names a visualization that didn't exist when this client shipped. Says so in
+ * place of the chart, so the panel keeps its slot in the layout instead of leaving a hole.
+ */
+function UnsupportedPanelRenderer(): JSX.Element {
+	return (
+		<div
+			data-testid="unsupported-panel-renderer"
+			className={PanelStyles.panelContainer}
+		>
+			<PanelMessage
+				icon={<CircleHelp size={18} />}
+				title="Unsupported panel type"
+				description="This panel was built with a newer version of SigNoz. Upgrade to view it."
+			/>
+		</div>
+	);
+}
+
+export default UnsupportedPanelRenderer;

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/UnsupportedPanel/definition.ts

@@ -0,0 +1,34 @@
+import { Querybuildertypesv5RequestTypeDTO } from 'api/generated/services/sigNoz.schemas';
+
+import {
+	NO_PANEL_ACTIONS,
+	type RenderablePanelDefinition,
+} from '../../types/panelDefinition';
+import Renderer from './Renderer';
+
+/**
+ * Stand-in definition for a kind that isn't in the registry, so `getPanelDefinition`
+ * always resolves and no caller has to branch on a missing one. It declares nothing: no
+ * signals, no query types, no config sections and no actions — an unknown kind can't be
+ * queried, configured or acted on, only shown as unsupported.
+ *
+ * `kind` carries a sentinel that no API enum value can collide with; the cast is the one
+ * place this definition steps outside `PanelKind`.
+ */
+export const UNSUPPORTED_PANEL: RenderablePanelDefinition = {
+	kind: '<unsupported>' as RenderablePanelDefinition['kind'],
+	displayName: 'Unsupported panel',
+	Renderer,
+	sections: [],
+	supportedSignals: [],
+	supportedQueryTypes: [],
+	queryBuilderFields: {},
+	queryCapabilities: {
+		requestType: Querybuildertypesv5RequestTypeDTO.time_series,
+		formatTableResultForUI: false,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+	},
+	actions: NO_PANEL_ACTIONS,
+};

frontend/src/pages/DashboardPage/DashboardContainer/Panels/registry.ts

@@ -5,6 +5,7 @@ import { definition as PieChart } from './kinds/PieChartPanel/definition';
 import { definition as TimeSeries } from './kinds/TimeSeriesPanel/definition';
 import { definition as Table } from './kinds/TablePanel/definition';
 import { definition as List } from './kinds/ListPanel/definition';
+import { UNSUPPORTED_PANEL } from './kinds/UnsupportedPanel/definition';
 import type {
 	PanelRegistry,
 	RenderablePanelDefinition,
@@ -22,8 +23,24 @@ export const PANELS: PanelRegistry = {
 	[List.kind]: List,
 };
 
+/**
+ * Whether this build can render the kind. `PanelKind` spans every kind the API declares,
+ * but a dashboard spec written by a newer SigNoz can name one this client has never heard
+ * of — so ask before doing work on a panel's behalf, such as fetching its data.
+ */
+export function isPanelKindSupported(kind: PanelKind): boolean {
+	return kind in PANELS;
+}
+
+/**
+ * The definition for a kind — always one. An unregistered kind resolves to
+ * {@link UNSUPPORTED_PANEL}, which declares no capabilities and renders as unsupported, so
+ * callers read a definition's fields without first proving it exists.
+ */
 export function getPanelDefinition(kind: PanelKind): RenderablePanelDefinition {
 	// Single intentional cast widening the per-kind Renderer to the kind-agnostic
 	// prop surface (a per-kind renderer can't be statically validated against the union).
-	return PANELS[kind] as RenderablePanelDefinition;
+	return (
+		(PANELS[kind] as RenderablePanelDefinition | undefined) ?? UNSUPPORTED_PANEL
+	);
 }