fix(dashboards): restore a percentile when a histogram leaves a heatmap

Switching into a heatmap swaps a histogram's percentile for sum, and picking
the metric there defaults to sum. Nothing undid it on the way out, so a panel
switched to time series sat on a value its own selector does not offer.

Mirror the transform: on a first visit to any other kind, a histogram holding
sum goes back to p90. Other metric types keep theirs, since sum is a real
choice for a sum or a gauge.

Assisted-by: Claude Opus 5

docs/api/openapi.yml

@@ -3474,6 +3474,79 @@ components:
       - tags
       - spec
       type: object
+    DashboardtypesHeatmapAxes:
+      properties:
+        yScale:
+          $ref: '#/components/schemas/DashboardtypesHeatmapYScale'
+      type: object
+    DashboardtypesHeatmapChartAppearance:
+      properties:
+        colors:
+          $ref: '#/components/schemas/DashboardtypesHeatmapColors'
+      type: object
+    DashboardtypesHeatmapColorMode:
+      enum:
+      - palette
+      - opacity
+      type: string
+    DashboardtypesHeatmapColorScale:
+      enum:
+      - log
+      - sqrt
+      - linear
+      type: string
+    DashboardtypesHeatmapColors:
+      properties:
+        fill:
+          type: string
+        maxCount:
+          nullable: true
+          type: number
+        minCount:
+          nullable: true
+          type: number
+        mode:
+          $ref: '#/components/schemas/DashboardtypesHeatmapColorMode'
+        palette:
+          $ref: '#/components/schemas/DashboardtypesHeatmapPalette'
+        scale:
+          $ref: '#/components/schemas/DashboardtypesHeatmapColorScale'
+        steps:
+          type: integer
+      type: object
+    DashboardtypesHeatmapPalette:
+      enum:
+      - ice
+      - moss
+      - rust
+      - graphite
+      - ember
+      - lagoon
+      - orchid
+      - verdant
+      - lava
+      - beacon
+      type: string
+    DashboardtypesHeatmapPanelSpec:
+      properties:
+        axes:
+          $ref: '#/components/schemas/DashboardtypesHeatmapAxes'
+        chartAppearance:
+          $ref: '#/components/schemas/DashboardtypesHeatmapChartAppearance'
+        formatting:
+          $ref: '#/components/schemas/DashboardtypesPanelFormatting'
+        legend:
+          $ref: '#/components/schemas/DashboardtypesLegend'
+        visualization:
+          $ref: '#/components/schemas/DashboardtypesBasicVisualization'
+      type: object
+    DashboardtypesHeatmapYScale:
+      enum:
+      - auto
+      - linear
+      - log
+      - symlog
+      type: string
     DashboardtypesHistogramBuckets:
       properties:
         bucketCount:
@@ -3826,6 +3899,7 @@ components:
       discriminator:
         mapping:
           signoz/BarChartPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesBarChartPanelSpec'
+          signoz/HeatmapPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpec'
           signoz/HistogramPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHistogramPanelSpec'
           signoz/ListPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpec'
           signoz/NumberPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesNumberPanelSpec'
@@ -3841,6 +3915,7 @@ components:
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTablePanelSpec'
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHistogramPanelSpec'
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpec'
+      - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpec'
       type: object
     DashboardtypesPanelPluginKind:
       enum:
@@ -3851,6 +3926,7 @@ components:
       - signoz/TablePanel
       - signoz/HistogramPanel
       - signoz/ListPanel
+      - signoz/HeatmapPanel
       type: string
     DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesBarChartPanelSpec:
       properties:
@@ -3864,6 +3940,18 @@ components:
       - kind
       - spec
       type: object
+    DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpec:
+      properties:
+        kind:
+          enum:
+          - signoz/HeatmapPanel
+          type: string
+        spec:
+          $ref: '#/components/schemas/DashboardtypesHeatmapPanelSpec'
+      required:
+      - kind
+      - spec
+      type: object
     DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHistogramPanelSpec:
       properties:
         kind:
@@ -7395,10 +7483,7 @@ components:
             $ref: '#/components/schemas/Querybuildertypesv5TimeSeries'
           type: array
         meta:
-          properties:
-            unit:
-              type: string
-          type: object
+          $ref: '#/components/schemas/Querybuildertypesv5AggregationMeta'
         predictedSeries:
           items:
             $ref: '#/components/schemas/Querybuildertypesv5TimeSeries'
@@ -7413,12 +7498,51 @@ components:
             $ref: '#/components/schemas/Querybuildertypesv5TimeSeries'
           type: array
       type: object
-    Querybuildertypesv5Bucket:
+    Querybuildertypesv5AggregationMeta:
       properties:
-        step:
-          format: double
-          type: number
+        buckets:
+          items:
+            format: double
+            type: number
+          type: array
+        unit:
+          type: string
       type: object
+    Querybuildertypesv5BucketOptions:
+      discriminator:
+        mapping:
+          linear: '#/components/schemas/Querybuildertypesv5BucketOptionsLinear'
+          log: '#/components/schemas/Querybuildertypesv5BucketOptionsLog'
+        propertyName: kind
+      oneOf:
+      - $ref: '#/components/schemas/Querybuildertypesv5BucketOptionsLinear'
+      - $ref: '#/components/schemas/Querybuildertypesv5BucketOptionsLog'
+      type: object
+    Querybuildertypesv5BucketOptionsLinear:
+      properties:
+        kind:
+          $ref: '#/components/schemas/Querybuildertypesv5BucketsKind'
+        spec:
+          $ref: '#/components/schemas/Querybuildertypesv5LinearBucketsSpec'
+      required:
+      - kind
+      - spec
+      type: object
+    Querybuildertypesv5BucketOptionsLog:
+      properties:
+        kind:
+          $ref: '#/components/schemas/Querybuildertypesv5BucketsKind'
+        spec:
+          $ref: '#/components/schemas/Querybuildertypesv5LogBucketsSpec'
+      required:
+      - kind
+      - spec
+      type: object
+    Querybuildertypesv5BucketsKind:
+      enum:
+      - linear
+      - log
+      type: string
     Querybuildertypesv5BuilderQuerySpec:
       discriminator:
         mapping:
@@ -7599,6 +7723,16 @@ components:
         value:
           type: string
       type: object
+    Querybuildertypesv5LinearBucketsSpec:
+      properties:
+        maxValue:
+          format: double
+          type: number
+        numBuckets:
+          type: integer
+      required:
+      - maxValue
+      type: object
     Querybuildertypesv5LogAggregation:
       properties:
         alias:
@@ -7606,6 +7740,12 @@ components:
         expression:
           type: string
       type: object
+    Querybuildertypesv5LogBucketsSpec:
+      properties:
+        scale:
+          nullable: true
+          type: integer
+      type: object
     Querybuildertypesv5MetricAggregation:
       properties:
         comparisonSpaceAggregationParam:
@@ -8064,6 +8204,8 @@ components:
         queries (traces, logs, metrics), formulas, joins, trace operators, PromQL,
         and ClickHouse SQL queries.
       properties:
+        bucketOptions:
+          $ref: '#/components/schemas/Querybuildertypesv5BucketOptions'
         compositeQuery:
           $ref: '#/components/schemas/Querybuildertypesv5CompositeQuery'
         end:
@@ -8163,6 +8305,7 @@ components:
       - raw
       - raw_stream
       - trace
+      - heatmap
       type: string
     Querybuildertypesv5ScalarData:
       properties:
@@ -8237,8 +8380,6 @@ components:
       type: object
     Querybuildertypesv5TimeSeriesValue:
       properties:
-        bucket:
-          $ref: '#/components/schemas/Querybuildertypesv5Bucket'
         partial:
           type: boolean
         timestamp:

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

@@ -4914,6 +4914,83 @@ export interface DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDa
 	spec: DashboardtypesListPanelSpecDTO;
 }
 
+export enum DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpecDTOKind {
+	'signoz/HeatmapPanel' = 'signoz/HeatmapPanel',
+}
+export enum DashboardtypesHeatmapYScaleDTO {
+	auto = 'auto',
+	linear = 'linear',
+	log = 'log',
+	symlog = 'symlog',
+}
+export interface DashboardtypesHeatmapAxesDTO {
+	yScale?: DashboardtypesHeatmapYScaleDTO;
+}
+
+export enum DashboardtypesHeatmapColorModeDTO {
+	palette = 'palette',
+	opacity = 'opacity',
+}
+export enum DashboardtypesHeatmapPaletteDTO {
+	ice = 'ice',
+	moss = 'moss',
+	rust = 'rust',
+	graphite = 'graphite',
+	ember = 'ember',
+	lagoon = 'lagoon',
+	orchid = 'orchid',
+	verdant = 'verdant',
+	lava = 'lava',
+	beacon = 'beacon',
+}
+export enum DashboardtypesHeatmapColorScaleDTO {
+	log = 'log',
+	sqrt = 'sqrt',
+	linear = 'linear',
+}
+export interface DashboardtypesHeatmapColorsDTO {
+	/**
+	 * @type string
+	 */
+	fill?: string;
+	/**
+	 * @type number,null
+	 */
+	maxCount?: number | null;
+	/**
+	 * @type number,null
+	 */
+	minCount?: number | null;
+	mode?: DashboardtypesHeatmapColorModeDTO;
+	palette?: DashboardtypesHeatmapPaletteDTO;
+	scale?: DashboardtypesHeatmapColorScaleDTO;
+	/**
+	 * @type integer
+	 */
+	steps?: number;
+}
+
+export interface DashboardtypesHeatmapChartAppearanceDTO {
+	colors?: DashboardtypesHeatmapColorsDTO;
+}
+
+export interface DashboardtypesHeatmapPanelSpecDTO {
+	axes?: DashboardtypesHeatmapAxesDTO;
+	chartAppearance?: DashboardtypesHeatmapChartAppearanceDTO;
+	formatting?: DashboardtypesPanelFormattingDTO;
+	legend?: DashboardtypesLegendDTO;
+	visualization?: DashboardtypesBasicVisualizationDTO;
+}
+
+export interface DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpecDTO {
+	/**
+	 * @enum signoz/HeatmapPanel
+	 * @type string
+	 */
+	kind: DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpecDTOKind;
+	spec: DashboardtypesHeatmapPanelSpecDTO;
+}
+
 export type DashboardtypesPanelPluginDTO =
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTimeSeriesPanelSpecDTO
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesBarChartPanelSpecDTO
@@ -4921,7 +4998,8 @@ export type DashboardtypesPanelPluginDTO =
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesPieChartPanelSpecDTO
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTablePanelSpecDTO
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHistogramPanelSpecDTO
-	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpecDTO;
+	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpecDTO
+	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpecDTO;
 
 export enum Querybuildertypesv5RequestTypeDTO {
 	scalar = 'scalar',
@@ -4929,6 +5007,7 @@ export enum Querybuildertypesv5RequestTypeDTO {
 	raw = 'raw',
 	raw_stream = 'raw_stream',
 	trace = 'trace',
+	heatmap = 'heatmap',
 }
 export enum DashboardtypesQueryPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesBuilderQuerySpecDTOKind {
 	'signoz/BuilderQuery' = 'signoz/BuilderQuery',
@@ -5843,6 +5922,7 @@ export enum DashboardtypesPanelPluginKindDTO {
 	'signoz/TablePanel' = 'signoz/TablePanel',
 	'signoz/HistogramPanel' = 'signoz/HistogramPanel',
 	'signoz/ListPanel' = 'signoz/ListPanel',
+	'signoz/HeatmapPanel' = 'signoz/HeatmapPanel',
 }
 /**
  * @nullable
@@ -8542,16 +8622,7 @@ export interface Querybuildertypesv5LabelDTO {
 	value?: Querybuildertypesv5LabelDTOValue;
 }
 
-export interface Querybuildertypesv5BucketDTO {
-	/**
-	 * @type number
-	 * @format double
-	 */
-	step?: number;
-}
-
 export interface Querybuildertypesv5TimeSeriesValueDTO {
-	bucket?: Querybuildertypesv5BucketDTO;
 	/**
 	 * @type boolean
 	 */
@@ -9102,12 +9173,16 @@ export interface PromotetypesPromotePathDTO {
 	promote?: boolean;
 }
 
-export type Querybuildertypesv5AggregationBucketDTOMeta = {
+export interface Querybuildertypesv5AggregationMetaDTO {
+	/**
+	 * @type array
+	 */
+	buckets?: number[];
 	/**
 	 * @type string
 	 */
 	unit?: string;
-};
+}
 
 export interface Querybuildertypesv5AggregationBucketDTO {
 	/**
@@ -9126,10 +9201,7 @@ export interface Querybuildertypesv5AggregationBucketDTO {
 	 * @type array
 	 */
 	lowerBoundSeries?: Querybuildertypesv5TimeSeriesDTO[];
-	/**
-	 * @type object
-	 */
-	meta?: Querybuildertypesv5AggregationBucketDTOMeta;
+	meta?: Querybuildertypesv5AggregationMetaDTO;
 	/**
 	 * @type array
 	 */
@@ -9144,6 +9216,57 @@ export interface Querybuildertypesv5AggregationBucketDTO {
 	upperBoundSeries?: Querybuildertypesv5TimeSeriesDTO[];
 }
 
+export enum Querybuildertypesv5BucketOptionsLinearDTOKind {
+	linear = 'linear',
+}
+export interface Querybuildertypesv5LinearBucketsSpecDTO {
+	/**
+	 * @type number
+	 * @format double
+	 */
+	maxValue: number;
+	/**
+	 * @type integer
+	 */
+	numBuckets?: number;
+}
+
+export interface Querybuildertypesv5BucketOptionsLinearDTO {
+	/**
+	 * @type string
+	 * @enum linear
+	 */
+	kind: Querybuildertypesv5BucketOptionsLinearDTOKind;
+	spec: Querybuildertypesv5LinearBucketsSpecDTO;
+}
+
+export enum Querybuildertypesv5BucketOptionsLogDTOKind {
+	log = 'log',
+}
+export interface Querybuildertypesv5LogBucketsSpecDTO {
+	/**
+	 * @type integer,null
+	 */
+	scale?: number | null;
+}
+
+export interface Querybuildertypesv5BucketOptionsLogDTO {
+	/**
+	 * @type string
+	 * @enum log
+	 */
+	kind: Querybuildertypesv5BucketOptionsLogDTOKind;
+	spec: Querybuildertypesv5LogBucketsSpecDTO;
+}
+
+export type Querybuildertypesv5BucketOptionsDTO =
+	| Querybuildertypesv5BucketOptionsLinearDTO
+	| Querybuildertypesv5BucketOptionsLogDTO;
+
+export enum Querybuildertypesv5BucketsKindDTO {
+	linear = 'linear',
+	log = 'log',
+}
 export type Querybuildertypesv5ColumnDescriptorDTOMeta = {
 	/**
 	 * @type string
@@ -9493,6 +9616,7 @@ export type Querybuildertypesv5QueryRangeRequestDTOVariables = {
  * Request body for the v5 query range endpoint. Supports builder queries (traces, logs, metrics), formulas, joins, trace operators, PromQL, and ClickHouse SQL queries.
  */
 export interface Querybuildertypesv5QueryRangeRequestDTO {
+	bucketOptions?: Querybuildertypesv5BucketOptionsDTO;
 	compositeQuery?: Querybuildertypesv5CompositeQueryDTO;
 	/**
 	 * @type integer

frontend/src/components/InputWithLabel/InputWithLabel.tsx

@@ -17,6 +17,7 @@ function InputWithLabel({
 	onChange,
 	className,
 	closeIcon,
+	disabled,
 }: {
 	label: string;
 	initialValue?: string | number | null;
@@ -27,6 +28,7 @@ function InputWithLabel({
 	onChange: (value: string) => void;
 	className?: string;
 	closeIcon?: React.ReactNode;
+	disabled?: boolean;
 }): JSX.Element {
 	const [inputValue, setInputValue] = useState<string>(
 		initialValue ? initialValue.toString() : '',
@@ -53,6 +55,7 @@ function InputWithLabel({
 				type={type}
 				value={inputValue}
 				onChange={handleChange}
+				disabled={disabled}
 				name={label.toLowerCase()}
 				data-testid={`input-${label}`}
 			/>

frontend/src/components/QueryBuilderV2/QueryBuilderV2.tsx

@@ -1,11 +1,18 @@
 import { memo, useCallback, useEffect, useMemo, useRef } from 'react';
-import { OPERATORS, PANEL_TYPES } from 'constants/queryBuilder';
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import { PANEL_TYPES } from 'constants/queryBuilder';
 import { Formula } from 'container/QueryBuilder/components/Formula';
 import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
 import { IBuilderTraceOperator } from 'types/api/queryBuilder/queryBuilderData';
 import { DataSource } from 'types/common/queryBuilder';
 
+import { QueryBuilderField } from './queryBuilderFields.types';
+import {
+	mergeQueryBuilderFieldsConfig,
+	RAW_QUERY_FIELDS,
+	resolveQueryBuilderField,
+} from './queryBuilderFields.utils';
 import { QueryBuilderV2Provider } from './QueryBuilderV2Context';
 import { clearPreviousQuery } from './QueryV2/previousQuery.utils';
 import QueryFooter from './QueryV2/QueryFooter/QueryFooter';
@@ -14,12 +21,18 @@ import TraceOperator from './QueryV2/TraceOperator/TraceOperator';
 
 import './QueryBuilderV2.styles.scss';
 
+// Raw rows come from logs or spans; metrics only exist aggregated.
+const RAW_QUERY_SIGNALS = [
+	TelemetrytypesSignalDTO.logs,
+	TelemetrytypesSignalDTO.traces,
+];
+
 export const QueryBuilderV2 = memo(function QueryBuilderV2({
 	config,
 	panelType: newPanelType,
-	filterConfigs = {},
-	queryComponents,
-	isListViewPanel = false,
+	fieldsConfig,
+	allowedDataSources,
+	isRawQuery = false,
 	showOnlyWhereClause = false,
 	showTraceOperator = false,
 	version,
@@ -71,55 +84,48 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 		};
 	}, []);
 
-	const isMultiQueryAllowed = useMemo(
-		() => !isListViewPanel || showTraceOperator,
-		[showTraceOperator, isListViewPanel],
+	const resolvedConfig = useMemo(
+		() =>
+			mergeQueryBuilderFieldsConfig(
+				isRawQuery ? RAW_QUERY_FIELDS : undefined,
+				fieldsConfig,
+			),
+		[isRawQuery, fieldsConfig],
 	);
 
-	const listViewLogFilterConfigs: QueryBuilderProps['filterConfigs'] =
-		useMemo(() => {
-			const config: QueryBuilderProps['filterConfigs'] = {
-				stepInterval: { isHidden: true, isDisabled: true },
-				having: { isHidden: true, isDisabled: true },
-				filters: {
-					customKey: 'body',
-					customOp: OPERATORS.CONTAINS,
-				},
-			};
+	const additionalQueries = useMemo(
+		() =>
+			resolveQueryBuilderField(
+				QueryBuilderField.AdditionalQueries,
+				resolvedConfig,
+			),
+		[resolvedConfig],
+	);
 
-			return config;
-		}, []);
+	const formula = useMemo(
+		() => resolveQueryBuilderField(QueryBuilderField.Formula, resolvedConfig),
+		[resolvedConfig],
+	);
 
-	const listViewTracesFilterConfigs: QueryBuilderProps['filterConfigs'] =
-		useMemo(() => {
-			const config: QueryBuilderProps['filterConfigs'] = {
-				stepInterval: { isHidden: true, isDisabled: true },
-				having: { isHidden: true, isDisabled: true },
-				limit: { isHidden: true, isDisabled: true },
-				filters: {
-					customKey: 'body',
-					customOp: OPERATORS.CONTAINS,
-				},
-			};
+	const isMultiQueryAllowed = useMemo(
+		() => !additionalQueries.hidden && (!isRawQuery || showTraceOperator),
+		[additionalQueries.hidden, showTraceOperator, isRawQuery],
+	);
 
-			return config;
-		}, []);
+	const queryDataSources = useMemo(
+		() => allowedDataSources ?? (isRawQuery ? RAW_QUERY_SIGNALS : undefined),
+		[allowedDataSources, isRawQuery],
+	);
 
-	const queryFilterConfigs = useMemo(() => {
-		if (isListViewPanel) {
-			return currentQuery.builder.queryData[0].dataSource === DataSource.TRACES
-				? listViewTracesFilterConfigs
-				: listViewLogFilterConfigs;
-		}
-
-		return filterConfigs;
-	}, [
-		isListViewPanel,
-		filterConfigs,
-		currentQuery.builder.queryData,
-		listViewLogFilterConfigs,
-		listViewTracesFilterConfigs,
-	]);
+	// What the editor renders. A single-query builder edits the first query alone, so
+	// the query list beside it must not advertise ones there is no way to reach.
+	const renderedQueries = useMemo(
+		() =>
+			isMultiQueryAllowed
+				? currentQuery.builder.queryData
+				: currentQuery.builder.queryData.slice(0, 1),
+		[isMultiQueryAllowed, currentQuery.builder.queryData],
+	);
 
 	const traceOperator = useMemo((): IBuilderTraceOperator | undefined => {
 		if (
@@ -145,31 +151,46 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 		[showTraceOperator, traceOperator, hasAtLeastOneTraceQuery],
 	);
 
-	const shouldShowFooter = useMemo(
-		() =>
-			(!showOnlyWhereClause && !isListViewPanel) ||
-			(currentDataSource === DataSource.TRACES && showTraceOperator),
-		[isListViewPanel, showTraceOperator, showOnlyWhereClause, currentDataSource],
-	);
-
 	const showQueryList = useMemo(
-		() => (!showOnlyWhereClause && !isListViewPanel) || showTraceOperator,
-		[isListViewPanel, showOnlyWhereClause, showTraceOperator],
+		() => (!showOnlyWhereClause && !isRawQuery) || showTraceOperator,
+		[isRawQuery, showOnlyWhereClause, showTraceOperator],
 	);
 
 	const showFormula = useMemo(() => {
+		if (formula.hidden) {
+			return false;
+		}
+
 		if (currentDataSource === DataSource.TRACES) {
-			return !isListViewPanel;
+			return !isRawQuery;
 		}
 
 		return true;
-	}, [isListViewPanel, currentDataSource]);
+	}, [formula.hidden, isRawQuery, currentDataSource]);
 
 	const showAddTraceOperator = useMemo(
 		() => showTraceOperator && !traceOperator && hasAtLeastOneTraceQuery,
 		[showTraceOperator, traceOperator, hasAtLeastOneTraceQuery],
 	);
 
+	// Nothing left to add means no footer at all, rather than an empty bar under the
+	// last query.
+	const shouldShowFooter = useMemo(
+		() =>
+			(!additionalQueries.hidden || showFormula || showAddTraceOperator) &&
+			((!showOnlyWhereClause && !isRawQuery) ||
+				(currentDataSource === DataSource.TRACES && showTraceOperator)),
+		[
+			additionalQueries.hidden,
+			showFormula,
+			showAddTraceOperator,
+			isRawQuery,
+			showTraceOperator,
+			showOnlyWhereClause,
+			currentDataSource,
+		],
+	);
+
 	const handleKeyDown = useCallback(
 		(e: React.KeyboardEvent<HTMLDivElement>): void => {
 			const target = e.target as HTMLElement | null;
@@ -199,8 +220,8 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 							key={currentQuery.builder.queryData[0].queryName}
 							index={0}
 							query={currentQuery.builder.queryData[0]}
-							filterConfigs={queryFilterConfigs}
-							queryComponents={queryComponents}
+							fieldsConfig={fieldsConfig}
+							allowedDataSources={queryDataSources}
 							isMultiQueryAllowed={isMultiQueryAllowed}
 							showTraceOperator={showTraceOperator}
 							hasTraceOperator={hasTraceOperator}
@@ -208,7 +229,7 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 							isAvailableToDisable={false}
 							queryVariant={config?.queryVariant || 'dropdown'}
 							showOnlyWhereClause={showOnlyWhereClause}
-							isListViewPanel={isListViewPanel}
+							isRawQuery={isRawQuery}
 							signalSource={currentQuery.builder.queryData[0].source as 'meter' | ''}
 							onSignalSourceChange={onSignalSourceChange || ((): void => {})}
 							signalSourceChangeEnabled={signalSourceChangeEnabled}
@@ -216,14 +237,14 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 							savePreviousQuery={savePreviousQuery}
 						/>
 					) : (
-						currentQuery.builder.queryData.map((query, index) => (
+						renderedQueries.map((query, index) => (
 							<QueryV2
 								ref={containerRef}
 								key={query.queryName}
 								index={index}
 								query={query}
-								filterConfigs={queryFilterConfigs}
-								queryComponents={queryComponents}
+								fieldsConfig={fieldsConfig}
+								allowedDataSources={queryDataSources}
 								version={version}
 								isMultiQueryAllowed={isMultiQueryAllowed}
 								isAvailableToDisable={false}
@@ -231,7 +252,7 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 								hasTraceOperator={hasTraceOperator}
 								queryVariant={config?.queryVariant || 'dropdown'}
 								showOnlyWhereClause={showOnlyWhereClause}
-								isListViewPanel={isListViewPanel}
+								isRawQuery={isRawQuery}
 								signalSource={query.source as 'meter' | ''}
 								onSignalSourceChange={onSignalSourceChange || ((): void => {})}
 								signalSourceChangeEnabled={signalSourceChangeEnabled}
@@ -251,14 +272,7 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 
 									return (
 										<div key={formula.queryName} className="qb-formula">
-											<Formula
-												filterConfigs={filterConfigs}
-												query={query}
-												formula={formula}
-												index={index}
-												isAdditionalFilterEnable={false}
-												isQBV2
-											/>
+											<Formula query={query} formula={formula} index={index} isQBV2 />
 										</div>
 									);
 								})}
@@ -267,8 +281,13 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 
 					{shouldShowFooter && (
 						<QueryFooter
+							showAddQuery={!additionalQueries.hidden}
 							showAddFormula={showFormula}
+							addFormulaDisabled={formula.disabled}
+							addFormulaDisabledReason={formula.reason}
 							addNewBuilderQuery={addNewBuilderQuery}
+							addQueryDisabled={additionalQueries.disabled}
+							addQueryDisabledReason={additionalQueries.reason}
 							addNewFormula={addNewFormula}
 							addTraceOperator={addTraceOperator}
 							showAddTraceOperator={showAddTraceOperator}
@@ -277,7 +296,8 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 
 					{hasTraceOperator && (
 						<TraceOperator
-							isListViewPanel={isListViewPanel}
+							isRawQuery={isRawQuery}
+							fieldsConfig={resolvedConfig}
 							traceOperator={traceOperator as IBuilderTraceOperator}
 						/>
 					)}
@@ -285,7 +305,7 @@ export const QueryBuilderV2 = memo(function QueryBuilderV2({
 
 				{showQueryList && (
 					<div className="query-names-section">
-						{currentQuery.builder.queryData.map((query) => (
+						{renderedQueries.map((query) => (
 							<div key={query.queryName} className="query-name">
 								{query.queryName}
 							</div>

frontend/src/components/QueryBuilderV2/QueryV2/QueryAddOns/QueryAddOns.styles.scss

@@ -23,6 +23,11 @@
 		align-items: center;
 		justify-content: center;
 		gap: var(--margin-2);
+
+		&--disabled {
+			opacity: 0.45;
+			cursor: not-allowed;
+		}
 	}
 }
 

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

@@ -1,5 +1,6 @@
-import { useCallback, useEffect, useRef, useState } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { Button, Tooltip } from 'antd';
+import cx from 'classnames';
 import { ToggleGroupSimple } from '@signozhq/ui/toggle-group';
 import InputWithLabel from 'components/InputWithLabel/InputWithLabel';
 import { PANEL_TYPES } from 'constants/queryBuilder';
@@ -14,6 +15,16 @@ import { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
 import { MetricAggregation } from 'types/api/v5/queryRange';
 import { DataSource, ReduceOperators } from 'types/common/queryBuilder';
 
+import {
+	QueryBuilderField,
+	QueryBuilderFieldsConfig,
+} from '../../queryBuilderFields.types';
+import {
+	mergeQueryBuilderFieldsConfig,
+	RAW_QUERY_FIELDS,
+	resolveQueryBuilderFields,
+} from '../../queryBuilderFields.utils';
+
 import HavingFilter from './HavingFilter/HavingFilter';
 import { buildDefaultLegendFromGroupBy } from './utils';
 
@@ -22,34 +33,25 @@ import './QueryAddOns.styles.scss';
 interface AddOn {
 	icon: React.ReactNode;
 	label: string;
-	key: string;
+	key: QueryBuilderField;
 	description?: string;
 	docLink?: string;
 }
 
-const ADD_ONS_KEYS = {
-	GROUP_BY: 'group_by',
-	HAVING: 'having',
-	ORDER_BY: 'order_by',
-	LIMIT: 'limit',
-	LEGEND_FORMAT: 'legend_format',
-	REDUCE_TO: 'reduce_to',
+const ADD_ONS_KEYS_TO_QUERY_PATH: Partial<Record<QueryBuilderField, string>> = {
+	[QueryBuilderField.GroupBy]: 'groupBy',
+	[QueryBuilderField.Having]: 'having.expression',
+	[QueryBuilderField.OrderBy]: 'orderBy',
+	[QueryBuilderField.Limit]: 'limit',
+	[QueryBuilderField.Legend]: 'legend',
+	[QueryBuilderField.ReduceTo]: 'reduceTo',
 };
 
-const ADD_ONS_KEYS_TO_QUERY_PATH = {
-	[ADD_ONS_KEYS.GROUP_BY]: 'groupBy',
-	[ADD_ONS_KEYS.HAVING]: 'having.expression',
-	[ADD_ONS_KEYS.ORDER_BY]: 'orderBy',
-	[ADD_ONS_KEYS.LIMIT]: 'limit',
-	[ADD_ONS_KEYS.LEGEND_FORMAT]: 'legend',
-	[ADD_ONS_KEYS.REDUCE_TO]: 'reduceTo',
-};
-
-const ADD_ONS = [
+const ADD_ONS: AddOn[] = [
 	{
 		icon: <BarChart size={14} />,
 		label: 'Group By',
-		key: ADD_ONS_KEYS.GROUP_BY,
+		key: QueryBuilderField.GroupBy,
 		description:
 			'Break down data by attributes like service name, endpoint, status code, or region. Essential for spotting patterns and comparing performance across different segments.',
 		docLink: 'https://signoz.io/docs/querying/aggregation-grouping/#grouping',
@@ -57,7 +59,7 @@ const ADD_ONS = [
 	{
 		icon: <ScrollText size={14} />,
 		label: 'Having',
-		key: ADD_ONS_KEYS.HAVING,
+		key: QueryBuilderField.Having,
 		description:
 			'Filter grouped results based on aggregate conditions. Show only groups meeting specific criteria, like error rates > 5% or p99 latency > 500',
 		docLink:
@@ -66,7 +68,7 @@ const ADD_ONS = [
 	{
 		icon: <ScrollText size={14} />,
 		label: 'Order By',
-		key: ADD_ONS_KEYS.ORDER_BY,
+		key: QueryBuilderField.OrderBy,
 		description:
 			'Sort results to surface what matters most. Quickly identify slowest operations, most frequent errors, or highest resource consumers.',
 		docLink:
@@ -75,7 +77,7 @@ const ADD_ONS = [
 	{
 		icon: <ScrollText size={14} />,
 		label: 'Limit',
-		key: ADD_ONS_KEYS.LIMIT,
+		key: QueryBuilderField.Limit,
 		description:
 			'Show only the top/bottom N results. Perfect for focusing on outliers, reducing noise, and improving dashboard performance.',
 		docLink:
@@ -84,7 +86,7 @@ const ADD_ONS = [
 	{
 		icon: <ScrollText size={14} />,
 		label: 'Legend format',
-		key: ADD_ONS_KEYS.LEGEND_FORMAT,
+		key: QueryBuilderField.Legend,
 		description:
 			'Customize series labels using variables like {{service.name}}-{{endpoint}}. Makes charts readable at a glance during incident investigation.',
 		docLink:
@@ -92,10 +94,10 @@ const ADD_ONS = [
 	},
 ];
 
-const REDUCE_TO = {
+const REDUCE_TO: AddOn = {
 	icon: <ScrollText size={14} />,
 	label: 'Reduce to',
-	key: ADD_ONS_KEYS.REDUCE_TO,
+	key: QueryBuilderField.ReduceTo,
 	description:
 		'Apply mathematical operations like sum, average, min, max, or percentiles to reduce multiple time series into a single value.',
 	docLink:
@@ -154,26 +156,26 @@ function TooltipContent({
 function QueryAddOns({
 	query,
 	version,
-	isListViewPanel,
+	isRawQuery,
 	showReduceTo,
 	panelType,
 	index,
+	fieldsConfig,
 	isForTraceOperator = false,
 }: {
 	query: IBuilderQuery;
 	version: string;
-	isListViewPanel: boolean;
+	isRawQuery: boolean;
 	showReduceTo: boolean;
 	panelType: PANEL_TYPES | null;
 	index: number;
+	fieldsConfig?: QueryBuilderFieldsConfig;
 	isForTraceOperator?: boolean;
 }): JSX.Element {
-	const [addOns, setAddOns] = useState<AddOn[]>(ADD_ONS);
-
 	const [selectedViews, setSelectedViews] = useState<AddOn[]>([]);
 
 	const initializedRef = useRef(false);
-	const prevAvailableKeysRef = useRef<Set<string> | null>(null);
+	const prevAvailableKeysRef = useRef<Set<QueryBuilderField> | null>(null);
 
 	const { handleChangeQueryData } = useQueryOperations({
 		index,
@@ -184,40 +186,62 @@ function QueryAddOns({
 
 	const { handleSetQueryData } = useQueryBuilder();
 
-	useEffect(() => {
-		if (isListViewPanel) {
-			setAddOns([]);
+	const supportedAddOns = useMemo((): AddOn[] => {
+		let addOns: AddOn[];
 
-			setSelectedViews([
-				ADD_ONS.find((addOn) => addOn.key === ADD_ONS_KEYS.ORDER_BY) as AddOn,
-			]);
-
-			return;
-		}
-
-		let filteredAddOns: AddOn[];
 		if (panelType === PANEL_TYPES.VALUE) {
-			// Filter out all add-ons except legend format
-			filteredAddOns = ADD_ONS.filter(
-				(addOn) => addOn.key === ADD_ONS_KEYS.LEGEND_FORMAT,
-			);
+			addOns = ADD_ONS.filter((addOn) => addOn.key === QueryBuilderField.Legend);
+		} else if (query.dataSource === DataSource.METRICS) {
+			// Group by for metrics is offered by MetricsAggregateSection instead.
+			addOns = ADD_ONS.filter((addOn) => addOn.key !== QueryBuilderField.GroupBy);
 		} else {
-			filteredAddOns = Object.values(ADD_ONS);
-
-			if (query.dataSource === DataSource.METRICS) {
-				// Filter out group_by for metrics data source (handled in MetricsAggregateSection)
-				filteredAddOns = filteredAddOns.filter(
-					(addOn) => addOn.key !== ADD_ONS_KEYS.GROUP_BY,
-				);
-			}
+			addOns = [...ADD_ONS];
 		}
 
-		if (showReduceTo) {
-			filteredAddOns = [...filteredAddOns, REDUCE_TO];
-		}
-		setAddOns(filteredAddOns);
+		return showReduceTo ? [...addOns, REDUCE_TO] : addOns;
+	}, [panelType, query.dataSource, showReduceTo]);
 
-		const availableAddOnKeys = new Set(filteredAddOns.map((a) => a.key));
+	const resolvedFields = useMemo(
+		() =>
+			resolveQueryBuilderFields(
+				supportedAddOns.map((addOn) => addOn.key),
+				mergeQueryBuilderFieldsConfig(
+					isRawQuery ? RAW_QUERY_FIELDS : undefined,
+					fieldsConfig,
+				),
+			),
+		[supportedAddOns, fieldsConfig, isRawQuery],
+	);
+
+	const offeredAddOns = useMemo(
+		() =>
+			supportedAddOns.filter((addOn) => !resolvedFields.get(addOn.key)?.hidden),
+		[supportedAddOns, resolvedFields],
+	);
+
+	const pinnedAddOns = useMemo(
+		() => offeredAddOns.filter((addOn) => resolvedFields.get(addOn.key)?.pinned),
+		[offeredAddOns, resolvedFields],
+	);
+
+	const togglableAddOns = useMemo(
+		() => offeredAddOns.filter((addOn) => !resolvedFields.get(addOn.key)?.pinned),
+		[offeredAddOns, resolvedFields],
+	);
+
+	const isPinned = useCallback(
+		(key: QueryBuilderField): boolean => Boolean(resolvedFields.get(key)?.pinned),
+		[resolvedFields],
+	);
+
+	const isDisabled = useCallback(
+		(key: QueryBuilderField): boolean =>
+			Boolean(resolvedFields.get(key)?.disabled),
+		[resolvedFields],
+	);
+
+	useEffect(() => {
+		const availableAddOnKeys = new Set(offeredAddOns.map((a) => a.key));
 		const previousKeys = prevAvailableKeysRef.current;
 		const hasAvailabilityItemsChanged =
 			previousKeys !== null &&
@@ -231,27 +255,39 @@ function QueryAddOns({
 			const activeAddOnKeys = new Set(
 				Object.entries(ADD_ONS_KEYS_TO_QUERY_PATH)
 					.filter(([, path]) => hasValue(get(query, path)))
-					.map(([key]) => key),
+					.map(([key]) => key as QueryBuilderField),
 			);
 
-			// Initial seeding from query values on mount
+			// Initial seeding from query values on mount. A disabled field never opens.
 			setSelectedViews(
-				filteredAddOns.filter(
-					(addOn) =>
-						activeAddOnKeys.has(addOn.key) && availableAddOnKeys.has(addOn.key),
-				),
+				offeredAddOns.filter((addOn) => {
+					const resolved = resolvedFields.get(addOn.key);
+
+					return (
+						resolved?.pinned ||
+						(activeAddOnKeys.has(addOn.key) && !resolved?.disabled)
+					);
+				}),
 			);
 			return;
 		}
 
-		setSelectedViews((prev) =>
-			prev.filter((view) =>
-				filteredAddOns.some((addOn) => addOn.key === view.key),
-			),
-		);
-	}, [panelType, isListViewPanel, query, showReduceTo]);
+		setSelectedViews((prev) => {
+			const kept = prev.filter((view) => availableAddOnKeys.has(view.key));
+
+			const reopenedPinned = pinnedAddOns.filter(
+				(addOn) => !kept.some((view) => view.key === addOn.key),
+			);
+
+			return [...kept, ...reopenedPinned];
+		});
+	}, [offeredAddOns, pinnedAddOns, query]);
 
 	const handleOptionClick = (clickedAddOn: AddOn): void => {
+		if (isDisabled(clickedAddOn.key)) {
+			return;
+		}
+
 		const isAlreadySelected = selectedViews.some(
 			(view) => view.key === clickedAddOn.key,
 		);
@@ -265,7 +301,7 @@ function QueryAddOns({
 			// and existing group-by keys, prefill the legend using all group-by keys.
 			// This keeps existing custom legends intact and only helps seed a sensible default.
 			if (
-				clickedAddOn.key === ADD_ONS_KEYS.LEGEND_FORMAT &&
+				clickedAddOn.key === QueryBuilderField.Legend &&
 				isEmpty(query?.legend) &&
 				Array.isArray(query.groupBy) &&
 				query.groupBy.length > 0
@@ -310,9 +346,16 @@ function QueryAddOns({
 		[handleSetQueryData, index, query],
 	);
 
-	const handleRemoveView = useCallback((key: string): void => {
-		setSelectedViews((prev) => prev.filter((view) => view.key !== key));
-	}, []);
+	const handleRemoveView = useCallback(
+		(key: QueryBuilderField): void => {
+			if (isPinned(key)) {
+				return;
+			}
+
+			setSelectedViews((prev) => prev.filter((view) => view.key !== key));
+		},
+		[isPinned],
+	);
 
 	const handleChangeQueryLegend = useCallback(
 		(value: string) => {
@@ -341,7 +384,7 @@ function QueryAddOns({
 		<div className="query-add-ons" data-testid="query-add-ons">
 			{selectedViews.length > 0 && (
 				<div className="selected-add-ons-content">
-					{selectedViews.find((view) => view.key === 'group_by') && (
+					{selectedViews.find((view) => view.key === QueryBuilderField.GroupBy) && (
 						<div className="add-on-content" data-testid="group-by-content">
 							<div className="periscope-input-with-label">
 								<Tooltip
@@ -369,15 +412,17 @@ function QueryAddOns({
 										onChange={handleChangeGroupByKeys}
 									/>
 								</div>
-								<Button
-									className="close-btn periscope-btn ghost"
-									icon={<ChevronUp size={16} />}
-									onClick={(): void => handleRemoveView('group_by')}
-								/>
+								{!isPinned(QueryBuilderField.GroupBy) && (
+									<Button
+										className="close-btn periscope-btn ghost"
+										icon={<ChevronUp size={16} />}
+										onClick={(): void => handleRemoveView(QueryBuilderField.GroupBy)}
+									/>
+								)}
 							</div>
 						</div>
 					)}
-					{selectedViews.find((view) => view.key === 'having') && (
+					{selectedViews.find((view) => view.key === QueryBuilderField.Having) && (
 						<div className="add-on-content" data-testid="having-content">
 							<div className="periscope-input-with-label">
 								<Tooltip
@@ -397,11 +442,7 @@ function QueryAddOns({
 								</Tooltip>
 								<div className="input">
 									<HavingFilter
-										onClose={(): void => {
-											setSelectedViews((prev) =>
-												prev.filter((view) => view.key !== 'having'),
-											);
-										}}
+										onClose={(): void => handleRemoveView(QueryBuilderField.Having)}
 										onChange={handleChangeHaving}
 										queryData={query}
 									/>
@@ -409,7 +450,7 @@ function QueryAddOns({
 							</div>
 						</div>
 					)}
-					{selectedViews.find((view) => view.key === 'limit') && (
+					{selectedViews.find((view) => view.key === QueryBuilderField.Limit) && (
 						<div className="add-on-content" data-testid="limit-content">
 							<InputWithLabel
 								label="Limit"
@@ -417,16 +458,12 @@ function QueryAddOns({
 								onChange={handleChangeLimit}
 								initialValue={query?.limit ?? undefined}
 								placeholder="Enter limit"
-								onClose={(): void => {
-									setSelectedViews((prev) =>
-										prev.filter((view) => view.key !== 'limit'),
-									);
-								}}
+								onClose={(): void => handleRemoveView(QueryBuilderField.Limit)}
 								closeIcon={<ChevronUp size={16} />}
 							/>
 						</div>
 					)}
-					{selectedViews.find((view) => view.key === 'order_by') && (
+					{selectedViews.find((view) => view.key === QueryBuilderField.OrderBy) && (
 						<div className="add-on-content" data-testid="order-by-content">
 							<div className="periscope-input-with-label">
 								<Tooltip
@@ -449,22 +486,22 @@ function QueryAddOns({
 										entityVersion={version}
 										query={query}
 										onChange={handleChangeOrderByKeys}
-										isListViewPanel={isListViewPanel}
+										isRawQuery={isRawQuery}
 										isNewQueryV2
 									/>
 								</div>
-								{!isListViewPanel && (
+								{!isPinned(QueryBuilderField.OrderBy) && (
 									<Button
 										className="close-btn periscope-btn ghost"
 										icon={<ChevronUp size={16} />}
-										onClick={(): void => handleRemoveView('order_by')}
+										onClick={(): void => handleRemoveView(QueryBuilderField.OrderBy)}
 									/>
 								)}
 							</div>
 						</div>
 					)}
 
-					{selectedViews.find((view) => view.key === 'reduce_to') &&
+					{selectedViews.find((view) => view.key === QueryBuilderField.ReduceTo) &&
 						showReduceTo && (
 							<div className="add-on-content" data-testid="reduce-to-content">
 								<div className="periscope-input-with-label">
@@ -487,27 +524,25 @@ function QueryAddOns({
 										<ReduceToFilter query={query} onChange={handleChangeReduceToV5} />
 									</div>
 
-									<Button
-										className="close-btn periscope-btn ghost"
-										icon={<ChevronUp size={16} />}
-										onClick={(): void => handleRemoveView('reduce_to')}
-									/>
+									{!isPinned(QueryBuilderField.ReduceTo) && (
+										<Button
+											className="close-btn periscope-btn ghost"
+											icon={<ChevronUp size={16} />}
+											onClick={(): void => handleRemoveView(QueryBuilderField.ReduceTo)}
+										/>
+									)}
 								</div>
 							</div>
 						)}
 
-					{selectedViews.find((view) => view.key === 'legend_format') && (
+					{selectedViews.find((view) => view.key === QueryBuilderField.Legend) && (
 						<div className="add-on-content" data-testid="legend-format-content">
 							<InputWithLabel
 								label="Legend format"
 								placeholder="Write legend format"
 								onChange={handleChangeQueryLegend}
 								initialValue={isEmpty(query?.legend) ? undefined : query?.legend}
-								onClose={(): void => {
-									setSelectedViews((prev) =>
-										prev.filter((view) => view.key !== 'legend_format'),
-									);
-								}}
+								onClose={(): void => handleRemoveView(QueryBuilderField.Legend)}
 								closeIcon={<ChevronUp size={16} />}
 							/>
 						</div>
@@ -520,42 +555,49 @@ function QueryAddOns({
 				className="add-ons-tabs"
 				value={selectedViews.map((view) => view.key)}
 				onChange={(newKeys: string[]): void => {
-					const oldKeys = selectedViews.map((view) => view.key);
+					const oldKeys: string[] = selectedViews.map((view) => view.key);
 					const toggledKey =
-						newKeys.find((k) => !oldKeys.includes(k)) ??
-						oldKeys.find((k) => !newKeys.includes(k));
+						newKeys.find((key) => !oldKeys.includes(key)) ??
+						oldKeys.find((key) => !newKeys.includes(key));
 					if (!toggledKey) {
 						return;
 					}
-					const clickedAddOn = addOns.find((a) => a.key === toggledKey);
+					const clickedAddOn = togglableAddOns.find((a) => a.key === toggledKey);
 					if (clickedAddOn) {
 						handleOptionClick(clickedAddOn);
 					}
 				}}
-				items={addOns.map((addOn) => ({
-					value: addOn.key,
-					label: (
-						<Tooltip
-							title={
-								<TooltipContent
-									label={addOn.label}
-									description={addOn.description}
-									docLink={addOn.docLink}
-								/>
-							}
-							placement="top"
-							mouseEnterDelay={0.5}
-						>
-							<span
-								className="add-on-tab-title"
-								data-testid={`query-add-on-${addOn.key}`}
+				items={togglableAddOns.map((addOn) => {
+					const resolved = resolvedFields.get(addOn.key);
+
+					return {
+						value: addOn.key,
+						label: (
+							<Tooltip
+								title={
+									<TooltipContent
+										label={addOn.label}
+										description={resolved?.reason ?? addOn.description}
+										docLink={resolved?.disabled ? undefined : addOn.docLink}
+									/>
+								}
+								placement="top"
+								mouseEnterDelay={0.5}
 							>
-								{addOn.icon}
-								{addOn.label}
-							</span>
-						</Tooltip>
-					),
-				}))}
+								<span
+									className={cx('add-on-tab-title', {
+										'add-on-tab-title--disabled': resolved?.disabled,
+									})}
+									aria-disabled={resolved?.disabled}
+									data-testid={`query-add-on-${addOn.key}`}
+								>
+									{addOn.icon}
+									{addOn.label}
+								</span>
+							</Tooltip>
+						),
+					};
+				})}
 			/>
 		</div>
 	);

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

@@ -8,6 +8,12 @@ import {
 } from 'types/api/queryBuilder/queryBuilderData';
 import { DataSource } from 'types/common/queryBuilder';
 
+import {
+	QueryBuilderField,
+	QueryBuilderFieldsConfig,
+} from '../../queryBuilderFields.types';
+import { resolveQueryBuilderField } from '../../queryBuilderFields.utils';
+
 import QueryAggregationSelect from './QueryAggregationSelect';
 
 import './QueryAggregation.styles.scss';
@@ -18,24 +24,32 @@ function QueryAggregationOptions({
 	onAggregationIntervalChange,
 	onChange,
 	queryData,
+	fieldsConfig,
 }: {
 	dataSource: DataSource;
 	panelType?: string;
 	onAggregationIntervalChange: (value: number) => void;
 	onChange?: (value: string) => void;
 	queryData: IBuilderQuery | IBuilderTraceOperator;
+	fieldsConfig?: QueryBuilderFieldsConfig;
 }): JSX.Element {
-	const showAggregationInterval = useMemo(() => {
+	const stepInterval = useMemo(() => {
 		if (panelType === PANEL_TYPES.VALUE) {
-			return false;
+			return { hidden: true, disabled: false, reason: undefined };
 		}
 
-		if (dataSource === DataSource.TRACES || dataSource === DataSource.LOGS) {
-			return !(panelType === PANEL_TYPES.TABLE || panelType === PANEL_TYPES.PIE);
+		const isNonMetricSource =
+			dataSource === DataSource.TRACES || dataSource === DataSource.LOGS;
+
+		if (
+			isNonMetricSource &&
+			(panelType === PANEL_TYPES.TABLE || panelType === PANEL_TYPES.PIE)
+		) {
+			return { hidden: true, disabled: false, reason: undefined };
 		}
 
-		return true;
-	}, [dataSource, panelType]);
+		return resolveQueryBuilderField(QueryBuilderField.StepInterval, fieldsConfig);
+	}, [dataSource, panelType, fieldsConfig]);
 
 	const handleAggregationIntervalChange = (value: string): void => {
 		onAggregationIntervalChange(Number(value));
@@ -57,22 +71,24 @@ function QueryAggregationOptions({
 					}
 				/>
 
-				{showAggregationInterval && (
+				{!stepInterval.hidden && (
 					<div className="query-aggregation-interval">
 						<Tooltip
 							title={
-								<div>
-									Set the time interval for aggregation
-									<br />
-									<a
-										href="https://signoz.io/docs/userguide/query-builder-v5/#temporal-aggregation-within-each-time-series"
-										target="_blank"
-										rel="noopener noreferrer"
-										style={{ color: '#1890ff', textDecoration: 'underline' }}
-									>
-										Learn about step intervals
-									</a>
-								</div>
+								stepInterval.reason ?? (
+									<div>
+										Set the time interval for aggregation
+										<br />
+										<a
+											href="https://signoz.io/docs/userguide/query-builder-v5/#temporal-aggregation-within-each-time-series"
+											target="_blank"
+											rel="noopener noreferrer"
+											style={{ color: '#1890ff', textDecoration: 'underline' }}
+										>
+											Learn about step intervals
+										</a>
+									</div>
+								)
 							}
 							placement="top"
 						>
@@ -92,6 +108,7 @@ function QueryAggregationOptions({
 								placeholder="Auto"
 								type="number"
 								onChange={handleAggregationIntervalChange}
+								disabled={stepInterval.disabled}
 								labelAfter
 							/>
 						</div>
@@ -105,6 +122,7 @@ function QueryAggregationOptions({
 QueryAggregationOptions.defaultProps = {
 	panelType: null,
 	onChange: undefined,
+	fieldsConfig: undefined,
 };
 
 export default QueryAggregationOptions;

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

@@ -17,13 +17,13 @@ function TraceOperatorSection({
 	const { currentQuery, panelType } = useQueryBuilder();
 
 	const showTraceOperatorWarning = useMemo(() => {
-		const isListViewPanel =
+		const isRawQueryPanel =
 			panelType === PANEL_TYPES.LIST || panelType === PANEL_TYPES.TRACE;
 		const hasMultipleQueries = currentQuery.builder.queryData.length > 1;
 		const hasTraceOperator =
 			currentQuery.builder.queryTraceOperator &&
 			currentQuery.builder.queryTraceOperator.length > 0;
-		return isListViewPanel && hasMultipleQueries && !hasTraceOperator;
+		return isRawQueryPanel && hasMultipleQueries && !hasTraceOperator;
 	}, [
 		currentQuery?.builder?.queryData,
 		currentQuery?.builder?.queryTraceOperator,
@@ -77,50 +77,74 @@ export default function QueryFooter({
 	addNewBuilderQuery,
 	addNewFormula,
 	addTraceOperator,
+	showAddQuery = true,
 	showAddFormula = true,
 	showAddTraceOperator = false,
+	addQueryDisabled = false,
+	addQueryDisabledReason,
+	addFormulaDisabled = false,
+	addFormulaDisabledReason,
 }: {
 	addNewBuilderQuery: () => void;
 	addNewFormula: () => void;
 	addTraceOperator?: () => void;
 	showAddTraceOperator: boolean;
+	showAddQuery?: boolean;
 	showAddFormula?: boolean;
+	addQueryDisabled?: boolean;
+	addQueryDisabledReason?: string;
+	addFormulaDisabled?: boolean;
+	addFormulaDisabledReason?: string;
 }): JSX.Element {
 	return (
 		<div className="qb-footer">
 			<div className="qb-footer-container">
-				<div className="qb-add-new-query">
-					<Tooltip title={<div style={{ textAlign: 'center' }}>Add New Query</div>}>
-						<Button
-							className="add-new-query-button periscope-btn "
-							icon={<Plus size={16} />}
-							onClick={addNewBuilderQuery}
-						/>
-					</Tooltip>
-				</div>
+				{showAddQuery && (
+					<div className="qb-add-new-query">
+						<Tooltip
+							title={
+								addQueryDisabledReason ?? (
+									<div style={{ textAlign: 'center' }}>Add New Query</div>
+								)
+							}
+						>
+							<Button
+								className="add-new-query-button periscope-btn "
+								data-testid="add-new-query-button"
+								icon={<Plus size={16} />}
+								onClick={addNewBuilderQuery}
+								disabled={addQueryDisabled}
+							/>
+						</Tooltip>
+					</div>
+				)}
 
 				{showAddFormula && (
 					<div className="qb-add-formula">
 						<Tooltip
 							title={
-								<div style={{ textAlign: 'center' }}>
-									Add New Formula
-									<Typography.Link
-										href="https://signoz.io/docs/querying/multi-query-analysis/#advanced-comparisons"
-										target="_blank"
-										style={{ textDecoration: 'underline' }}
-									>
-										{' '}
-										<br />
-										Learn more
-									</Typography.Link>
-								</div>
+								addFormulaDisabledReason ?? (
+									<div style={{ textAlign: 'center' }}>
+										Add New Formula
+										<Typography.Link
+											href="https://signoz.io/docs/querying/multi-query-analysis/#advanced-comparisons"
+											target="_blank"
+											style={{ textDecoration: 'underline' }}
+										>
+											{' '}
+											<br />
+											Learn more
+										</Typography.Link>
+									</div>
+								)
 							}
 						>
 							<Button
 								className="add-formula-button periscope-btn "
+								data-testid="add-formula-button"
 								icon={<Sigma size={16} />}
 								onClick={addNewFormula}
+								disabled={addFormulaDisabled}
 							>
 								Add Formula
 							</Button>

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

@@ -20,6 +20,13 @@ import { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
 import { HandleChangeQueryDataV5 } from 'types/common/operations.types';
 import { DataSource } from 'types/common/queryBuilder';
 
+import { QueryBuilderField } from '../queryBuilderFields.types';
+import {
+	mergeQueryBuilderFieldsConfig,
+	RAW_QUERY_FIELDS,
+	resolveQueryBuilderField,
+} from '../queryBuilderFields.utils';
+
 import MetricsAggregateSection from './MerticsAggregateSection/MetricsAggregateSection';
 import { MetricsSelect } from './MetricsSelect/MetricsSelect';
 import QueryAddOns from './QueryAddOns/QueryAddOns';
@@ -31,8 +38,7 @@ export const QueryV2 = forwardRef(function QueryV2(
 		index,
 		queryVariant,
 		query,
-		filterConfigs,
-		isListViewPanel = false,
+		isRawQuery = false,
 		showTraceOperator = false,
 		hasTraceOperator = false,
 		version,
@@ -43,6 +49,8 @@ export const QueryV2 = forwardRef(function QueryV2(
 		signalSourceChangeEnabled = false,
 		queriesCount = 1,
 		savePreviousQuery = false,
+		fieldsConfig,
+		allowedDataSources,
 	}: QueryProps & {
 		onSignalSourceChange: (value: string) => void;
 		signalSourceChangeEnabled: boolean;
@@ -53,7 +61,7 @@ export const QueryV2 = forwardRef(function QueryV2(
 ): JSX.Element {
 	const { cloneQuery, panelType } = useQueryBuilder();
 
-	const showFunctions = query?.functions?.length > 0;
+	const hasQueryFunctions = query?.functions?.length > 0;
 	const { dataSource, builderQueryType } = query;
 
 	const [isCollapsed, setIsCollapsed] = useState(false);
@@ -66,8 +74,7 @@ export const QueryV2 = forwardRef(function QueryV2(
 	} = useQueryOperations({
 		index,
 		query,
-		filterConfigs,
-		isListViewPanel,
+		isRawQuery,
 		entityVersion: version,
 		savePreviousQuery,
 	});
@@ -99,14 +106,31 @@ export const QueryV2 = forwardRef(function QueryV2(
 		[dataSource, builderQueryType],
 	);
 
+	const resolvedConfig = useMemo(
+		() =>
+			mergeQueryBuilderFieldsConfig(
+				isRawQuery ? RAW_QUERY_FIELDS : undefined,
+				fieldsConfig,
+			),
+		[isRawQuery, fieldsConfig],
+	);
+
+	const aggregation = useMemo(
+		() => resolveQueryBuilderField(QueryBuilderField.Aggregation, resolvedConfig),
+		[resolvedConfig],
+	);
+
+	const functions = useMemo(
+		() => resolveQueryBuilderField(QueryBuilderField.Functions, resolvedConfig),
+		[resolvedConfig],
+	);
+
 	const showInlineQuerySearch = useMemo(() => {
 		if (!showTraceOperator) {
 			return false;
 		}
-		return (
-			dataSource === DataSource.TRACES && (hasTraceOperator || isListViewPanel)
-		);
-	}, [hasTraceOperator, isListViewPanel, showTraceOperator, dataSource]);
+		return dataSource === DataSource.TRACES && (hasTraceOperator || isRawQuery);
+	}, [hasTraceOperator, isRawQuery, showTraceOperator, dataSource]);
 
 	const handleChangeAggregateEvery = useCallback(
 		(value: IBuilderQuery['stepInterval']) => {
@@ -149,12 +173,15 @@ export const QueryV2 = forwardRef(function QueryV2(
 									hasTraceOperator={hasTraceOperator}
 									isMetricsDataSource={dataSource === DataSource.METRICS}
 									showFunctions={
-										(version && version === ENTITY_VERSION_V4) ||
-										query.dataSource === DataSource.LOGS ||
-										query.dataSource === DataSource.METRICS ||
-										showFunctions ||
-										false
+										!functions.hidden &&
+										((version && version === ENTITY_VERSION_V4) ||
+											query.dataSource === DataSource.LOGS ||
+											query.dataSource === DataSource.METRICS ||
+											hasQueryFunctions ||
+											false)
 									}
+									functionsDisabled={functions.disabled}
+									functionsDisabledReason={functions.reason}
 									isCollapsed={isCollapsed}
 									showTraceOperator={showTraceOperator}
 									entityType="query"
@@ -167,7 +194,8 @@ export const QueryV2 = forwardRef(function QueryV2(
 									onQueryFunctionsUpdates={handleQueryFunctionsUpdates}
 									showDeleteButton={false}
 									showCloneOption={false}
-									isListViewPanel={isListViewPanel}
+									isRawQuery={isRawQuery}
+									allowedDataSources={allowedDataSources}
 									index={index}
 									queryVariant={queryVariant}
 									onChangeDataSource={handleChangeDataSource}
@@ -267,7 +295,7 @@ export const QueryV2 = forwardRef(function QueryV2(
 						</div>
 
 						{!showOnlyWhereClause &&
-							!isListViewPanel &&
+							!aggregation.hidden &&
 							!(hasTraceOperator && dataSource === DataSource.TRACES) &&
 							dataSource !== DataSource.METRICS && (
 								<QueryAggregation
@@ -277,6 +305,7 @@ export const QueryV2 = forwardRef(function QueryV2(
 									onAggregationIntervalChange={handleChangeAggregateEvery}
 									onChange={handleChangeAggregation}
 									queryData={query}
+									fieldsConfig={fieldsConfig}
 								/>
 							)}
 
@@ -297,9 +326,10 @@ export const QueryV2 = forwardRef(function QueryV2(
 									index={index}
 									query={query}
 									version="v3"
-									isListViewPanel={isListViewPanel}
+									isRawQuery={isRawQuery}
 									showReduceTo={showReduceTo}
 									panelType={panelType}
+									fieldsConfig={fieldsConfig}
 								/>
 							)}
 					</div>

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

@@ -11,6 +11,7 @@ import {
 } from 'types/api/queryBuilder/queryBuilderData';
 import { DataSource } from 'types/common/queryBuilder';
 
+import { QueryBuilderFieldsConfig } from '../../queryBuilderFields.types';
 import QueryAddOns from '../QueryAddOns/QueryAddOns';
 import QueryAggregation from '../QueryAggregation/QueryAggregation';
 import TraceOperatorEditor from './TraceOperatorEditor';
@@ -19,10 +20,12 @@ import './TraceOperator.styles.scss';
 
 export default function TraceOperator({
 	traceOperator,
-	isListViewPanel = false,
+	isRawQuery = false,
+	fieldsConfig,
 }: {
 	traceOperator: IBuilderTraceOperator;
-	isListViewPanel?: boolean;
+	isRawQuery?: boolean;
+	fieldsConfig?: QueryBuilderFieldsConfig;
 }): JSX.Element {
 	const { panelType, removeTraceOperator } = useQueryBuilder();
 	const { handleChangeQueryData } = useQueryOperations({
@@ -58,12 +61,12 @@ export default function TraceOperator({
 	);
 
 	return (
-		<div className={cx('qb-trace-operator', !isListViewPanel && 'non-list-view')}>
+		<div className={cx('qb-trace-operator', !isRawQuery && 'non-list-view')}>
 			<div className="qb-trace-operator-container">
 				<div
 					className={cx(
 						'qb-trace-operator-label-with-input',
-						!isListViewPanel && 'qb-trace-operator-arrow',
+						!isRawQuery && 'qb-trace-operator-arrow',
 					)}
 				>
 					<Typography.Text className="label">Trace Operator</Typography.Text>
@@ -76,9 +79,9 @@ export default function TraceOperator({
 					</div>
 				</div>
 
-				{!isListViewPanel && (
+				{!isRawQuery && (
 					<div className="qb-trace-operator-aggregation-container">
-						<div className={cx(!isListViewPanel && 'qb-trace-operator-arrow')}>
+						<div className={cx(!isRawQuery && 'qb-trace-operator-arrow')}>
 							<QueryAggregation
 								dataSource={DataSource.TRACES}
 								key={`query-search-${traceOperator.queryName}`}
@@ -86,12 +89,13 @@ export default function TraceOperator({
 								onAggregationIntervalChange={handleChangeAggregateEvery}
 								onChange={handleChangeAggregation}
 								queryData={traceOperator}
+								fieldsConfig={fieldsConfig}
 							/>
 						</div>
 						<div
 							className={cx(
 								'qb-trace-operator-add-ons-container',
-								!isListViewPanel && 'qb-trace-operator-arrow',
+								!isRawQuery && 'qb-trace-operator-arrow',
 							)}
 						>
 							<QueryAddOns
@@ -99,9 +103,10 @@ export default function TraceOperator({
 								query={traceOperator}
 								version="v3"
 								isForTraceOperator
-								isListViewPanel={false}
+								isRawQuery={false}
 								showReduceTo={false}
 								panelType={panelType}
+								fieldsConfig={fieldsConfig}
 							/>
 						</div>
 					</div>

frontend/src/components/QueryBuilderV2/QueryV2/__tests__/QueryV2.test.tsx

@@ -142,7 +142,6 @@ describe('QueryBuilderV2 + QueryV2 - base render', () => {
 			isMetricsDataSource: false,
 			operators: [],
 			spaceAggregationOptions: [],
-			listOfAdditionalFilters: [],
 			handleChangeOperator: jest.fn(),
 			handleSpaceAggregationChange: jest.fn(),
 			handleChangeAggregatorAttribute: jest.fn(),
@@ -152,7 +151,6 @@ describe('QueryBuilderV2 + QueryV2 - base render', () => {
 				jest.fn() as unknown as ReturnType<UseQueryOperations>['handleChangeQueryData'],
 			handleChangeFormulaData: jest.fn(),
 			handleQueryFunctionsUpdates: handleQueryFunctionsUpdatesMock,
-			listOfAdditionalFormulaFilters: [],
 		});
 	});
 

frontend/src/components/QueryBuilderV2/__tests__/QueryAddOns.test.tsx

@@ -95,7 +95,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={baseQuery()}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo
 				panelType={PANEL_TYPES.VALUE}
 				index={0}
@@ -119,7 +119,7 @@ describe('QueryAddOns', () => {
 					groupBy: ['service.name'],
 				})}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo={false}
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -135,7 +135,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={baseQuery()}
 				version="v5"
-				isListViewPanel
+				isRawQuery
 				showReduceTo={false}
 				panelType={PANEL_TYPES.LIST}
 				index={0}
@@ -151,7 +151,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={baseQuery({ limit: 5 })}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo={false}
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -176,7 +176,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={query}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo={false}
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -195,7 +195,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={baseQuery()}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -211,7 +211,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={baseQuery({ reduceTo: ReduceOperators.SUM })}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -234,7 +234,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={query}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -286,7 +286,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={query}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo={false}
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}
@@ -314,7 +314,7 @@ describe('QueryAddOns', () => {
 			<QueryAddOns
 				query={query}
 				version="v5"
-				isListViewPanel={false}
+				isRawQuery={false}
 				showReduceTo={false}
 				panelType={PANEL_TYPES.TIME_SERIES}
 				index={0}

frontend/src/components/QueryBuilderV2/__tests__/QueryFooter.test.tsx

@@ -0,0 +1,46 @@
+import { render, screen } from 'tests/test-utils';
+
+import QueryFooter from '../QueryV2/QueryFooter/QueryFooter';
+
+jest.mock('hooks/queryBuilder/useQueryBuilder', () => ({
+	useQueryBuilder: (): {
+		currentQuery: { builder: { queryData: unknown[] } };
+		panelType: string;
+	} => ({
+		currentQuery: { builder: { queryData: [] } },
+		panelType: 'time_series',
+	}),
+}));
+
+const noop = (): void => {};
+
+describe('QueryFooter', () => {
+	it('offers both buttons by default', () => {
+		render(
+			<QueryFooter
+				addNewBuilderQuery={noop}
+				addNewFormula={noop}
+				showAddTraceOperator={false}
+			/>,
+		);
+
+		expect(screen.getByTestId('add-new-query-button')).toBeInTheDocument();
+		expect(screen.getByTestId('add-formula-button')).toBeInTheDocument();
+	});
+
+	// A kind whose request takes a single query (Heatmap) hides the button outright
+	// rather than disabling it — a query it adds is one the builder cannot render.
+	it('drops the Add New Query button when the caller withholds it', () => {
+		render(
+			<QueryFooter
+				addNewBuilderQuery={noop}
+				addNewFormula={noop}
+				showAddQuery={false}
+				showAddTraceOperator={false}
+			/>,
+		);
+
+		expect(screen.queryByTestId('add-new-query-button')).not.toBeInTheDocument();
+		expect(screen.getByTestId('add-formula-button')).toBeInTheDocument();
+	});
+});

frontend/src/components/QueryBuilderV2/__tests__/queryBuilderFields.utils.test.ts

@@ -0,0 +1,140 @@
+import { QueryBuilderField } from '../queryBuilderFields.types';
+import {
+	mergeQueryBuilderFieldsConfig,
+	RAW_QUERY_FIELDS,
+	resolveQueryBuilderField,
+	resolveQueryBuilderFields,
+} from '../queryBuilderFields.utils';
+
+const SUPPORTED = [
+	QueryBuilderField.GroupBy,
+	QueryBuilderField.Having,
+	QueryBuilderField.OrderBy,
+	QueryBuilderField.Limit,
+	QueryBuilderField.Legend,
+];
+
+describe('resolveQueryBuilderField', () => {
+	it('leaves an unconfigured field available', () => {
+		expect(resolveQueryBuilderField(QueryBuilderField.Having)).toStrictEqual({
+			hidden: false,
+			disabled: false,
+			pinned: false,
+		});
+	});
+
+	it('hides a field configured hidden', () => {
+		const resolved = resolveQueryBuilderField(QueryBuilderField.Having, {
+			[QueryBuilderField.Having]: { state: 'hidden' },
+		});
+
+		expect(resolved.hidden).toBe(true);
+		expect(resolved.disabled).toBe(false);
+	});
+
+	it('carries the reason through on a disabled field', () => {
+		const resolved = resolveQueryBuilderField(QueryBuilderField.Having, {
+			[QueryBuilderField.Having]: {
+				state: 'disabled',
+				reason: 'Having filters aggregated results.',
+			},
+		});
+
+		expect(resolved).toStrictEqual({
+			hidden: false,
+			disabled: true,
+			reason: 'Having filters aggregated results.',
+			pinned: false,
+		});
+	});
+
+	it('pins a field configured pinned', () => {
+		const resolved = resolveQueryBuilderField(QueryBuilderField.OrderBy, {
+			[QueryBuilderField.OrderBy]: { state: 'pinned' },
+		});
+
+		expect(resolved.pinned).toBe(true);
+		expect(resolved.hidden).toBe(false);
+	});
+
+	it('only ever resolves one state at a time', () => {
+		const resolved = resolveQueryBuilderField(QueryBuilderField.Limit, {
+			[QueryBuilderField.Limit]: { state: 'disabled', reason: 'why' },
+		});
+
+		expect([resolved.hidden, resolved.disabled, resolved.pinned]).toStrictEqual([
+			false,
+			true,
+			false,
+		]);
+	});
+});
+
+describe('resolveQueryBuilderFields', () => {
+	it('resolves every supported field and nothing else', () => {
+		const resolved = resolveQueryBuilderFields(SUPPORTED);
+
+		expect([...resolved.keys()]).toStrictEqual(SUPPORTED);
+	});
+
+	it('cannot widen beyond what the builder supports', () => {
+		const resolved = resolveQueryBuilderFields([QueryBuilderField.Legend], {
+			[QueryBuilderField.ReduceTo]: { state: 'pinned' },
+		});
+
+		expect(resolved.has(QueryBuilderField.ReduceTo)).toBe(false);
+	});
+});
+
+describe('mergeQueryBuilderFieldsConfig', () => {
+	it('returns the override when there is no baseline', () => {
+		const override = { [QueryBuilderField.Limit]: { state: 'hidden' } } as const;
+
+		expect(mergeQueryBuilderFieldsConfig(undefined, override)).toBe(override);
+	});
+
+	it('returns the baseline when there is no override', () => {
+		expect(mergeQueryBuilderFieldsConfig(RAW_QUERY_FIELDS, undefined)).toBe(
+			RAW_QUERY_FIELDS,
+		);
+	});
+
+	it('lets the override win per field, leaving the rest of the baseline intact', () => {
+		const merged = mergeQueryBuilderFieldsConfig(RAW_QUERY_FIELDS, {
+			[QueryBuilderField.Having]: { state: 'disabled', reason: 'no aggregation' },
+		});
+
+		expect(merged?.[QueryBuilderField.Having]).toStrictEqual({
+			state: 'disabled',
+			reason: 'no aggregation',
+		});
+		expect(merged?.[QueryBuilderField.GroupBy]).toStrictEqual({
+			state: 'hidden',
+		});
+		expect(merged?.[QueryBuilderField.OrderBy]).toStrictEqual({
+			state: 'pinned',
+		});
+	});
+});
+
+describe('RAW_QUERY_FIELDS', () => {
+	it('reduces an aggregate surface to a pinned order by', () => {
+		const resolved = resolveQueryBuilderFields(SUPPORTED, RAW_QUERY_FIELDS);
+
+		const visible = [...resolved.entries()]
+			.filter(([, field]) => !field.hidden)
+			.map(([key]) => key);
+
+		expect(visible).toStrictEqual([QueryBuilderField.OrderBy]);
+		expect(resolved.get(QueryBuilderField.OrderBy)?.pinned).toBe(true);
+	});
+
+	it('leaves additional queries alone, so trace matching still allows several', () => {
+		expect(
+			resolveQueryBuilderField(
+				QueryBuilderField.AdditionalQueries,
+				RAW_QUERY_FIELDS,
+			).hidden,
+		).toBe(false);
+	});
+});

frontend/src/components/QueryBuilderV2/queryBuilderFields.types.ts

@@ -0,0 +1,36 @@
+/**
+ * Everything the query builder can surface.
+ *
+ * The per-query values double as the add-on identities the builder renders
+ * (`data-testid="query-add-on-<value>"`), so they are part of the DOM contract and must
+ * not be renamed to match the member names.
+ */
+export enum QueryBuilderField {
+	// Per query
+	Aggregation = 'aggregation',
+	StepInterval = 'step_interval',
+	Functions = 'functions',
+	GroupBy = 'group_by',
+	Having = 'having',
+	OrderBy = 'order_by',
+	Limit = 'limit',
+	Legend = 'legend_format',
+	ReduceTo = 'reduce_to',
+	// Builder level
+	Formula = 'formula',
+	AdditionalQueries = 'additional_queries',
+}
+
+/** `reason` is required on `disabled`: an inert control the user can see has to explain itself. */
+export type QueryBuilderFieldRule =
+	| { state: 'hidden' }
+	| { state: 'disabled'; reason: string }
+	| { state: 'pinned' };
+
+/**
+ * A caller's narrowing of the builder's surface. The builder works out which fields suit
+ * the current data source and panel type first; this can only take away from that set.
+ */
+export type QueryBuilderFieldsConfig = Partial<
+	Record<QueryBuilderField, QueryBuilderFieldRule>
+>;

frontend/src/components/QueryBuilderV2/queryBuilderFields.utils.ts

@@ -0,0 +1,88 @@
+import {
+	QueryBuilderField,
+	QueryBuilderFieldRule,
+	QueryBuilderFieldsConfig,
+} from './queryBuilderFields.types';
+
+export interface ResolvedQueryBuilderField {
+	hidden: boolean;
+	disabled: boolean;
+	reason?: string;
+	/** Rendered open, not dismissable, and kept out of the add-on toggle bar. */
+	pinned: boolean;
+}
+
+const AVAILABLE: ResolvedQueryBuilderField = {
+	hidden: false,
+	disabled: false,
+	pinned: false,
+};
+
+function fromRule(rule: QueryBuilderFieldRule): ResolvedQueryBuilderField {
+	switch (rule.state) {
+		case 'hidden':
+			return { hidden: true, disabled: false, pinned: false };
+		case 'disabled':
+			return {
+				hidden: false,
+				disabled: true,
+				reason: rule.reason,
+				pinned: false,
+			};
+		case 'pinned':
+			return { hidden: false, disabled: false, pinned: true };
+		default:
+			return AVAILABLE;
+	}
+}
+
+export function resolveQueryBuilderField(
+	field: QueryBuilderField,
+	config?: QueryBuilderFieldsConfig,
+): ResolvedQueryBuilderField {
+	const rule = config?.[field];
+
+	return rule ? fromRule(rule) : AVAILABLE;
+}
+
+/**
+ * Fields absent from `supported` are hidden whatever the config says, so a config can
+ * only ever take away.
+ */
+export function resolveQueryBuilderFields(
+	supported: readonly QueryBuilderField[],
+	config?: QueryBuilderFieldsConfig,
+): Map<QueryBuilderField, ResolvedQueryBuilderField> {
+	return new Map(
+		supported.map((field) => [field, resolveQueryBuilderField(field, config)]),
+	);
+}
+
+/**
+ * The surface a raw-row builder starts from, layered under a caller's own config.
+ * `AdditionalQueries` is deliberately absent — a raw trace builder still takes several
+ * queries when trace matching is on.
+ */
+export const RAW_QUERY_FIELDS: QueryBuilderFieldsConfig = {
+	[QueryBuilderField.Aggregation]: { state: 'hidden' },
+	[QueryBuilderField.StepInterval]: { state: 'hidden' },
+	[QueryBuilderField.Functions]: { state: 'hidden' },
+	[QueryBuilderField.GroupBy]: { state: 'hidden' },
+	[QueryBuilderField.Having]: { state: 'hidden' },
+	[QueryBuilderField.Limit]: { state: 'hidden' },
+	[QueryBuilderField.Legend]: { state: 'hidden' },
+	[QueryBuilderField.ReduceTo]: { state: 'hidden' },
+	[QueryBuilderField.Formula]: { state: 'hidden' },
+	[QueryBuilderField.OrderBy]: { state: 'pinned' },
+};
+
+export function mergeQueryBuilderFieldsConfig(
+	baseline: QueryBuilderFieldsConfig | undefined,
+	override: QueryBuilderFieldsConfig | undefined,
+): QueryBuilderFieldsConfig | undefined {
+	if (!baseline) {
+		return override;
+	}
+
+	return override ? { ...baseline, ...override } : baseline;
+}

frontend/src/constants/panelTypes.ts

@@ -31,6 +31,8 @@ export const getComponentForPanelType = (
 		[PANEL_TYPES.BAR]: Uplot,
 		[PANEL_TYPES.PIE]: null,
 		[PANEL_TYPES.HISTOGRAM]: Uplot,
+		// V2-only kind; it renders through the V2 panel registry.
+		[PANEL_TYPES.HEATMAP]: null,
 		[PANEL_TYPES.EMPTY_WIDGET]: null,
 	};
 

frontend/src/constants/queryBuilder.ts

@@ -32,7 +32,6 @@ import {
 	MeterAggregateOperator,
 	MetricAggregateOperator,
 	NumberOperators,
-	QueryAdditionalFilter,
 	QueryBuilderData,
 	ReduceOperators,
 	StringOperators,
@@ -104,43 +103,6 @@ export const metricsSpaceAggregationOperatorsByType = {
 	ExponentialHistogram: metricsHistogramSpaceAggregateOperatorOptions,
 };
 
-export const mapOfQueryFilters: Record<DataSource, QueryAdditionalFilter[]> = {
-	metrics: [
-		{ text: 'Aggregation interval', field: 'stepInterval' },
-		{ text: 'Having', field: 'having' },
-	],
-	logs: [
-		{ text: 'Order by', field: 'orderBy' },
-		{ text: 'Limit', field: 'limit' },
-		{ text: 'Having', field: 'having' },
-		{ text: 'Aggregation interval', field: 'stepInterval' },
-	],
-	traces: [
-		{ text: 'Order by', field: 'orderBy' },
-		{ text: 'Limit', field: 'limit' },
-		{ text: 'Having', field: 'having' },
-		{ text: 'Aggregation interval', field: 'stepInterval' },
-	],
-};
-
-const commonFormulaFilters: QueryAdditionalFilter[] = [
-	{
-		text: 'Having',
-		field: 'having',
-	},
-	{ text: 'Order by', field: 'orderBy' },
-	{ text: 'Limit', field: 'limit' },
-];
-
-export const mapOfFormulaToFilters: Record<
-	DataSource,
-	QueryAdditionalFilter[]
-> = {
-	metrics: commonFormulaFilters,
-	logs: commonFormulaFilters,
-	traces: commonFormulaFilters,
-};
-
 export const REDUCE_TO_VALUES: SelectOption<ReduceOperators, string>[] = [
 	{ value: ReduceOperators.LAST, label: 'Latest of values in timeframe' },
 	{ value: ReduceOperators.SUM, label: 'Sum of values in timeframe' },
@@ -376,6 +338,7 @@ export enum PANEL_TYPES {
 	BAR = 'bar',
 	PIE = 'pie',
 	HISTOGRAM = 'histogram',
+	HEATMAP = 'heatmap',
 	EMPTY_WIDGET = 'EMPTY_WIDGET',
 }
 
@@ -623,6 +586,7 @@ export const PANEL_TYPES_INITIAL_QUERY: Record<PANEL_TYPES, Query> = {
 	[PANEL_TYPES.BAR]: initialQueriesMap.metrics,
 	[PANEL_TYPES.PIE]: initialQueriesMap.metrics,
 	[PANEL_TYPES.HISTOGRAM]: initialQueriesMap.metrics,
+	[PANEL_TYPES.HEATMAP]: initialQueriesMap.metrics,
 	[PANEL_TYPES.EMPTY_WIDGET]: initialQueriesMap.metrics,
 };
 

frontend/src/constants/queryBuilderOperators.ts

@@ -527,6 +527,21 @@ export const metricsHistogramSpaceAggregateOperatorOptions: SelectOption<
 	},
 ];
 
+/**
+ * A heatmap's Y axis is the `le` labels themselves, so every percentile draws the grid a
+ * count already draws. Sum is also what the statement builder forces on a histogram
+ * heatmap whatever is asked for, so it is the only honest option to offer.
+ */
+export const metricsHeatmapHistogramSpaceAggregateOperatorOptions: SelectOption<
+	string,
+	string
+>[] = [
+	{
+		value: MetricAggregateOperator.SUM,
+		label: 'Sum',
+	},
+];
+
 export const metricsEmptyTimeAggregateOperatorOptions: SelectOption<
 	string,
 	string

frontend/src/container/LLMObservability/Explorer/QuerySection/QuerySection.tsx

@@ -1,35 +1,23 @@
 import { memo, useMemo } from 'react';
 import { QueryBuilderV2 } from 'components/QueryBuilderV2/QueryBuilderV2';
 import { PANEL_TYPES } from 'constants/queryBuilder';
-import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import { useGetPanelTypesQueryParam } from 'hooks/queryBuilder/useGetPanelTypesQueryParam';
 import { DataSource } from 'types/common/queryBuilder';
 
 function QuerySection(): JSX.Element {
 	const panelTypes = useGetPanelTypesQueryParam(PANEL_TYPES.LIST);
 
-	// Only reaches the builder for timeseries/table; list/trace panels use QueryBuilderV2's listViewTracesFilterConfigs.
-	const filterConfigs: QueryBuilderProps['filterConfigs'] = useMemo(
-		() => ({
-			stepInterval: { isHidden: false, isDisabled: false },
-			limit: { isHidden: false, isDisabled: true },
-			having: { isHidden: false, isDisabled: true },
-		}),
-		[],
-	);
-
-	const isListViewPanel = useMemo(
+	const isRawQuery = useMemo(
 		() => panelTypes === PANEL_TYPES.LIST || panelTypes === PANEL_TYPES.TRACE,
 		[panelTypes],
 	);
 
 	return (
 		<QueryBuilderV2
-			isListViewPanel={isListViewPanel}
+			isRawQuery={isRawQuery}
 			config={{ initialDataSource: DataSource.TRACES, queryVariant: 'static' }}
 			panelType={panelTypes}
-			filterConfigs={filterConfigs}
-			showOnlyWhereClause={isListViewPanel}
+			showOnlyWhereClause={isRawQuery}
 			version="v3" // setting this to v3 as we this is rendered in logs explorer
 		/>
 	);

frontend/src/container/LogExplorerQuerySection/index.tsx

@@ -1,13 +1,6 @@
-import { memo, useCallback, useMemo } from 'react';
+import { memo, useMemo } from 'react';
 import { QueryBuilderV2 } from 'components/QueryBuilderV2/QueryBuilderV2';
-import {
-	initialQueriesMap,
-	OPERATORS,
-	PANEL_TYPES,
-} from 'constants/queryBuilder';
-import ExplorerOrderBy from 'container/ExplorerOrderBy';
-import { OrderByFilterProps } from 'container/QueryBuilder/filters/OrderByFilter/OrderByFilter.interfaces';
-import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
+import { initialQueriesMap, PANEL_TYPES } from 'constants/queryBuilder';
 import { useGetPanelTypesQueryParam } from 'hooks/queryBuilder/useGetPanelTypesQueryParam';
 import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
 import { useShareBuilderUrl } from 'hooks/queryBuilder/useShareBuilderUrl';
@@ -36,42 +29,11 @@ function LogExplorerQuerySection({
 
 	useShareBuilderUrl({ defaultValue });
 
-	const filterConfigs: QueryBuilderProps['filterConfigs'] = useMemo(() => {
-		const isTable = panelTypes === PANEL_TYPES.TABLE;
-		const isList = panelTypes === PANEL_TYPES.LIST;
-		const config: QueryBuilderProps['filterConfigs'] = {
-			stepInterval: { isHidden: isTable, isDisabled: false },
-			having: { isHidden: isList, isDisabled: true },
-			filters: {
-				customKey: 'body',
-				customOp: OPERATORS.CONTAINS,
-			},
-		};
-
-		return config;
-	}, [panelTypes]);
-
-	const renderOrderBy = useCallback(
-		({ query, onChange }: OrderByFilterProps): JSX.Element => (
-			<ExplorerOrderBy query={query} onChange={onChange} />
-		),
-		[],
-	);
-
-	const queryComponents = useMemo(
-		(): QueryBuilderProps['queryComponents'] => ({
-			...(panelTypes === PANEL_TYPES.LIST ? { renderOrderBy } : {}),
-		}),
-		[panelTypes, renderOrderBy],
-	);
-
 	return (
 		<QueryBuilderV2
-			isListViewPanel={panelTypes === PANEL_TYPES.LIST}
+			isRawQuery={panelTypes === PANEL_TYPES.LIST}
 			config={{ initialDataSource: DataSource.LOGS, queryVariant: 'static' }}
 			panelType={panelTypes}
-			filterConfigs={filterConfigs}
-			queryComponents={queryComponents}
 			showOnlyWhereClause={selectedView === ExplorerViews.LIST}
 			version="v3" // setting this to v3 as we this is rendered in logs explorer
 		/>

frontend/src/container/MeterExplorer/Explorer/Explorer.tsx

@@ -11,7 +11,6 @@ import { initialQueryMeterWithType, PANEL_TYPES } from 'constants/queryBuilder';
 import { REACT_QUERY_KEY } from 'constants/reactQueryKeys';
 import ExplorerOptionWrapper from 'container/ExplorerOptions/ExplorerOptionWrapper';
 import RightToolbarActions from 'container/QueryBuilder/components/ToolbarActions/RightToolbarActions';
-import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import DateTimeSelector from 'container/TopNav/DateTimeSelectionV2';
 import { ExportDashboard } from 'hooks/dashboard/useExportDashboards';
 import { useGetExportToDashboardLink } from 'hooks/dashboard/useGetExportToDashboardLink';
@@ -118,11 +117,6 @@ function Explorer(): JSX.Element {
 		});
 	}, []);
 
-	const queryComponents = useMemo(
-		(): QueryBuilderProps['queryComponents'] => ({}),
-		[],
-	);
-
 	return (
 		<Sentry.ErrorBoundary fallback={<ErrorBoundaryFallback />}>
 			<div
@@ -178,7 +172,6 @@ function Explorer(): JSX.Element {
 								signalSource: 'meter',
 							}}
 							panelType={PANEL_TYPES.TIME_SERIES}
-							queryComponents={queryComponents}
 							showFunctions={false}
 							version="v3"
 						/>

frontend/src/container/MetricsExplorer/Explorer/Explorer.tsx

@@ -12,7 +12,6 @@ import { REACT_QUERY_KEY } from 'constants/reactQueryKeys';
 import { usePageActions } from 'container/AIAssistant/pageActions/usePageActions';
 import ExplorerOptionWrapper from 'container/ExplorerOptions/ExplorerOptionWrapper';
 import RightToolbarActions from 'container/QueryBuilder/components/ToolbarActions/RightToolbarActions';
-import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import DateTimeSelector from 'container/TopNav/DateTimeSelectionV2';
 import { ExportDashboard } from 'hooks/dashboard/useExportDashboards';
 import { useGetExportToDashboardLink } from 'hooks/dashboard/useGetExportToDashboardLink';
@@ -323,11 +322,6 @@ function Explorer(): JSX.Element {
 		});
 	}, []);
 
-	const queryComponents = useMemo(
-		(): QueryBuilderProps['queryComponents'] => ({}),
-		[],
-	);
-
 	const [warning, setWarning] = useState<Warning | undefined>();
 
 	const oneChartPerQueryDisabledTooltip = useMemo(() => {
@@ -381,7 +375,6 @@ function Explorer(): JSX.Element {
 				<QueryBuilderV2
 					config={{ initialDataSource: DataSource.METRICS, queryVariant: 'static' }}
 					panelType={PANEL_TYPES.TIME_SERIES}
-					queryComponents={queryComponents}
 					showFunctions={false}
 					version="v3"
 				/>

frontend/src/container/QueryBuilder/QueryBuilder.interfaces.ts

@@ -1,22 +1,9 @@
 import { ReactNode } from 'react';
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import { QueryBuilderFieldsConfig } from 'components/QueryBuilderV2/queryBuilderFields.types';
 import { PANEL_TYPES } from 'constants/queryBuilder';
-import { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
 import { DataSource } from 'types/common/queryBuilder';
 
-import { OrderByFilterProps } from './filters/OrderByFilter/OrderByFilter.interfaces';
-
-export type WhereClauseConfig = {
-	customKey: string;
-	customOp: string;
-};
-
-type FilterConfigs = {
-	[Key in keyof Omit<IBuilderQuery, 'filters'>]: {
-		isHidden: boolean;
-		isDisabled: boolean;
-	};
-} & { filters: WhereClauseConfig };
-
 export type QueryBuilderConfig =
 	| {
 			queryVariant: 'static';
@@ -29,9 +16,16 @@ export type QueryBuilderProps = {
 	config?: QueryBuilderConfig;
 	panelType: PANEL_TYPES;
 	actions?: ReactNode;
-	filterConfigs?: Partial<FilterConfigs>;
-	queryComponents?: { renderOrderBy?: (props: OrderByFilterProps) => ReactNode };
-	isListViewPanel?: boolean;
+	fieldsConfig?: QueryBuilderFieldsConfig;
+	/**
+	 * The builder edits raw rows rather than an aggregation: a single query unless trace
+	 * matching is on, no formulas, data-source switches reset to the raw-query template,
+	 * and order by resolves keys without an aggregate attribute. Supplies the defaults for
+	 * `fieldsConfig` and `allowedDataSources`, which override it per field.
+	 */
+	isRawQuery?: boolean;
+	/** Defaults to every signal. */
+	allowedDataSources?: TelemetrytypesSignalDTO[];
 	showFunctions?: boolean;
 	showOnlyWhereClause?: boolean;
 	showOnlyTraceOperator?: boolean;

frontend/src/container/QueryBuilder/components/AdditionalFiltersToggler/AdditionalFiltersToggler.interfaces.ts

@@ -1,6 +0,0 @@
-import { ReactNode } from 'react';
-
-export type AdditionalFiltersProps = {
-	listOfAdditionalFilter: string[];
-	children: ReactNode;
-};

frontend/src/container/QueryBuilder/components/AdditionalFiltersToggler/AdditionalFiltersToggler.styled.ts

@@ -1,38 +0,0 @@
-import { SquareMinus, SquarePlus } from '@signozhq/icons';
-import { Color } from '@signozhq/design-tokens';
-import { Col } from 'antd';
-import { Typography } from '@signozhq/ui/typography';
-import styled, { css } from 'styled-components';
-
-const IconCss = css`
-	margin-right: 0.6875rem;
-	transition: all 0.2s ease;
-`;
-
-export const StyledIconOpen = styled(SquarePlus)`
-	${IconCss}
-`;
-
-export const StyledIconClose = styled(SquareMinus)`
-	${IconCss}
-`;
-
-export const StyledInner = styled(Col)`
-	width: fit-content;
-	display: flex;
-	align-items: center;
-	gap: 8px;
-	margin-bottom: 0.875rem;
-	min-height: 1.375rem;
-	cursor: pointer;
-	&:hover {
-		${StyledIconOpen}, ${StyledIconClose} {
-			opacity: 0.7;
-		}
-	}
-`;
-
-export const StyledLink = styled(Typography.Link)`
-	pointer-events: none;
-	color: ${Color.BG_ROBIN_400} !important;
-`;

frontend/src/container/QueryBuilder/components/AdditionalFiltersToggler/AdditionalFiltersToggler.styles.scss

@@ -1,15 +0,0 @@
-.filter-toggler {
-	margin-right: 8px;
-}
-
-.additinal-filters-container {
-	.action-btn {
-		background: var(--primary-background);
-		width: 16px;
-		height: 16px;
-		border-radius: 3px;
-		display: flex;
-		justify-content: center;
-		align-items: center;
-	}
-}

frontend/src/container/QueryBuilder/components/AdditionalFiltersToggler/AdditionalFiltersToggler.tsx

@@ -1,66 +0,0 @@
-import { Fragment, memo, ReactNode, useState } from 'react';
-import { Color } from '@signozhq/design-tokens';
-import { Col, Row } from 'antd';
-import { Typography } from '@signozhq/ui/typography';
-import { Minus, Plus } from '@signozhq/icons';
-
-// ** Types
-import { AdditionalFiltersProps } from './AdditionalFiltersToggler.interfaces';
-// ** Styles
-import { StyledInner, StyledLink } from './AdditionalFiltersToggler.styled';
-
-import './AdditionalFiltersToggler.styles.scss';
-
-export const AdditionalFiltersToggler = memo(function AdditionalFiltersToggler({
-	children,
-	listOfAdditionalFilter,
-}: AdditionalFiltersProps): JSX.Element {
-	const [isOpenedFilters, setIsOpenedFilters] = useState<boolean>(false);
-
-	const handleToggleOpenFilters = (): void => {
-		setIsOpenedFilters((prevState) => !prevState);
-	};
-
-	const filtersTexts: ReactNode = listOfAdditionalFilter?.map((str, index) => {
-		const isNextLast = index + 1 === listOfAdditionalFilter.length - 1;
-
-		if (index === listOfAdditionalFilter.length - 1) {
-			return (
-				<Fragment key={str}>
-					{listOfAdditionalFilter?.length > 1 && 'and'}{' '}
-					<StyledLink>{str.toUpperCase()}</StyledLink>
-				</Fragment>
-			);
-		}
-
-		return (
-			<span key={str}>
-				<StyledLink>{str.toUpperCase()}</StyledLink>
-				{isNextLast ? ' ' : ', '}
-			</span>
-		);
-	});
-
-	return (
-		<Row className="additinal-filters-container">
-			<Col span={24}>
-				<StyledInner onClick={handleToggleOpenFilters} style={{ marginBottom: 0 }}>
-					{isOpenedFilters ? (
-						<span className="action-btn">
-							<Minus size={14} color={Color.BG_INK_500} />
-						</span>
-					) : (
-						<span className="action-btn">
-							<Plus size={14} color={Color.BG_INK_500} />
-						</span>
-					)}
-
-					{!isOpenedFilters && (
-						<Typography>Add conditions for {filtersTexts}</Typography>
-					)}
-				</StyledInner>
-			</Col>
-			{isOpenedFilters && <Col span={24}>{children}</Col>}
-		</Row>
-	);
-});

frontend/src/container/QueryBuilder/components/AdditionalFiltersToggler/index.ts

@@ -1 +0,0 @@
-export { AdditionalFiltersToggler } from './AdditionalFiltersToggler';

frontend/src/container/QueryBuilder/components/DataSourceDropdown/DataSourceDropdown.interfaces.ts

@@ -1,8 +1,10 @@
 import { SelectProps } from 'antd';
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
 import { DataSource } from 'types/common/queryBuilder';
 
 export type QueryLabelProps = {
 	onChange: (value: DataSource) => void;
-	isListViewPanel?: boolean;
+	/** Defaults to every signal. */
+	allowedDataSources?: TelemetrytypesSignalDTO[];
 	'data-testid'?: string;
 } & Omit<SelectProps, 'onChange'>;

frontend/src/container/QueryBuilder/components/DataSourceDropdown/DataSourceDropdown.tsx

@@ -1,5 +1,6 @@
 import { memo } from 'react';
 import { Select } from 'antd';
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
 import { DataSource } from 'types/common/queryBuilder';
 import { SelectOption } from 'types/common/select';
 // ** Helpers
@@ -7,25 +8,24 @@ import { transformToUpperCase } from 'utils/transformToUpperCase';
 
 // ** Types
 import { QueryLabelProps } from './DataSourceDropdown.interfaces';
+import { signalsToDataSources } from './DataSourceDropdown.utils';
 
-const dataSourceMap = [DataSource.LOGS, DataSource.METRICS, DataSource.TRACES];
-
-const exploreDataSourceMap = [DataSource.LOGS, DataSource.TRACES];
+const ALL_SIGNALS = [
+	TelemetrytypesSignalDTO.logs,
+	TelemetrytypesSignalDTO.metrics,
+	TelemetrytypesSignalDTO.traces,
+];
 
 export const DataSourceDropdown = memo(function DataSourceDropdown(
 	props: QueryLabelProps,
 ): JSX.Element {
-	const { onChange, value, style, isListViewPanel = false } = props;
+	const { onChange, value, style, allowedDataSources = ALL_SIGNALS } = props;
 
-	const dataSourceOptions: SelectOption<DataSource, string>[] = isListViewPanel
-		? exploreDataSourceMap.map((source) => ({
-				label: transformToUpperCase(source),
-				value: source,
-			}))
-		: dataSourceMap.map((source) => ({
-				label: transformToUpperCase(source),
-				value: source,
-			}));
+	const dataSourceOptions: SelectOption<DataSource, string>[] =
+		signalsToDataSources(allowedDataSources).map((source) => ({
+			label: transformToUpperCase(source),
+			value: source,
+		}));
 
 	return (
 		<Select

frontend/src/container/QueryBuilder/components/DataSourceDropdown/DataSourceDropdown.utils.ts

@@ -0,0 +1,20 @@
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import { DataSource } from 'types/common/queryBuilder';
+
+// Partial because the signal enum also carries an empty "unset" member, which is not a
+// data source a query can be built against.
+const SIGNAL_TO_DATA_SOURCE: Partial<
+	Record<TelemetrytypesSignalDTO, DataSource>
+> = {
+	[TelemetrytypesSignalDTO.logs]: DataSource.LOGS,
+	[TelemetrytypesSignalDTO.metrics]: DataSource.METRICS,
+	[TelemetrytypesSignalDTO.traces]: DataSource.TRACES,
+};
+
+export function signalsToDataSources(
+	signals: readonly TelemetrytypesSignalDTO[],
+): DataSource[] {
+	return signals
+		.map((signal) => SIGNAL_TO_DATA_SOURCE[signal])
+		.filter((dataSource): dataSource is DataSource => Boolean(dataSource));
+}

frontend/src/container/QueryBuilder/components/DataSourceDropdown/__tests__/DataSourceDropdown.test.tsx

@@ -0,0 +1,79 @@
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
+import { render, screen, userEvent } from 'tests/test-utils';
+import { DataSource } from 'types/common/queryBuilder';
+
+import { DataSourceDropdown } from '../DataSourceDropdown';
+
+const TEST_ID = 'query-data-source-selector';
+
+async function openDropdown(): Promise<void> {
+	const user = userEvent.setup();
+	const trigger = screen.getByTestId(TEST_ID);
+	await user.click(trigger.querySelector('.ant-select-selector') as HTMLElement);
+}
+
+describe('DataSourceDropdown', () => {
+	// antd's virtual list renders only the first couple of options into jsdom, so
+	// each case asserts what the restriction admits and excludes, not the full list.
+	it('offers the signals beyond the current one when nothing restricts it', async () => {
+		render(
+			<DataSourceDropdown
+				data-testid={TEST_ID}
+				value={DataSource.METRICS}
+				onChange={jest.fn()}
+			/>,
+		);
+		await openDropdown();
+
+		await expect(
+			screen.findByRole('option', { name: 'Logs' }),
+		).resolves.toBeInTheDocument();
+		expect(screen.getByRole('option', { name: 'Metrics' })).toBeInTheDocument();
+	});
+
+	it('offers only the signals the caller can visualize', async () => {
+		render(
+			<DataSourceDropdown
+				data-testid={TEST_ID}
+				value={DataSource.METRICS}
+				allowedDataSources={[TelemetrytypesSignalDTO.metrics]}
+				onChange={jest.fn()}
+			/>,
+		);
+		await openDropdown();
+
+		await expect(
+			screen.findByRole('option', { name: 'Metrics' }),
+		).resolves.toBeInTheDocument();
+		expect(
+			screen.queryByRole('option', { name: 'Logs' }),
+		).not.toBeInTheDocument();
+		expect(
+			screen.queryByRole('option', { name: 'Traces' }),
+		).not.toBeInTheDocument();
+	});
+
+	it('drops a signal that is not a data source a query can be built against', async () => {
+		render(
+			<DataSourceDropdown
+				data-testid={TEST_ID}
+				value={DataSource.LOGS}
+				allowedDataSources={[
+					TelemetrytypesSignalDTO.logs,
+					TelemetrytypesSignalDTO.traces,
+					TelemetrytypesSignalDTO[''],
+				]}
+				onChange={jest.fn()}
+			/>,
+		);
+		await openDropdown();
+
+		await expect(
+			screen.findByRole('option', { name: 'Logs' }),
+		).resolves.toBeInTheDocument();
+		expect(screen.getByRole('option', { name: 'Traces' })).toBeInTheDocument();
+		expect(
+			screen.queryByRole('option', { name: 'Metrics' }),
+		).not.toBeInTheDocument();
+	});
+});

frontend/src/container/QueryBuilder/components/FilterLabel/FilterLabel.interfaces.ts

@@ -1,6 +0,0 @@
-import { CSSProperties } from 'react';
-
-export type FilterLabelProps = {
-	label: string;
-	style?: CSSProperties;
-};

frontend/src/container/QueryBuilder/components/FilterLabel/FilterLabel.styled.ts

@@ -1,16 +0,0 @@
-import styled from 'styled-components';
-
-interface Props {
-	isDarkMode: boolean;
-	children?: React.ReactNode;
-}
-
-export const StyledLabel = styled.div<Props>`
-	padding: 0 0.6875rem;
-	min-height: 2rem;
-	min-width: 5.625rem;
-	display: inline-flex;
-	white-space: nowrap;
-	align-items: center;
-	border-radius: 0.125rem;
-`;

frontend/src/container/QueryBuilder/components/FilterLabel/FilterLabel.tsx

@@ -1,26 +0,0 @@
-import { memo } from 'react';
-import { Typography } from '@signozhq/ui/typography';
-import { useIsDarkMode } from 'hooks/useDarkMode';
-
-// ** Types
-import { FilterLabelProps } from './FilterLabel.interfaces';
-// ** Styles
-import { StyledLabel } from './FilterLabel.styled';
-
-export const FilterLabel = memo(function FilterLabel({
-	label,
-}: FilterLabelProps): JSX.Element {
-	const isDarkMode = useIsDarkMode();
-
-	return (
-		<StyledLabel isDarkMode={isDarkMode}>
-			<Typography
-				style={{
-					color: 'var(--bg-vanilla-400)',
-				}}
-			>
-				{label}
-			</Typography>
-		</StyledLabel>
-	);
-});

frontend/src/container/QueryBuilder/components/FilterLabel/index.ts

@@ -1 +0,0 @@
-export { FilterLabel } from './FilterLabel';

frontend/src/container/QueryBuilder/components/Formula/Formula.interfaces.ts

@@ -1,4 +1,3 @@
-import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import {
 	IBuilderFormula,
 	IBuilderQuery,
@@ -8,7 +7,5 @@ export type FormulaProps = {
 	formula: IBuilderFormula;
 	index: number;
 	query: IBuilderQuery;
-	filterConfigs: Partial<QueryBuilderProps['filterConfigs']>;
-	isAdditionalFilterEnable: boolean;
 	isQBV2?: boolean;
 };

frontend/src/container/QueryBuilder/components/Formula/Formula.tsx

@@ -2,11 +2,6 @@ import { ChangeEvent, useCallback, useMemo, useState } from 'react';
 import { Col, Input, Row, Select } from 'antd';
 import InputWithLabel from 'components/InputWithLabel/InputWithLabel';
 import { LEGEND } from 'constants/global';
-// ** Components
-import { FilterLabel } from 'container/QueryBuilder/components';
-import HavingFilter from 'container/QueryBuilder/filters/Formula/Having/HavingFilter';
-import LimitFilter from 'container/QueryBuilder/filters/Formula/Limit/Limit';
-import OrderByFilter from 'container/QueryBuilder/filters/Formula/OrderBy/OrderByFilter';
 // ** Hooks
 import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
 import { useQueryOperations } from 'hooks/queryBuilder/useQueryBuilderOperations';
@@ -17,7 +12,6 @@ import {
 import { getFormatedLegend } from 'utils/getFormatedLegend';
 import { popupContainer } from 'utils/selectPopupContainer';
 
-import { AdditionalFiltersToggler } from '../AdditionalFiltersToggler';
 import QBEntityOptions from '../QBEntityOptions/QBEntityOptions';
 // ** Types
 import { FormulaProps } from './Formula.interfaces';
@@ -27,22 +21,18 @@ import './Formula.styles.scss';
 export function Formula({
 	index,
 	formula,
-	filterConfigs,
 	query,
-	isAdditionalFilterEnable,
 	isQBV2,
 }: FormulaProps): JSX.Element {
 	const { removeQueryBuilderEntityByIndex, handleSetFormulaData } =
 		useQueryBuilder();
 
-	const { listOfAdditionalFormulaFilters, handleChangeFormulaData } =
-		useQueryOperations({
-			index,
-			query,
-			filterConfigs,
-			formula,
-			entityVersion: '',
-		});
+	const { handleChangeFormulaData } = useQueryOperations({
+		index,
+		query,
+		formula,
+		entityVersion: '',
+	});
 
 	const [isCollapse, setIsCollapsed] = useState(false);
 
@@ -83,20 +73,6 @@ export function Formula({
 		[handleChangeFormulaData],
 	);
 
-	const handleChangeHavingFilter = useCallback(
-		(value: IBuilderFormula['having']) => {
-			handleChangeFormulaData('having', value);
-		},
-		[handleChangeFormulaData],
-	);
-
-	const handleChangeOrderByFilter = useCallback(
-		(value: IBuilderFormula['orderBy']) => {
-			handleChangeFormulaData('orderBy', value);
-		},
-		[handleChangeFormulaData],
-	);
-
 	const handleQBV2OrderByChange = useCallback(
 		(value: string) => {
 			const [columnName, order] = value.split(' ');
@@ -122,54 +98,6 @@ export function Formula({
 		[formula.orderBy],
 	);
 
-	const renderAdditionalFilters = useMemo(
-		() => (
-			<>
-				<Col span={11}>
-					<Row gutter={[11, 5]}>
-						<Col flex="5.93rem">
-							<FilterLabel label="Limit" />
-						</Col>
-						<Col flex="1 1 12.5rem">
-							<LimitFilter formula={formula} onChange={handleChangeLimit} />
-						</Col>
-					</Row>
-				</Col>
-				<Col span={11}>
-					<Row gutter={[11, 5]}>
-						<Col flex="5.93rem">
-							<FilterLabel label="HAVING" />
-						</Col>
-						<Col flex="1 1 12.5rem">
-							<HavingFilter formula={formula} onChange={handleChangeHavingFilter} />
-						</Col>
-					</Row>
-				</Col>
-				<Col span={11}>
-					<Row gutter={[11, 5]}>
-						<Col flex="5.93rem">
-							<FilterLabel label="Order by" />
-						</Col>
-						<Col flex="1 1 12.5rem">
-							<OrderByFilter
-								query={query}
-								formula={formula}
-								onChange={handleChangeOrderByFilter}
-							/>
-						</Col>
-					</Row>
-				</Col>
-			</>
-		),
-		[
-			formula,
-			handleChangeHavingFilter,
-			handleChangeLimit,
-			handleChangeOrderByFilter,
-			query,
-		],
-	);
-
 	return (
 		<Row gutter={[0, 15]}>
 			<QBEntityOptions
@@ -206,17 +134,6 @@ export function Formula({
 							addonBefore="Legend Format"
 						/>
 					</Col>
-					{isAdditionalFilterEnable && (
-						<Col span={24}>
-							<AdditionalFiltersToggler
-								listOfAdditionalFilter={listOfAdditionalFormulaFilters}
-							>
-								<Row gutter={[0, 11]} justify="space-between">
-									{renderAdditionalFilters}
-								</Row>
-							</AdditionalFiltersToggler>
-						</Col>
-					)}
 					{isQBV2 && (
 						<Col span={24}>
 							<div className="formula-qbv2-container">

frontend/src/container/QueryBuilder/components/QBEntityOptions/QBEntityOptions.styles.scss

@@ -84,5 +84,14 @@
 		.options-group {
 			max-width: 100%;
 		}
+
+		.query-functions-container--disabled {
+			opacity: 0.45;
+			cursor: not-allowed;
+
+			> * {
+				pointer-events: none;
+			}
+		}
 	}
 }

frontend/src/container/QueryBuilder/components/QBEntityOptions/QBEntityOptions.tsx

@@ -1,5 +1,6 @@
 import { useLocation } from 'react-router-dom';
 import { Button, Col, Tooltip } from 'antd';
+import { TelemetrytypesSignalDTO } from 'api/generated/services/sigNoz.schemas';
 import cx from 'classnames';
 import ROUTES from 'constants/routes';
 import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
@@ -26,6 +27,8 @@ interface QBEntityOptionsProps {
 	query?: IBuilderQuery;
 	isMetricsDataSource?: boolean;
 	showFunctions?: boolean;
+	functionsDisabled?: boolean;
+	functionsDisabledReason?: string;
 	isCollapsed: boolean;
 	entityType: string;
 	entityData: any;
@@ -36,7 +39,8 @@ interface QBEntityOptionsProps {
 	onQueryFunctionsUpdates?: (functions: QueryFunction[]) => void;
 	showDeleteButton?: boolean;
 	showCloneOption?: boolean;
-	isListViewPanel?: boolean;
+	isRawQuery?: boolean;
+	allowedDataSources?: TelemetrytypesSignalDTO[];
 	index?: number;
 	showTraceOperator?: boolean;
 	hasTraceOperator?: boolean;
@@ -50,12 +54,15 @@ export default function QBEntityOptions({
 	isMetricsDataSource,
 	isCollapsed,
 	showFunctions,
+	functionsDisabled,
+	functionsDisabledReason,
 	entityType,
 	entityData,
 	onToggleVisibility,
 	onCollapseEntity,
 	onQueryFunctionsUpdates,
-	isListViewPanel,
+	isRawQuery,
+	allowedDataSources,
 	onDelete,
 	showDeleteButton,
 	showCloneOption,
@@ -100,7 +107,7 @@ export default function QBEntityOptions({
 									value="query-builder"
 									className="periscope-btn visibility-toggle"
 									onClick={onToggleVisibility}
-									disabled={isListViewPanel && !showTraceOperator}
+									disabled={isRawQuery && !showTraceOperator}
 								>
 									{entityData.disabled ? <EyeOff size={16} /> : <Eye size={16} />}
 								</Button>
@@ -119,7 +126,7 @@ export default function QBEntityOptions({
 									'periscope-btn',
 									entityType === 'query' ? 'query-name' : 'formula-name',
 									query?.dataSource === DataSource.TRACES &&
-										(hasTraceOperator || (showTraceOperator && isListViewPanel))
+										(hasTraceOperator || (showTraceOperator && isRawQuery))
 										? 'has-trace-operator'
 										: '',
 									isLogsExplorerPage && lastUsedQuery === index ? 'sync-btn' : '',
@@ -138,24 +145,33 @@ export default function QBEntityOptions({
 										}}
 										data-testid={`query-data-source-selector-${index}`}
 										value={query?.dataSource || DataSource.METRICS}
-										isListViewPanel={isListViewPanel}
+										allowedDataSources={allowedDataSources}
 										className="query-data-source-dropdown"
 									/>
 								</div>
 							)}
 
 							{showFunctions &&
-								!isListViewPanel &&
+								!isRawQuery &&
 								(isMetricsDataSource || isLogsDataSource) &&
 								query &&
 								onQueryFunctionsUpdates && (
-									<QueryFunctions
-										query={query}
-										queryFunctions={query.functions || []}
-										key={query.functions?.toString()}
-										onChange={onQueryFunctionsUpdates}
-										maxFunctions={isLogsDataSource ? 1 : 3}
-									/>
+									<Tooltip title={functionsDisabledReason}>
+										<div
+											className={cx('query-functions-container', {
+												'query-functions-container--disabled': functionsDisabled,
+											})}
+											aria-disabled={functionsDisabled}
+										>
+											<QueryFunctions
+												query={query}
+												queryFunctions={query.functions || []}
+												key={query.functions?.toString()}
+												onChange={onQueryFunctionsUpdates}
+												maxFunctions={isLogsDataSource ? 1 : 3}
+											/>
+										</div>
+									</Tooltip>
 								)}
 						</Button.Group>
 					</div>
@@ -168,7 +184,7 @@ export default function QBEntityOptions({
 					)}
 				</div>
 
-				{showDeleteButton && !isListViewPanel && (
+				{showDeleteButton && !isRawQuery && (
 					<Button className="periscope-btn ghost" onClick={onDelete}>
 						<Trash2 size={14} />
 					</Button>
@@ -179,11 +195,14 @@ export default function QBEntityOptions({
 }
 
 QBEntityOptions.defaultProps = {
-	isListViewPanel: false,
+	isRawQuery: false,
+	allowedDataSources: undefined,
 	query: undefined,
 	isMetricsDataSource: false,
 	onQueryFunctionsUpdates: undefined,
 	showFunctions: false,
+	functionsDisabled: false,
+	functionsDisabledReason: undefined,
 	onCloneQuery: noop,
 	index: 0,
 	onDelete: noop,

frontend/src/container/QueryBuilder/components/index.ts

@@ -1,6 +1,4 @@
-export { AdditionalFiltersToggler } from './AdditionalFiltersToggler';
 export { DataSourceDropdown } from './DataSourceDropdown';
-export { FilterLabel } from './FilterLabel';
 export { Formula } from './Formula';
 export { HavingFilterTag } from './HavingFilterTag';
 export { ListItemWrapper } from './ListItemWrapper';

frontend/src/container/QueryBuilder/filters/Formula/Having/HavingFilter.tsx

@@ -1,198 +0,0 @@
-import { useCallback, useEffect, useMemo, useState } from 'react';
-import { Select } from 'antd';
-import { HAVING_OPERATORS, initialHavingValues } from 'constants/queryBuilder';
-import { HavingFilterTag } from 'container/QueryBuilder/components';
-import { useTagValidation } from 'hooks/queryBuilder/useTagValidation';
-import {
-	transformFromStringToHaving,
-	transformHavingToStringValue,
-} from 'lib/query/transformQueryBuilderData';
-import { Having, HavingForm } from 'types/api/queryBuilder/queryBuilderData';
-import { SelectOption } from 'types/common/select';
-import { useSelectPopupContainer } from 'utils/selectPopupContainer';
-
-import { getHavingObject, isValidHavingValue } from '../../utils';
-import { HavingFilterProps, HavingTagRenderProps } from './types';
-
-function HavingFilter({ formula, onChange }: HavingFilterProps): JSX.Element {
-	const getPopupContainer = useSelectPopupContainer();
-	const { having } = formula;
-	const [searchText, setSearchText] = useState<string>('');
-	const [localValues, setLocalValues] = useState<string[]>([]);
-	const [currentFormValue, setCurrentFormValue] =
-		useState<HavingForm>(initialHavingValues);
-	const [options, setOptions] = useState<SelectOption<string, string>[]>([]);
-
-	const { isMulti } = useTagValidation(
-		currentFormValue.op,
-		currentFormValue.value,
-	);
-
-	const columnName = formula.expression.replace(/ /g, '').toUpperCase();
-
-	const aggregatorOptions: SelectOption<string, string>[] = useMemo(
-		() => [{ label: columnName, value: columnName }],
-		[columnName],
-	);
-
-	const handleUpdateTag = useCallback(
-		(value: string) => {
-			const filteredValues = localValues.filter(
-				(currentValue) => currentValue !== value,
-			);
-			const having: Having[] = filteredValues.map(transformFromStringToHaving);
-
-			onChange(having);
-			setSearchText(value);
-		},
-		[localValues, onChange],
-	);
-
-	const generateOptions = useCallback(
-		(currentString: string) => {
-			const [aggregator = '', op = '', ...restValue] = currentString.split(' ');
-			let newOptions: SelectOption<string, string>[] = [];
-
-			const isAggregatorExist = columnName
-				.toLowerCase()
-				.includes(currentString.toLowerCase());
-
-			const isAggregatorChosen = aggregator === columnName;
-
-			if (isAggregatorExist || aggregator === '') {
-				newOptions = aggregatorOptions;
-			}
-
-			if ((isAggregatorChosen && op === '') || op) {
-				const filteredOperators = HAVING_OPERATORS.filter((num) =>
-					num.toLowerCase().includes(op.toLowerCase()),
-				);
-
-				newOptions = filteredOperators.map((opt) => ({
-					label: `${columnName} ${opt} ${restValue && restValue.join(' ')}`,
-					value: `${columnName} ${opt} ${restValue && restValue.join(' ')}`,
-				}));
-			}
-
-			setOptions(newOptions);
-		},
-		[aggregatorOptions, columnName],
-	);
-
-	const parseSearchText = useCallback(
-		(text: string) => {
-			const { columnName, op, value } = getHavingObject(text);
-			setCurrentFormValue({ columnName, op, value });
-
-			generateOptions(text);
-		},
-		[generateOptions],
-	);
-
-	const tagRender = ({
-		label,
-		value,
-		closable,
-		disabled,
-		onClose,
-	}: HavingTagRenderProps): JSX.Element => {
-		const handleClose = (): void => {
-			onClose();
-			setSearchText('');
-		};
-		return (
-			<HavingFilterTag
-				label={label}
-				value={value}
-				closable={closable}
-				disabled={disabled}
-				onClose={handleClose}
-				onUpdate={handleUpdateTag}
-			/>
-		);
-	};
-
-	const handleSearch = (search: string): void => {
-		const trimmedSearch = search.replace(/\s\s+/g, ' ').trimStart();
-
-		const currentSearch = isMulti
-			? trimmedSearch
-			: trimmedSearch.split(' ').slice(0, 3).join(' ');
-
-		const isValidSearch = isValidHavingValue(currentSearch);
-
-		if (isValidSearch) {
-			setSearchText(currentSearch);
-		}
-	};
-
-	useEffect(() => {
-		setLocalValues(transformHavingToStringValue(having || []));
-	}, [having]);
-
-	useEffect(() => {
-		parseSearchText(searchText);
-	}, [searchText, parseSearchText]);
-
-	const resetChanges = (): void => {
-		setSearchText('');
-		setCurrentFormValue(initialHavingValues);
-		setOptions(aggregatorOptions);
-	};
-
-	const handleDeselect = (value: string): void => {
-		const result = localValues.filter((item) => item !== value);
-		const having: Having[] = result.map(transformFromStringToHaving);
-		onChange(having);
-		resetChanges();
-	};
-
-	const handleSelect = (currentValue: string): void => {
-		const { columnName, op, value } = getHavingObject(currentValue);
-
-		const isCompletedValue = value.every((item) => !!item);
-
-		const isClearSearch = isCompletedValue && columnName && op;
-
-		setSearchText(isClearSearch ? '' : currentValue);
-	};
-
-	const handleChange = (values: string[]): void => {
-		const having: Having[] = values.map(transformFromStringToHaving);
-
-		const isSelectable =
-			currentFormValue.value.length > 0 &&
-			currentFormValue.value.every((value) => !!value);
-
-		if (isSelectable) {
-			onChange(having);
-			resetChanges();
-		}
-	};
-
-	return (
-		<Select
-			getPopupContainer={getPopupContainer}
-			autoClearSearchValue={false}
-			mode="multiple"
-			onSearch={handleSearch}
-			searchValue={searchText}
-			data-testid="havingSelectFormula"
-			placeholder="Count(operation) > 5"
-			style={{ width: '100%' }}
-			tagRender={tagRender}
-			onDeselect={handleDeselect}
-			onSelect={handleSelect}
-			onChange={handleChange}
-			value={localValues}
-		>
-			{options.map((opt) => (
-				<Select.Option key={opt.value} value={opt.value} title="havingOption">
-					{opt.label}
-				</Select.Option>
-			))}
-		</Select>
-	);
-}
-
-export default HavingFilter;

frontend/src/container/QueryBuilder/filters/Formula/Having/types.ts

@@ -1,12 +0,0 @@
-import { HavingFilterTagProps } from 'container/QueryBuilder/components/HavingFilterTag/HavingFilterTag.interfaces';
-import {
-	Having,
-	IBuilderFormula,
-} from 'types/api/queryBuilder/queryBuilderData';
-
-export type HavingFilterProps = {
-	formula: IBuilderFormula;
-	onChange: (having: Having[]) => void;
-};
-
-export type HavingTagRenderProps = Omit<HavingFilterTagProps, 'onUpdate'>;

frontend/src/container/QueryBuilder/filters/Formula/Limit/Limit.tsx

@@ -1,20 +0,0 @@
-import { InputNumber } from 'antd';
-
-import { selectStyle } from '../../QueryBuilderSearchV2/config';
-import { handleKeyDownLimitFilter } from '../../utils';
-import { LimitFilterProps } from './types';
-
-function LimitFilter({ onChange, formula }: LimitFilterProps): JSX.Element {
-	return (
-		<InputNumber
-			min={1}
-			type="number"
-			value={formula.limit}
-			style={selectStyle}
-			onChange={onChange}
-			onKeyDown={handleKeyDownLimitFilter}
-		/>
-	);
-}
-
-export default LimitFilter;

frontend/src/container/QueryBuilder/filters/Formula/Limit/types.ts

@@ -1,6 +0,0 @@
-import { IBuilderFormula } from 'types/api/queryBuilder/queryBuilderData';
-
-export interface LimitFilterProps {
-	onChange: (values: number | null) => void;
-	formula: IBuilderFormula;
-}

frontend/src/container/QueryBuilder/filters/Formula/OrderBy/OrderByFilter.tsx

@@ -1,85 +0,0 @@
-import { useMemo } from 'react';
-import { Select, Spin } from 'antd';
-import { useGetAggregateKeys } from 'hooks/queryBuilder/useGetAggregateKeys';
-import { MetricAggregateOperator } from 'types/common/queryBuilder';
-import { useSelectPopupContainer } from 'utils/selectPopupContainer';
-
-import { selectStyle } from '../../QueryBuilderSearchV2/config';
-import { OrderByProps } from './types';
-import { useOrderByFormulaFilter } from './useOrderByFormulaFilter';
-
-function OrderByFilter({
-	formula,
-	onChange,
-	query,
-}: OrderByProps): JSX.Element {
-	const getPopupContainer = useSelectPopupContainer();
-	const {
-		debouncedSearchText,
-		createOptions,
-		aggregationOptions,
-		handleChange,
-		handleSearchKeys,
-		selectedValue,
-		generateOptions,
-	} = useOrderByFormulaFilter({
-		query,
-		onChange,
-		formula,
-	});
-
-	const { data, isFetching } = useGetAggregateKeys(
-		{
-			aggregateAttribute: query.aggregateAttribute?.key || '',
-			dataSource: query.dataSource,
-			aggregateOperator: query.aggregateOperator || '',
-			searchText: debouncedSearchText,
-		},
-		{
-			enabled: !!query.aggregateAttribute?.key,
-			keepPreviousData: true,
-		},
-	);
-
-	const optionsData = useMemo(() => {
-		const keyOptions = createOptions(data?.payload?.attributeKeys || []);
-		const groupByOptions = createOptions(query.groupBy);
-		const options =
-			query.aggregateOperator === MetricAggregateOperator.NOOP
-				? keyOptions
-				: [...groupByOptions, ...aggregationOptions];
-
-		return generateOptions(options);
-	}, [
-		aggregationOptions,
-		createOptions,
-		data?.payload?.attributeKeys,
-		generateOptions,
-		query.aggregateOperator,
-		query.groupBy,
-	]);
-
-	const isDisabledSelect =
-		!query.aggregateAttribute?.key ||
-		query.aggregateOperator === MetricAggregateOperator.NOOP;
-
-	return (
-		<Select
-			getPopupContainer={getPopupContainer}
-			mode="tags"
-			style={selectStyle}
-			onSearch={handleSearchKeys}
-			showSearch
-			disabled={isDisabledSelect}
-			showArrow={false}
-			value={selectedValue}
-			labelInValue
-			filterOption={false}
-			options={optionsData}
-			notFoundContent={isFetching ? <Spin size="small" /> : null}
-			onChange={handleChange}
-		/>
-	);
-}
-
-export default OrderByFilter;

frontend/src/container/QueryBuilder/filters/Formula/OrderBy/types.ts

@@ -1,12 +0,0 @@
-import {
-	IBuilderFormula,
-	IBuilderQuery,
-} from 'types/api/queryBuilder/queryBuilderData';
-
-export interface OrderByProps {
-	formula: IBuilderFormula;
-	query: IBuilderQuery;
-	onChange: (value: IBuilderFormula['orderBy']) => void;
-}
-
-export type IOrderByFormulaFilterProps = OrderByProps;

frontend/src/container/QueryBuilder/filters/Formula/OrderBy/useOrderByFormulaFilter.tsx

@@ -1,129 +0,0 @@
-import { useMemo, useState } from 'react';
-import { DEBOUNCE_DELAY } from 'constants/queryBuilderFilterConfig';
-import useDebounce from 'hooks/useDebounce';
-import { IOption } from 'hooks/useResourceAttribute/types';
-import isEqual from 'lodash-es/isEqual';
-import uniqWith from 'lodash-es/uniqWith';
-import { parse } from 'papaparse';
-import { BaseAutocompleteData } from 'types/api/queryBuilder/queryAutocompleteResponse';
-import { OrderByPayload } from 'types/api/queryBuilder/queryBuilderData';
-
-import { ORDERBY_FILTERS } from '../../OrderByFilter/config';
-import { SIGNOZ_VALUE } from '../../OrderByFilter/constants';
-import { UseOrderByFilterResult } from '../../OrderByFilter/useOrderByFilter';
-import {
-	getLabelFromValue,
-	mapLabelValuePairs,
-	orderByValueDelimiter,
-} from '../../OrderByFilter/utils';
-import { getRemoveOrderFromValue } from '../../QueryBuilderSearchV2/utils';
-import { getUniqueOrderByValues, getValidOrderByResult } from '../../utils';
-import { IOrderByFormulaFilterProps } from './types';
-import { transformToOrderByStringValuesByFormula } from './utils';
-
-export const useOrderByFormulaFilter = ({
-	onChange,
-	formula,
-}: IOrderByFormulaFilterProps): UseOrderByFilterResult => {
-	const [searchText, setSearchText] = useState<string>('');
-
-	const debouncedSearchText = useDebounce(searchText, DEBOUNCE_DELAY);
-
-	const handleSearchKeys = (searchText: string): void =>
-		setSearchText(searchText);
-
-	const handleChange = (values: IOption[]): void => {
-		const validResult = getValidOrderByResult(values);
-		const result = getUniqueOrderByValues(validResult);
-
-		const orderByValues: OrderByPayload[] = result.map((item) => {
-			const match = parse(item.value, { delimiter: orderByValueDelimiter });
-
-			if (!match) {
-				return {
-					columnName: item.value,
-					order: ORDERBY_FILTERS.ASC,
-				};
-			}
-
-			const [columnName, order] = match.data.flat() as string[];
-
-			const columnNameValue =
-				columnName === SIGNOZ_VALUE ? SIGNOZ_VALUE : columnName;
-
-			const orderValue = order ?? ORDERBY_FILTERS.ASC;
-
-			return {
-				columnName: columnNameValue,
-				order: orderValue,
-			};
-		});
-
-		setSearchText('');
-		onChange(orderByValues);
-	};
-
-	const aggregationOptions = [
-		{
-			label: `${formula.expression} ${ORDERBY_FILTERS.ASC}`,
-			value: `${SIGNOZ_VALUE}${orderByValueDelimiter}${ORDERBY_FILTERS.ASC}`,
-		},
-		{
-			label: `${formula.expression} ${ORDERBY_FILTERS.DESC}`,
-			value: `${SIGNOZ_VALUE}${orderByValueDelimiter}${ORDERBY_FILTERS.DESC}`,
-		},
-	];
-
-	const selectedValue = transformToOrderByStringValuesByFormula(formula);
-
-	const createOptions = (data: BaseAutocompleteData[]): IOption[] =>
-		mapLabelValuePairs(data).flat();
-
-	const customValue: IOption[] = useMemo(() => {
-		if (!searchText) {
-			return [];
-		}
-
-		return [
-			{
-				label: `${searchText} ${ORDERBY_FILTERS.ASC}`,
-				value: `${searchText}${orderByValueDelimiter}${ORDERBY_FILTERS.ASC}`,
-			},
-			{
-				label: `${searchText} ${ORDERBY_FILTERS.DESC}`,
-				value: `${searchText}${orderByValueDelimiter}${ORDERBY_FILTERS.DESC}`,
-			},
-		];
-	}, [searchText]);
-
-	const generateOptions = (options: IOption[]): IOption[] => {
-		const currentCustomValue = options.find(
-			(keyOption) =>
-				getRemoveOrderFromValue(keyOption.value) === debouncedSearchText,
-		)
-			? []
-			: customValue;
-
-		const result = [...currentCustomValue, ...options];
-
-		const uniqResult = uniqWith(result, isEqual);
-
-		return uniqResult.filter(
-			(option) =>
-				!getLabelFromValue(selectedValue).includes(
-					getRemoveOrderFromValue(option.value),
-				),
-		);
-	};
-
-	return {
-		searchText,
-		debouncedSearchText,
-		selectedValue,
-		aggregationOptions,
-		createOptions,
-		handleChange,
-		handleSearchKeys,
-		generateOptions,
-	};
-};

frontend/src/container/QueryBuilder/filters/Formula/OrderBy/utils.ts

@@ -1,26 +0,0 @@
-import { IOption } from 'hooks/useResourceAttribute/types';
-import { IBuilderFormula } from 'types/api/queryBuilder/queryBuilderData';
-
-import { SIGNOZ_VALUE } from '../../OrderByFilter/constants';
-import { orderByValueDelimiter } from '../../OrderByFilter/utils';
-
-export const transformToOrderByStringValuesByFormula = (
-	formula: IBuilderFormula,
-): IOption[] => {
-	const prepareSelectedValue: IOption[] =
-		formula?.orderBy?.map((item) => {
-			if (item.columnName === SIGNOZ_VALUE) {
-				return {
-					label: `${formula.expression} ${item.order}`,
-					value: `${item.columnName}${orderByValueDelimiter}${item.order}`,
-				};
-			}
-
-			return {
-				label: `${item.columnName} ${item.order}`,
-				value: `${item.columnName}${orderByValueDelimiter}${item.order}`,
-			};
-		}) || [];
-
-	return prepareSelectedValue;
-};

frontend/src/container/QueryBuilder/filters/OrderByFilter/OrderByFilter.interfaces.ts

@@ -6,7 +6,7 @@ import {
 export type OrderByFilterProps = {
 	query: IBuilderQuery;
 	onChange: (values: OrderByPayload[]) => void;
-	isListViewPanel?: boolean;
+	isRawQuery?: boolean;
 	entityVersion?: string;
 	isNewQueryV2?: boolean;
 };

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

@@ -12,7 +12,7 @@ import { useOrderByFilter } from './useOrderByFilter';
 export function OrderByFilter({
 	query,
 	onChange,
-	isListViewPanel = false,
+	isRawQuery = false,
 	entityVersion,
 	isNewQueryV2 = false,
 }: OrderByFilterProps): JSX.Element {
@@ -35,7 +35,7 @@ export function OrderByFilter({
 			searchText: debouncedSearchText,
 		},
 		{
-			enabled: !!query.aggregateAttribute?.key || isListViewPanel,
+			enabled: !!query.aggregateAttribute?.key || isRawQuery,
 			keepPreviousData: true,
 		},
 	);

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

@@ -19,7 +19,6 @@ import {
 	QUERY_BUILDER_SEARCH_VALUES,
 } from 'constants/queryBuilder';
 import { DEBOUNCE_DELAY } from 'constants/queryBuilderFilterConfig';
-import type { WhereClauseConfig } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import { LogsExplorerShortcuts } from 'constants/shortcuts/logsExplorerShortcuts';
 import { useDynamicVariableSuggestions } from 'hooks/dashboard/useDynamicVariableSuggestions';
 import { useKeyboardHotkeys } from 'hooks/hotkeys/useKeyboardHotkeys';
@@ -88,7 +87,6 @@ interface CustomTagProps {
 interface QueryBuilderSearchV2Props {
 	query: IBuilderQuery;
 	onChange: (value: TagFilter) => void;
-	whereClauseConfig?: WhereClauseConfig;
 	placeholder?: string;
 	className?: string;
 	suffixIcon?: React.ReactNode;
@@ -145,7 +143,6 @@ function QueryBuilderSearchV2(
 		placeholder,
 		className,
 		suffixIcon,
-		whereClauseConfig,
 		hardcodedAttributeKeys,
 		hasPopupContainer,
 		rootClassName,
@@ -477,31 +474,7 @@ function QueryBuilderSearchV2(
 		if (searchValue) {
 			const operatorType =
 				operatorTypeMapper[currentFilterItem?.op || ''] || 'NOT_VALID';
-			// if key is added and operator is not present then convert to body CONTAINS key
 			if (
-				currentFilterItem?.key &&
-				isEmpty(currentFilterItem?.op) &&
-				whereClauseConfig?.customKey === 'body' &&
-				whereClauseConfig?.customOp === OPERATORS.CONTAINS
-			) {
-				// eslint-disable-next-line sonarjs/no-identical-functions
-				setTags((prev) => [
-					...prev,
-					{
-						key: {
-							key: 'body',
-							dataType: DataTypes.String,
-							type: '',
-							id: 'body--string----true',
-						},
-						op: OPERATORS.CONTAINS,
-						value: currentFilterItem?.key?.key,
-					},
-				]);
-				setCurrentFilterItem(undefined);
-				setSearchValue('');
-				setCurrentState(DropdownState.ATTRIBUTE_KEY);
-			} else if (
 				currentFilterItem?.op === OPERATORS.EXISTS ||
 				currentFilterItem?.op === OPERATORS.NOT_EXISTS
 			) {
@@ -543,8 +516,6 @@ function QueryBuilderSearchV2(
 		currentFilterItem?.op,
 		currentFilterItem?.value,
 		searchValue,
-		whereClauseConfig?.customKey,
-		whereClauseConfig?.customOp,
 	]);
 
 	// this useEffect takes care of tokenisation based on the search state
@@ -1085,7 +1056,6 @@ QueryBuilderSearchV2.defaultProps = {
 	placeholder: PLACEHOLDER,
 	className: '',
 	suffixIcon: null,
-	whereClauseConfig: {},
 	hasPopupContainer: true,
 	rootClassName: '',
 	hardcodedAttributeKeys: undefined,

frontend/src/container/QueryBuilder/type.ts

@@ -26,7 +26,7 @@ export type QueryProps = {
 	isAvailableToDisable: boolean;
 	query: IBuilderQuery;
 	queryVariant?: 'static' | 'dropdown';
-	isListViewPanel?: boolean;
+	isRawQuery?: boolean;
 	showFunctions?: boolean;
 	version: string;
 	showSpanScopeSelector?: boolean;
@@ -35,4 +35,4 @@ export type QueryProps = {
 	hasTraceOperator?: boolean;
 	signalSource?: string;
 	isMultiQueryAllowed?: boolean;
-} & Pick<QueryBuilderProps, 'filterConfigs' | 'queryComponents'>;
+} & Pick<QueryBuilderProps, 'fieldsConfig' | 'allowedDataSources'>;

frontend/src/container/TracesExplorer/QuerySection/index.tsx

@@ -1,55 +1,23 @@
-import { memo, useCallback, useMemo } from 'react';
+import { memo, useMemo } from 'react';
 import { QueryBuilderV2 } from 'components/QueryBuilderV2/QueryBuilderV2';
 import { PANEL_TYPES } from 'constants/queryBuilder';
-import ExplorerOrderBy from 'container/ExplorerOrderBy';
-import { OrderByFilterProps } from 'container/QueryBuilder/filters/OrderByFilter/OrderByFilter.interfaces';
-import { QueryBuilderProps } from 'container/QueryBuilder/QueryBuilder.interfaces';
 import { useGetPanelTypesQueryParam } from 'hooks/queryBuilder/useGetPanelTypesQueryParam';
 import { DataSource } from 'types/common/queryBuilder';
 
 function QuerySection(): JSX.Element {
 	const panelTypes = useGetPanelTypesQueryParam(PANEL_TYPES.LIST);
 
-	const filterConfigs: QueryBuilderProps['filterConfigs'] = useMemo(() => {
-		const isList = panelTypes === PANEL_TYPES.LIST;
-		const config: QueryBuilderProps['filterConfigs'] = {
-			stepInterval: { isHidden: false, isDisabled: false },
-			limit: { isHidden: isList, isDisabled: true },
-			having: { isHidden: isList, isDisabled: true },
-		};
-
-		return config;
-	}, [panelTypes]);
-
-	const renderOrderBy = useCallback(
-		({ query, onChange }: OrderByFilterProps) => (
-			<ExplorerOrderBy query={query} onChange={onChange} />
-		),
-		[],
-	);
-
-	const queryComponents = useMemo((): QueryBuilderProps['queryComponents'] => {
-		const shouldRenderCustomOrderBy =
-			panelTypes === PANEL_TYPES.LIST || panelTypes === PANEL_TYPES.TRACE;
-
-		return {
-			...(shouldRenderCustomOrderBy ? { renderOrderBy } : {}),
-		};
-	}, [panelTypes, renderOrderBy]);
-
-	const isListViewPanel = useMemo(
+	const isRawQuery = useMemo(
 		() => panelTypes === PANEL_TYPES.LIST || panelTypes === PANEL_TYPES.TRACE,
 		[panelTypes],
 	);
 
 	return (
 		<QueryBuilderV2
-			isListViewPanel={isListViewPanel}
+			isRawQuery={isRawQuery}
 			showTraceOperator
 			config={{ initialDataSource: DataSource.TRACES, queryVariant: 'static' }}
-			queryComponents={queryComponents}
 			panelType={panelTypes}
-			filterConfigs={filterConfigs}
 			showOnlyWhereClause={
 				panelTypes === PANEL_TYPES.LIST || panelTypes === PANEL_TYPES.TRACE
 			}

frontend/src/container/WidgetCard/Card/FullView/contants.ts

@@ -29,5 +29,6 @@ export const PANEL_TYPES_VS_FULL_VIEW_TABLE: PanelTypeAndGraphManagerVisibilityP
 		BAR: true,
 		PIE: false,
 		HISTOGRAM: false,
+		HEATMAP: false,
 		EMPTY_WIDGET: false,
 	};

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

@@ -316,7 +316,7 @@ function FullView({
 								<QueryBuilderV2
 									panelType={selectedPanelType}
 									version="v3"
-									isListViewPanel={selectedPanelType === PANEL_TYPES.LIST}
+									isRawQuery={selectedPanelType === PANEL_TYPES.LIST}
 									signalSourceChangeEnabled
 									// filterConfigs={filterConfigs}
 									// queryComponents={queryComponents}

frontend/src/container/WidgetCard/Panels/constants.ts

@@ -18,4 +18,6 @@ export const PanelTypeVsPanelWrapper = {
 	[PANEL_TYPES.PIE]: PiePanelWrapper,
 	[PANEL_TYPES.BAR]: BarPanel,
 	[PANEL_TYPES.HISTOGRAM]: HistogramPanel,
+	// V2-only kind; it renders through the V2 panel registry.
+	[PANEL_TYPES.HEATMAP]: null,
 };

frontend/src/hooks/queryBuilder/__tests__/useQueryBuilderOperations.test.ts

@@ -62,14 +62,14 @@ describe('useQueryBuilderOperations - Empty Aggregate Attribute Type', () => {
 		legend: '',
 	};
 
-	const setupMockQueryBuilder = (): void => {
+	const setupMockQueryBuilder = (panelType = 'time_series'): void => {
 		(useQueryBuilder as jest.Mock).mockReturnValue({
 			handleSetQueryData: mockHandleSetQueryData,
 			handleSetFormulaData: mockHandleSetFormulaData,
 			removeQueryBuilderEntityByIndex: mockRemoveQueryBuilderEntityByIndex,
 			setLastUsedQuery: mockSetLastUsedQuery,
 			redirectWithQueryBuilderData: mockRedirectWithQueryBuilderData,
-			panelType: 'time_series',
+			panelType,
 			currentQuery: {
 				builder: {
 					queryData: [defaultMockQuery, defaultMockQuery],
@@ -332,4 +332,85 @@ describe('useQueryBuilderOperations - Empty Aggregate Attribute Type', () => {
 			);
 		});
 	});
+
+	describe('spaceAggregationOptions for a histogram metric', () => {
+		const histogramQuery: IBuilderQuery = {
+			...defaultMockQuery,
+			aggregateAttribute: {
+				key: 'signoz_latency',
+				dataType: DataTypes.Float64,
+				type: ATTRIBUTE_TYPES.HISTOGRAM,
+			} as BaseAutocompleteData,
+		};
+
+		it('offers the percentiles on a time series panel', () => {
+			const result = renderHookWithProps({ query: histogramQuery });
+
+			expect(
+				result.current.spaceAggregationOptions.map((o) => o.value),
+			).toStrictEqual([
+				MetricAggregateOperator.P50,
+				MetricAggregateOperator.P75,
+				MetricAggregateOperator.P90,
+				MetricAggregateOperator.P95,
+				MetricAggregateOperator.P99,
+			]);
+		});
+
+		it('offers sum alone on a heatmap panel, whose Y axis is the `le` labels', () => {
+			setupMockQueryBuilder('heatmap');
+
+			const result = renderHookWithProps({ query: histogramQuery });
+
+			expect(
+				result.current.spaceAggregationOptions.map((o) => o.value),
+			).toStrictEqual([MetricAggregateOperator.SUM]);
+		});
+	});
+
+	describe('picking a histogram metric', () => {
+		const histogramAttribute: BaseAutocompleteData = {
+			key: 'http.client.duration.bucket',
+			dataType: DataTypes.Float64,
+			type: ATTRIBUTE_TYPES.HISTOGRAM,
+		};
+
+		it('defaults the spatial aggregation to p90 on a time series panel', () => {
+			const result = renderHookWithProps({ entityVersion: ENTITY_VERSION_V5 });
+			act(() => {
+				result.current.handleChangeAggregatorAttribute(histogramAttribute);
+			});
+
+			expect(mockHandleSetQueryData).toHaveBeenLastCalledWith(
+				0,
+				expect.objectContaining({
+					aggregations: [
+						expect.objectContaining({
+							spaceAggregation: MetricAggregateOperator.P90,
+						}),
+					],
+				}),
+			);
+		});
+
+		it('defaults it to sum on a heatmap panel, which offers nothing else', () => {
+			setupMockQueryBuilder('heatmap');
+
+			const result = renderHookWithProps({ entityVersion: ENTITY_VERSION_V5 });
+			act(() => {
+				result.current.handleChangeAggregatorAttribute(histogramAttribute);
+			});
+
+			expect(mockHandleSetQueryData).toHaveBeenLastCalledWith(
+				0,
+				expect.objectContaining({
+					aggregations: [
+						expect.objectContaining({
+							spaceAggregation: MetricAggregateOperator.SUM,
+						}),
+					],
+				}),
+			);
+		});
+	});
 });

frontend/src/hooks/queryBuilder/useQueryBuilderOperations.ts

@@ -14,12 +14,11 @@ import {
 	initialQueryBuilderFormValuesMap,
 	listViewInitialLogQuery,
 	listViewInitialTraceQuery,
-	mapOfFormulaToFilters,
-	mapOfQueryFilters,
 	PANEL_TYPES,
 } from 'constants/queryBuilder';
 import {
 	metricsGaugeSpaceAggregateOperatorOptions,
+	metricsHeatmapHistogramSpaceAggregateOperatorOptions,
 	metricsHistogramSpaceAggregateOperatorOptions,
 	metricsSumSpaceAggregateOperatorOptions,
 	metricsUnknownSpaceAggregateOperatorOptions,
@@ -59,9 +58,8 @@ import { getFormatedLegend } from 'utils/getFormatedLegend';
 export const useQueryOperations: UseQueryOperations = ({
 	query,
 	index,
-	filterConfigs,
 	formula,
-	isListViewPanel = false,
+	isRawQuery = false,
 	entityVersion,
 	isForTraceOperator = false,
 	savePreviousQuery = false,
@@ -105,46 +103,7 @@ export const useQueryOperations: UseQueryOperations = ({
 		}
 	}, [query]);
 
-	const { dataSource, aggregateOperator } = query;
-
-	const getNewListOfAdditionalFilters = useCallback(
-		(dataSource: DataSource, isQuery: boolean): string[] => {
-			const additionalFiltersKeys: (keyof Pick<
-				IBuilderQuery,
-				'orderBy' | 'limit' | 'having' | 'stepInterval'
-			>)[] = ['having', 'limit', 'orderBy', 'stepInterval'];
-
-			const mapsOfFilters = isQuery ? mapOfQueryFilters : mapOfFormulaToFilters;
-
-			const result: string[] = mapsOfFilters[dataSource]?.reduce<string[]>(
-				(acc, item) => {
-					if (
-						filterConfigs &&
-						filterConfigs[item.field as (typeof additionalFiltersKeys)[number]]
-							?.isHidden
-					) {
-						return acc;
-					}
-
-					acc.push(item.text);
-
-					return acc;
-				},
-				[],
-			);
-
-			return result;
-		},
-
-		[filterConfigs],
-	);
-
-	const [listOfAdditionalFilters, setListOfAdditionalFilters] = useState<
-		string[]
-	>(getNewListOfAdditionalFilters(dataSource, true));
-
-	const [listOfAdditionalFormulaFilters, setListOfAdditionalFormulaFilters] =
-		useState<string[]>(getNewListOfAdditionalFilters(dataSource, false));
+	const { dataSource } = query;
 
 	const handleChangeOperator = useCallback(
 		(value: string): void => {
@@ -218,6 +177,11 @@ export const useQueryOperations: UseQueryOperations = ({
 							(aggregateAttribute?.type as ATTRIBUTE_TYPES) || ATTRIBUTE_TYPES.GAUGE,
 					});
 
+			const histogramSpaceAggregationOptions =
+				panelType === PANEL_TYPES.HEATMAP
+					? metricsHeatmapHistogramSpaceAggregateOperatorOptions
+					: metricsHistogramSpaceAggregateOperatorOptions;
+
 			switch (aggregateAttribute?.type) {
 				case ATTRIBUTE_TYPES.SUM:
 					setSpaceAggregationOptions(metricsSumSpaceAggregateOperatorOptions);
@@ -227,11 +191,11 @@ export const useQueryOperations: UseQueryOperations = ({
 					break;
 
 				case ATTRIBUTE_TYPES.HISTOGRAM:
-					setSpaceAggregationOptions(metricsHistogramSpaceAggregateOperatorOptions);
+					setSpaceAggregationOptions(histogramSpaceAggregationOptions);
 					break;
 
 				case ATTRIBUTE_TYPES.EXPONENTIAL_HISTOGRAM:
-					setSpaceAggregationOptions(metricsHistogramSpaceAggregateOperatorOptions);
+					setSpaceAggregationOptions(histogramSpaceAggregationOptions);
 					break;
 				default:
 					setSpaceAggregationOptions(metricsUnknownSpaceAggregateOperatorOptions);
@@ -340,7 +304,12 @@ export const useQueryOperations: UseQueryOperations = ({
 									timeAggregation: '',
 									metricName: newQuery.aggregateAttribute?.key || '',
 									temporality: '',
-									spaceAggregation: MetricAggregateOperator.P90,
+									// A heatmap draws the `le` counts themselves and offers sum alone, so
+									// a percentile default would sit in the selector with no option behind it.
+									spaceAggregation:
+										panelType === PANEL_TYPES.HEATMAP
+											? MetricAggregateOperator.SUM
+											: MetricAggregateOperator.P90,
 									reduceTo: ReduceOperators.AVG,
 								},
 							];
@@ -430,6 +399,7 @@ export const useQueryOperations: UseQueryOperations = ({
 			index,
 			handleMetricAggregateAtributeTypes,
 			previousMetricInfo,
+			panelType,
 		],
 	);
 
@@ -460,7 +430,7 @@ export const useQueryOperations: UseQueryOperations = ({
 				removeKeyFromPreviousQuery(newKey);
 			}
 
-			if (isListViewPanel) {
+			if (isRawQuery) {
 				let listPanelQuery: Query | null = null;
 
 				if (nextSource === DataSource.LOGS) {
@@ -506,7 +476,7 @@ export const useQueryOperations: UseQueryOperations = ({
 			handleSetQueryData(index, newQueryData);
 		},
 		[
-			isListViewPanel,
+			isRawQuery,
 			panelType,
 			query,
 			handleSetQueryData,
@@ -625,32 +595,18 @@ export const useQueryOperations: UseQueryOperations = ({
 		handleMetricAggregateAtributeTypes,
 	]);
 
-	useEffect(() => {
-		const additionalFilters = getNewListOfAdditionalFilters(dataSource, true);
-
-		setListOfAdditionalFilters(additionalFilters);
-	}, [dataSource, aggregateOperator, getNewListOfAdditionalFilters]);
-
-	useEffect(() => {
-		const additionalFilters = getNewListOfAdditionalFilters(dataSource, false);
-
-		setListOfAdditionalFormulaFilters(additionalFilters);
-	}, [dataSource, aggregateOperator, getNewListOfAdditionalFilters]);
-
 	return {
 		isTracePanelType,
 		isMetricsDataSource,
 		isLogsDataSource,
 		operators,
 		spaceAggregationOptions,
-		listOfAdditionalFilters,
 		handleChangeOperator,
 		handleSpaceAggregationChange,
 		handleChangeAggregatorAttribute,
 		handleChangeDataSource,
 		handleDeleteQuery,
 		handleChangeQueryData,
-		listOfAdditionalFormulaFilters,
 		handleChangeFormulaData,
 		handleQueryFunctionsUpdates,
 	};

frontend/src/hooks/useGetYAxisUnit.test.ts

@@ -222,6 +222,31 @@ describe('useGetYAxisUnit', () => {
 		expect(result.current.isError).toBe(false);
 	});
 
+	it('resolves the unit on the first render, without a settling pass', () => {
+		// The real `useGetMetrics` rebuilds its array on every render; a hook that
+		// stored the unit would need an extra render to settle, and would schedule one
+		// after every render of the panel editor.
+		mockUseGetMetrics.mockImplementation(() => ({
+			isLoading: false,
+			isError: false,
+			metrics: [MOCK_METRIC_1],
+		}));
+
+		let renderCount = 0;
+		const { result, rerender } = renderHook(() => {
+			renderCount += 1;
+			return useGetYAxisUnit();
+		});
+
+		expect(result.current.yAxisUnit).toBe(UniversalYAxisUnit.BYTES);
+		expect(renderCount).toBe(1);
+
+		rerender();
+
+		expect(result.current.yAxisUnit).toBe(UniversalYAxisUnit.BYTES);
+		expect(renderCount).toBe(2);
+	});
+
 	it('should return undefined when metrics have different units', async () => {
 		mockUseGetMetrics.mockReturnValueOnce({
 			isLoading: false,

frontend/src/hooks/useGetYAxisUnit.ts

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState } from 'react';
+import { useMemo } from 'react';
 import {
 	getMetricUnits,
 	useGetMetrics,
@@ -46,7 +46,6 @@ function useGetYAxisUnit(
 	},
 ): UseGetYAxisUnitResult {
 	const { stagedQuery } = useQueryBuilder();
-	const [yAxisUnit, setYAxisUnit] = useState<string | undefined>();
 
 	const metricNames: string[] | null = useMemo(() => {
 		// If the query type is not QUERY_BUILDER, return null
@@ -95,27 +94,16 @@ function useGetYAxisUnit(
 		[units],
 	);
 
-	useEffect(() => {
-		// If there are no metrics, set the y-axis unit to undefined
-		if (units.length === 0) {
-			setYAxisUnit(undefined);
-			// If there is one metric and it has a non-empty unit, set the y-axis unit to it
-		} else if (units.length === 1 && units[0] !== '') {
-			setYAxisUnit(units[0]);
-			// If all metrics have the same non-empty unit, set the y-axis unit to it
-		} else if (areAllMetricUnitsSame) {
-			if (units[0] !== '') {
-				setYAxisUnit(units[0]);
-			} else {
-				setYAxisUnit(undefined);
-			}
-			// If there is more than one metric and they have different units, set the y-axis unit to undefined
-		} else if (units.length > 1 && !areAllMetricUnitsSame) {
-			setYAxisUnit(undefined);
-			// If there is one metric and it has an empty unit, set the y-axis unit to undefined
-		} else if (units.length === 1 && units[0] === '') {
-			setYAxisUnit(undefined);
+	// Derived, not stored: `useGetMetrics` rebuilds its array on every render, so a
+	// state-and-effect version schedules an update after every render — the shape
+	// React reports as "Maximum update depth exceeded".
+	const yAxisUnit = useMemo(() => {
+		// A single shared unit is the only thing a single axis can carry; metrics that
+		// disagree, or that carry no unit at all, leave the axis unitless.
+		if (units.length === 0 || !areAllMetricUnitsSame) {
+			return undefined;
 		}
+		return units[0] || undefined;
 	}, [units, areAllMetricUnitsSame]);
 
 	return { yAxisUnit, isLoading, isError };

frontend/src/lib/query/panelQuery.ts

@@ -99,6 +99,7 @@ export type PartialPanelTypes = {
 	[PANEL_TYPES.VALUE]: 'value';
 	[PANEL_TYPES.PIE]: 'pie';
 	[PANEL_TYPES.HISTOGRAM]: 'histogram';
+	[PANEL_TYPES.HEATMAP]: 'heatmap';
 };
 
 export const panelTypeDataSourceFormValuesMap: Record<
@@ -306,6 +307,74 @@ export const panelTypeDataSourceFormValuesMap: Record<
 			},
 		},
 	},
+	// `functions` and `having` are dropped rather than carried: the heatmap request
+	// rejects both. Every signal is listed because the map is keyed by the query's
+	// own, which a switch can still be holding.
+	[PANEL_TYPES.HEATMAP]: {
+		[DataSource.LOGS]: {
+			builder: {
+				queryData: [
+					'aggregateAttribute',
+					'aggregateOperator',
+					'timeAggregation',
+					'filters',
+					'filter',
+					'spaceAggregation',
+					'groupBy',
+					'limit',
+					'orderBy',
+					'stepInterval',
+					'legend',
+					'queryName',
+					'disabled',
+					'expression',
+					'aggregations',
+				],
+			},
+		},
+		[DataSource.METRICS]: {
+			builder: {
+				queryData: [
+					'aggregateAttribute',
+					'aggregateOperator',
+					'timeAggregation',
+					'filters',
+					'filter',
+					'spaceAggregation',
+					'groupBy',
+					'limit',
+					'orderBy',
+					'stepInterval',
+					'legend',
+					'queryName',
+					'disabled',
+					'expression',
+					'aggregations',
+				],
+			},
+		},
+		[DataSource.TRACES]: {
+			builder: {
+				queryData: [
+					'aggregateAttribute',
+					'aggregateOperator',
+					'timeAggregation',
+					'filters',
+					'filter',
+					'spaceAggregation',
+					'groupBy',
+					'limit',
+					'orderBy',
+					'stepInterval',
+					'legend',
+					'queryName',
+					'disabled',
+					'expression',
+					'aggregations',
+				],
+			},
+		},
+	},
 	[PANEL_TYPES.TABLE]: {
 		[DataSource.LOGS]: {
 			builder: {

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

@@ -0,0 +1,78 @@
+.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(--muted-foreground);
+	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);
+	// Reads against the panel through the 3px it overhangs the track at either end,
+	// which is what carries it where the ramp happens to match it.
+	background: var(--popover-foreground);
+	border-radius: 1px;
+}
+
+.caption {
+	flex: 0 0 auto;
+	font-size: 10px;
+	letter-spacing: 0.06em;
+	text-transform: uppercase;
+	color: var(--muted-foreground);
+}
+
+.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(--muted-foreground);
+}
+
+.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, which `createHatchPattern`
+// strokes in the theme's own direction — light on dark, dark on light.
+.hatchSwatch {
+	background-image: repeating-linear-gradient(
+		45deg,
+		transparent 0 2px,
+		var(--muted-foreground) 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 +1,153 @@
+// Surface matches the shared Tooltip exactly — same tokens, same radius, no
+// shadow (the plugin's portal wrapper is transparent and paints nothing). Text
+// follows the theme through the popover/muted pair; the fixed vanilla ramp reads
+// as white-on-white in light mode.
+//
+// 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(--muted-foreground);
+	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(--popover-foreground);
+}
+
+.titleCount {
+	font-size: 13px;
+	font-weight: 600;
+	color: var(--popover-foreground);
+	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(--muted-foreground);
+	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(--muted-foreground);
+	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(--popover-foreground);
+	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(--muted-foreground);
+	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} → \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/__tests__/heatmapTooltipContent.test.ts

@@ -0,0 +1,37 @@
+import { formatColumnRange } from '../heatmapTooltipContent';
+
+const TIMEZONE = 'UTC';
+/** 2026-09-02T05:30:00Z. */
+const START = 1_788_327_000;
+
+describe('formatColumnRange', () => {
+	it('dates both ends of the column', () => {
+		expect(
+			formatColumnRange({ start: START, step: 9 * 3600, timezone: TIMEZONE }),
+		).toBe('09/02 05:30 → 09/02 14:30');
+	});
+
+	it('carries the date across a column that spans days', () => {
+		expect(
+			formatColumnRange({ start: START, step: 2 * 86_400, timezone: TIMEZONE }),
+		).toBe('09/02 05:30 → 09/04 05:30');
+	});
+
+	it('adds seconds for a sub-minute column, which times alone cannot separate', () => {
+		expect(
+			formatColumnRange({ start: START, step: 30, timezone: TIMEZONE }),
+		).toBe('09/02 05:30:00 → 09/02 05:30:30');
+	});
+
+	it('reads the day in the panel timezone, not UTC', () => {
+		// 05:30Z is the previous evening in Los Angeles, so the same column reads as
+		// crossing a date boundary there and not in UTC.
+		expect(
+			formatColumnRange({
+				start: START,
+				step: 9 * 3600,
+				timezone: 'America/Los_Angeles',
+			}),
+		).toBe('09/01 22:30 → 09/02 07:30');
+	});
+});

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

@@ -0,0 +1,206 @@
+import { PrecisionOption } from 'components/Graph/types';
+import { getToolTipValue } from 'components/Graph/yAxisConfig';
+import { DATE_TIME_FORMATS } from 'constants/dateTimeFormats';
+import dayjs from 'dayjs';
+import timezonePlugin from 'dayjs/plugin/timezone';
+import utc from 'dayjs/plugin/utc';
+import { formatRowLabel } from 'lib/uPlotV2/plugins/HeatmapPlugin/geometry';
+import {
+	HeatmapSeries,
+	HeatmapYAxis,
+} from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+
+dayjs.extend(utc);
+dayjs.extend(timezonePlugin);
+
+/** 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. Both ends carry the date: the x axis prints one only where the day
+ *  turns over, so on a wide window a bare time does not say which day it is in. */
+export function formatColumnRange({
+	start,
+	step,
+	timezone,
+}: {
+	/** Column start, in seconds. */
+	start: number;
+	/** Column width, in seconds. */
+	step: number;
+	timezone: string;
+}): string {
+	const time =
+		step < SUB_MINUTE_STEP
+			? DATE_TIME_FORMATS.TIME_SECONDS
+			: DATE_TIME_FORMATS.TIME;
+	const format = `${DATE_TIME_FORMATS.DATE_SHORT} ${time}`;
+	const from = dayjs(start * 1000).tz(timezone);
+	const to = dayjs((start + step) * 1000).tz(timezone);
+	return `${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

@@ -148,6 +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;
 
@@ -179,6 +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/types.ts

@@ -78,6 +78,8 @@ export interface AxisProps {
 	};
 	/** 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. */

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

@@ -0,0 +1,268 @@
+import {
+	clampColorSteps,
+	createHeatmapColorResolver,
+	DEFAULT_COLOR_STEPS,
+	DEFAULT_HEATMAP_COLORS,
+	getMaxCount,
+	getSmallestPositiveCount,
+	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('getSmallestPositiveCount', () => {
+	it('ignores nulls, zeros and non-finite counts', () => {
+		expect(
+			getSmallestPositiveCount([
+				[0, null, 4],
+				[Number.NaN, 2, -3],
+			]),
+		).toBe(2);
+	});
+
+	it('returns null when nothing is above zero', () => {
+		expect(getSmallestPositiveCount([[0, null]])).toBeNull();
+	});
+});
+
+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,
+			logFloor: 5,
+		});
+	});
+
+	it('honours explicit clamps', () => {
+		expect(
+			resolveCountDomain({ minCount: 10, maxCount: 100 }, [[5, 20]]),
+		).toStrictEqual({
+			min: 10,
+			max: 100,
+			logFloor: 5,
+		});
+	});
+
+	it('collapses a max at or below min', () => {
+		expect(
+			resolveCountDomain({ minCount: 50, maxCount: 10 }, [[5]]),
+		).toStrictEqual({
+			min: 50,
+			max: 50,
+			logFloor: 5,
+		});
+	});
+
+	it('takes the log floor from the smallest positive count, below 1 included', () => {
+		expect(
+			resolveCountDomain({ minCount: null, maxCount: null }, [[0, 0.02, 0.8]])
+				.logFloor,
+		).toBeCloseTo(0.02, 6);
+	});
+
+	it('keeps the log floor within MAX_LOG_DECADES of the max', () => {
+		expect(
+			resolveCountDomain({ minCount: null, maxCount: null }, [[1, 1e9]]).logFloor,
+		).toBe(1e3);
+	});
+
+	it('falls back to a floor of 1 for a grid without a positive count', () => {
+		expect(
+			resolveCountDomain({ minCount: null, maxCount: null }, [[null, 0]]).logFloor,
+		).toBe(1);
+	});
+});
+
+describe('normalizeCount', () => {
+	const domain = { min: 0, max: 1000, logFloor: 1 };
+
+	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, logFloor: 1 },
+				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, logFloor: 1 },
+				scale: HeatmapColorScale.Log,
+			}),
+		).toBe(0);
+	});
+
+	it('spreads a log domain that sits entirely below a count of 1', () => {
+		const fractional = { min: 0, max: 1, logFloor: 0.001 };
+		const log = (count: number): number =>
+			normalizeCount({
+				count,
+				domain: fractional,
+				scale: HeatmapColorScale.Log,
+			});
+
+		expect(log(0.001)).toBe(0);
+		expect(log(0.1)).toBeCloseTo(2 / 3, 5);
+		expect(log(1)).toBeCloseTo(1, 6);
+	});
+
+	it('reads a log scale linearly when the floor reaches the top of the domain', () => {
+		const domainAtFloor = { min: 0, max: 1, logFloor: 1 };
+
+		expect(
+			normalizeCount({
+				count: 1,
+				domain: domainAtFloor,
+				scale: HeatmapColorScale.Log,
+			}),
+		).toBe(1);
+		expect(
+			normalizeCount({
+				count: 0.5,
+				domain: domainAtFloor,
+				scale: HeatmapColorScale.Log,
+			}),
+		).toBe(0.5);
+	});
+});
+
+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, logFloor: 1 },
+			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, logFloor: 1 });
+	});
+});

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

@@ -0,0 +1,634 @@
+import {
+	canUseLogAxis,
+	decimateAxisSplits,
+	formatRowLabel,
+	resolveColumnAlignedSplits,
+	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 — the scale auto picks', () => {
+	// 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.Auto);
+		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.Auto);
+
+		// A linear fallback would leave the boundaries untransformed.
+		expect(splits).not.toStrictEqual([0, 5, 10]);
+	});
+
+	it('is what an all-positive layout does NOT get — that stays a plain log', () => {
+		const { splits } = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Auto);
+
+		expect(splits).toStrictEqual(BOUNDS.map((bound) => Math.log10(bound)));
+	});
+
+	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.Auto)).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.Auto);
+		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.Auto);
+
+		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.Auto,
+		);
+
+		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.Auto,
+		);
+		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.Auto,
+		);
+
+		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.Auto);
+
+		expect(splits).toStrictEqual([0]);
+	});
+});
+
+describe('resolveHeatmapYAxis — an explicitly chosen scale', () => {
+	// The low end of the OTel SDK defaults: a zero bucket, then positive bounds.
+	const ZERO_HEAD = [0, 5, 10, 25];
+	// Clock skew in ms — a field that straddles zero.
+	const SKEW = [-100, -10, 0, 10, 100];
+
+	/** Row heights in axis units, which map linearly to pixels. */
+	function rowHeights(bounds: number[], scale: HeatmapAxisScale): number[] {
+		const { edges } = resolveHeatmapYAxis(bounds, scale);
+		return edges.slice(1).map((edge, index) => edge - edges[index]);
+	}
+
+	it('log stays a plain log10 for a positive layout', () => {
+		const { splits } = resolveHeatmapYAxis(BOUNDS, HeatmapAxisScale.Log);
+
+		expect(splits).toStrictEqual(BOUNDS.map((bound) => Math.log10(bound)));
+	});
+
+	it('log keeps its own answer for a zero bucket rather than becoming a symlog', () => {
+		const { splits } = resolveHeatmapYAxis(ZERO_HEAD, HeatmapAxisScale.Log);
+		// One bucket below the smallest positive bound, where a symlog would put it
+		// a whole decade below.
+		const gap = (Math.log10(25) - Math.log10(5)) / 2;
+
+		expect(splits[0]).toBeCloseTo(Math.log10(5) - gap, 6);
+		expect(splits.slice(1)).toStrictEqual([5, 10, 25].map((b) => Math.log10(b)));
+	});
+
+	it('log spends a bucket on the zero-crossing row where symlog spends a decade', () => {
+		const gap = (Math.log10(25) - Math.log10(5)) / 2;
+
+		// Row 1 is (0, 5] — the row above the zero bucket.
+		expect(rowHeights(ZERO_HEAD, HeatmapAxisScale.Log)[1]).toBeCloseTo(gap, 6);
+		expect(rowHeights(ZERO_HEAD, HeatmapAxisScale.Symlog)[1]).toBeCloseTo(1, 6);
+	});
+
+	it('log leaves every edge ascending with a zero bucket in the layout', () => {
+		const { edges } = resolveHeatmapYAxis(ZERO_HEAD, HeatmapAxisScale.Log);
+
+		expect([...edges].sort((a, b) => a - b)).toStrictEqual(edges);
+	});
+
+	it('log squashes several non-positive boundaries onto one edge — what symlog is for', () => {
+		const { edges } = resolveHeatmapYAxis(SKEW, HeatmapAxisScale.Log);
+
+		// -100, -10 and 0 have no logarithm and share the floor.
+		expect(edges[1]).toBe(edges[2]);
+		expect(edges[2]).toBe(edges[3]);
+		expect([...edges].sort((a, b) => a - b)).toStrictEqual(edges);
+	});
+
+	it('log has nothing to compress without a positive boundary and stays linear', () => {
+		const { splits } = resolveHeatmapYAxis([-5, 0], HeatmapAxisScale.Log);
+
+		expect(splits).toStrictEqual([-5, 0]);
+	});
+
+	it('symlog is a choice for a positive layout too, and is not the log axis', () => {
+		const positive = [1, 10, 100];
+
+		expect(
+			resolveHeatmapYAxis(positive, HeatmapAxisScale.Log).splits,
+		).toStrictEqual([0, 1, 2]);
+		// Threshold 1: the boundaries sit a decade apart, one unit above the linear band.
+		expect(
+			resolveHeatmapYAxis(positive, HeatmapAxisScale.Symlog).splits,
+		).toStrictEqual([1, 2, 3]);
+	});
+
+	it('symlog places boundaries either side of zero symmetrically', () => {
+		const heights = rowHeights(SKEW, HeatmapAxisScale.Symlog);
+
+		expect(Math.max(...heights) - Math.min(...heights)).toBeCloseTo(0, 6);
+	});
+
+	it('symlog has no magnitude to scale against when every boundary is zero', () => {
+		const { splits } = resolveHeatmapYAxis([0], HeatmapAxisScale.Symlog);
+
+		expect(splits).toStrictEqual([0]);
+	});
+});
+
+describe('resolveColumnAlignedSplits', () => {
+	const MINUTE = 60;
+	const HOUR = 3600;
+	const DAY = 86400;
+
+	/** uPlot's `tzDate` for a fixed-offset zone: the returned date's local fields
+	 *  read as that zone's wall clock, whatever the machine's own zone is. */
+	const zoneAt =
+		(offsetSeconds: number) =>
+		(timestamp: number): Date => {
+			const browserOffset =
+				-new Date(timestamp * 1e3).getTimezoneOffset() * MINUTE;
+			return new Date((timestamp + offsetSeconds - browserOffset) * 1e3);
+		};
+
+	const UTC = zoneAt(0);
+	/** IST, whose half-hour offset is what pulls ticks off round local times. */
+	const IST = zoneAt(5.5 * HOUR);
+	/** 2024-03-11T00:00:00Z, a Monday. */
+	const MIDNIGHT_UTC = 1_710_115_200;
+
+	it('lands every tick on a column edge', () => {
+		const step = 90;
+		const anchor = 1_700_000_010;
+
+		const splits = resolveColumnAlignedSplits({
+			anchor,
+			step,
+			incr: 5 * MINUTE,
+			min: anchor,
+			max: anchor + 40 * step,
+		});
+
+		expect(splits.length).toBeGreaterThan(1);
+		splits.forEach((split) => {
+			expect((split - anchor) % step).toBe(0);
+		});
+	});
+
+	it('rounds the increment up to a whole number of columns', () => {
+		const splits = resolveColumnAlignedSplits({
+			anchor: 0,
+			step: 90,
+			incr: 5 * MINUTE,
+			min: 0,
+			max: HOUR,
+			toDate: UTC,
+		});
+
+		// 300s asked for, 360s is the next multiple of the 90s column.
+		expect(splits[1] - splits[0]).toBe(360);
+	});
+
+	it('covers the visible range without overshooting it', () => {
+		const splits = resolveColumnAlignedSplits({
+			anchor: 1000,
+			step: 100,
+			incr: 200,
+			min: 1050,
+			max: 1650,
+			toDate: UTC,
+		});
+
+		expect(splits[0]).toBeGreaterThanOrEqual(1050);
+		expect(splits[splits.length - 1]).toBeLessThanOrEqual(1650);
+		expect(splits[0] - 200).toBeLessThan(1050);
+	});
+
+	it("starts hourly ticks on the timezone's own hour, not the epoch's", () => {
+		const args = {
+			anchor: MIDNIGHT_UTC,
+			step: 5 * MINUTE,
+			incr: HOUR,
+			min: MIDNIGHT_UTC,
+			max: MIDNIGHT_UTC + 3 * HOUR,
+		};
+
+		// 05:30 IST is midnight UTC, so the two disagree by the half hour.
+		expect(resolveColumnAlignedSplits({ ...args, toDate: UTC })).toStrictEqual([
+			MIDNIGHT_UTC,
+			MIDNIGHT_UTC + HOUR,
+			MIDNIGHT_UTC + 2 * HOUR,
+			MIDNIGHT_UTC + 3 * HOUR,
+		]);
+		expect(resolveColumnAlignedSplits({ ...args, toDate: IST })).toStrictEqual([
+			MIDNIGHT_UTC + 0.5 * HOUR,
+			MIDNIGHT_UTC + 1.5 * HOUR,
+			MIDNIGHT_UTC + 2.5 * HOUR,
+		]);
+	});
+
+	it('gives up the round local time when no column edge carries one', () => {
+		// Hour-wide columns start on the UTC hour, so 00:00 IST is mid-cell and
+		// the nearest edge — 00:30 IST — is as close as the grid gets.
+		const splits = resolveColumnAlignedSplits({
+			anchor: MIDNIGHT_UTC,
+			step: HOUR,
+			incr: HOUR,
+			min: MIDNIGHT_UTC,
+			max: MIDNIGHT_UTC + 2 * HOUR,
+			toDate: IST,
+		});
+
+		expect(splits).toStrictEqual([
+			MIDNIGHT_UTC,
+			MIDNIGHT_UTC + HOUR,
+			MIDNIGHT_UTC + 2 * HOUR,
+		]);
+	});
+
+	it('puts a daily tick on the local day boundary', () => {
+		const splits = resolveColumnAlignedSplits({
+			anchor: MIDNIGHT_UTC,
+			step: 15 * MINUTE,
+			incr: DAY,
+			min: MIDNIGHT_UTC,
+			max: MIDNIGHT_UTC + 3 * DAY,
+			toDate: IST,
+		});
+
+		// 18:30 UTC the previous day is IST midnight, and 15m columns carry it.
+		expect(splits).toHaveLength(3);
+		splits.forEach((split) => {
+			expect(IST(split).getHours()).toBe(0);
+			expect(IST(split).getMinutes()).toBe(0);
+		});
+	});
+
+	it('walks month ticks as calendar dates, snapped to column edges', () => {
+		const splits = resolveColumnAlignedSplits({
+			anchor: MIDNIGHT_UTC,
+			step: DAY,
+			incr: 28 * DAY,
+			min: MIDNIGHT_UTC,
+			max: MIDNIGHT_UTC + 120 * DAY,
+			toDate: UTC,
+		});
+
+		// Month starts, not a drifting 28-day cadence that repeats a month name.
+		expect(
+			splits.map((split) => new Date(split * 1e3).toISOString()),
+		).toStrictEqual([
+			'2024-04-01T00:00:00.000Z',
+			'2024-05-01T00:00:00.000Z',
+			'2024-06-01T00:00:00.000Z',
+			'2024-07-01T00:00:00.000Z',
+		]);
+	});
+
+	it("falls back to uPlot's own increment without a column width", () => {
+		expect(
+			resolveColumnAlignedSplits({
+				anchor: MIDNIGHT_UTC,
+				step: 0,
+				incr: 5 * MINUTE,
+				min: MIDNIGHT_UTC,
+				max: MIDNIGHT_UTC + 15 * MINUTE,
+				toDate: UTC,
+			}),
+		).toStrictEqual([
+			MIDNIGHT_UTC,
+			MIDNIGHT_UTC + 5 * MINUTE,
+			MIDNIGHT_UTC + 10 * MINUTE,
+			MIDNIGHT_UTC + 15 * MINUTE,
+		]);
+	});
+
+	it('has nothing to place on an empty or inverted range', () => {
+		expect(
+			resolveColumnAlignedSplits({
+				anchor: 0,
+				step: MINUTE,
+				incr: MINUTE,
+				min: 10,
+				max: 10,
+			}),
+		).toStrictEqual([]);
+		expect(
+			resolveColumnAlignedSplits({
+				anchor: 0,
+				step: MINUTE,
+				incr: 0,
+				min: 0,
+				max: 100,
+			}),
+		).toStrictEqual([]);
+	});
+});

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 +1,304 @@
+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('clips the overlay to the plot area', () => {
+		const hooks = createHooks();
+		const { plot, over } = createFakePlot({ left: 10, top: 10 });
+
+		hooks.init(plot);
+		hooks.setCursor(plot);
+
+		// An end cell whose bucket or time slice is only partly in view is positioned
+		// past the axis; the plot area's edge is where the highlight has to stop.
+		const overlay = over.querySelector<HTMLDivElement>(
+			'[data-testid="heatmap-hover-overlay"]',
+		);
+		expect(overlay?.style.overflow).toBe('hidden');
+	});
+
+	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 +1,244 @@
+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;
+
+/** Log's bottom when the grid holds no positive count to take it from. */
+const DEFAULT_LOG_FLOOR = 1;
+
+/** Widest span a single ramp is stretched over on a log scale. */
+const MAX_LOG_DECADES = 6;
+
+/** 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;
+	/** Bottom decade of the log scale: the smallest count it separates from zero.
+	 *  Always positive, since log has no bottom otherwise. */
+	logFloor: 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;
+}
+
+/** Smallest count above zero, ignoring `null`. `null` for a grid without one. */
+export function getSmallestPositiveCount(
+	counts: Array<Array<number | null>>,
+): number | null {
+	let smallest: number | null = null;
+	for (const row of counts) {
+		for (const count of row) {
+			if (
+				count !== null &&
+				Number.isFinite(count) &&
+				count > 0 &&
+				(smallest === null || count < smallest)
+			) {
+				smallest = count;
+			}
+		}
+	}
+	return smallest;
+}
+
+/**
+ * The grid's own resolution: whole counts floor at 1, while a heatmap of rates or
+ * ratios can live entirely below it, where a fixed floor of 1 would flatten every
+ * cell onto the bottom colour. Capped at `MAX_LOG_DECADES` so one stray tiny cell
+ * cannot stretch the ramp over a range nothing else occupies.
+ */
+function resolveLogFloor(
+	counts: Array<Array<number | null>>,
+	max: number,
+): number {
+	const smallest = getSmallestPositiveCount(counts) ?? DEFAULT_LOG_FLOOR;
+	return Math.max(smallest, max / 10 ** MAX_LOG_DECADES);
+}
+
+/** 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);
+	const logFloor = resolveLogFloor(counts, max);
+	return max > min ? { min, max, logFloor } : { min, max: min, logFloor };
+}
+
+/** 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) {
+		// Anything at or below the floor sits at the bottom; log cannot place it.
+		const bottom = Math.max(min, domain.logFloor);
+		const logMin = Math.log10(bottom);
+		const logMax = Math.log10(max);
+		if (logMax > logMin) {
+			return (Math.log10(Math.max(clamped, bottom)) - logMin) / (logMax - logMin);
+		}
+		// The floor already reaches the top of the domain, so there is no span to
+		// spread logarithmically. Fall through rather than flatten the whole grid.
+	}
+
+	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 +1,489 @@
+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),
+	};
+}
+
+/** Symmetric log about the threshold the bucket layout implies. All-zero
+ *  boundaries have no magnitude to scale against and stay linear. */
+function resolveSymlogTransform(bounds: number[]): AxisTransform {
+	if (!bounds.some((bound) => bound !== 0)) {
+		return LINEAR_TRANSFORM;
+	}
+	return createSymlogTransform(resolveLinearThreshold(bounds));
+}
+
+/** One typical bucket, in axis space — the mean ratio between adjacent positive
+ *  boundaries, which on a geometric layout is exactly one bucket. */
+function resolveLogGap(positive: number[]): number {
+	const axisFirst = Math.log10(positive[0]);
+	const axisLast = Math.log10(positive[positive.length - 1]);
+	const gap =
+		positive.length > 1
+			? (axisLast - axisFirst) / (positive.length - 1)
+			: Math.log10(FALLBACK_LOG_RATIO);
+	return gap > 0 ? gap : Math.log10(FALLBACK_LOG_RATIO);
+}
+
+/**
+ * Plain log10, with the boundaries a logarithm has no answer for — zero and
+ * below — pinned one bucket beneath the smallest positive one. They keep their
+ * own rows, ticks and labels; only their height is synthetic, and it is the
+ * height of a bucket rather than the decade a symmetric log would spend on them.
+ *
+ * Several of them share that one edge, which squashes them together: a layout
+ * that straddles zero wants `Symlog`. This is the scale for the one non-positive
+ * boundary an explicit-bounds histogram routinely carries — its zero bucket.
+ */
+function createFloorLogTransform(positive: number[]): AxisTransform {
+	const floor = Math.log10(positive[0]) - resolveLogGap(positive);
+	return {
+		toAxisValue: (value) => (value > 0 ? Math.log10(value) : floor),
+		toBucketValue: (axisValue) => 10 ** axisValue,
+	};
+}
+
+function resolveAxisTransform(
+	bounds: number[],
+	scale: HeatmapAxisScale,
+): AxisTransform {
+	if (scale === HeatmapAxisScale.Linear) {
+		return LINEAR_TRANSFORM;
+	}
+	if (scale === HeatmapAxisScale.Symlog) {
+		return resolveSymlogTransform(bounds);
+	}
+	if (canUseLogAxis(bounds)) {
+		return LOG_TRANSFORM;
+	}
+	// A plain log is still a plain log where the boundaries allow one; `Auto`
+	// instead reads the layout and answers with the scale that fits it.
+	if (scale === HeatmapAxisScale.Log) {
+		const positive = bounds.filter((bound) => bound > 0);
+		return positive.length > 0
+			? createFloorLogTransform(positive)
+			: LINEAR_TRANSFORM;
+	}
+	return resolveSymlogTransform(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();
+}
+
+/** Where uPlot switches from a fixed increment to a calendar walk. */
+const MONTH_INCR_SECONDS = 3600 * 24 * 28;
+const YEAR_INCR_SECONDS = 3600 * 24 * 365;
+
+/** Shifts a timestamp into the axis timezone, as uPlot's `tzDate` does: the
+ *  returned date's *local* fields read as that timezone's wall clock. */
+type ToAxisDate = (timestamp: number) => Date;
+
+const BROWSER_DATE: ToAxisDate = (timestamp) => new Date(timestamp * 1e3);
+
+/**
+ * Real epoch seconds of the midnight at or before `timestamp`, in the axis
+ * timezone. The browser's own offset cancels: it is inside the shifted date's
+ * fields and inside the correction.
+ */
+function resolveDayOrigin(timestamp: number, toDate: ToAxisDate): number {
+	const shifted = toDate(timestamp);
+	const midnight = new Date(
+		shifted.getFullYear(),
+		shifted.getMonth(),
+		shifted.getDate(),
+	);
+	const correction = Math.floor(timestamp) - Math.floor(shifted.getTime() / 1e3);
+	return Math.floor(midnight.getTime() / 1e3) + correction;
+}
+
+function fromAxisDate(wall: Date, toDate: ToAxisDate): number {
+	const wallTs = Math.floor(wall.getTime() / 1e3);
+	return wallTs + (wallTs - Math.floor(toDate(wallTs).getTime() / 1e3));
+}
+
+function snapToColumnEdge(value: number, phase: number, width: number): number {
+	return phase + Math.round((value - phase) / width) * width;
+}
+
+/**
+ * Month and year ticks, walked as calendar dates the way uPlot walks them — no
+ * fixed increment expresses a month. Their spacing is uneven to begin with, so
+ * each tick is snapped to its own nearest column edge.
+ */
+function resolveCalendarSplits({
+	incr,
+	min,
+	max,
+	toDate,
+	phase,
+	columnWidth,
+}: {
+	incr: number;
+	min: number;
+	max: number;
+	toDate: ToAxisDate;
+	phase: number;
+	columnWidth: number;
+}): number[] {
+	const isYear = incr >= YEAR_INCR_SECONDS;
+	const monthsPerTick = Math.max(
+		1,
+		isYear
+			? Math.round(incr / YEAR_INCR_SECONDS) * 12
+			: Math.round(incr / MONTH_INCR_SECONDS),
+	);
+
+	const start = toDate(min);
+	const baseYear = start.getFullYear();
+	const baseMonth = isYear ? 0 : start.getMonth();
+
+	const splits: number[] = [];
+	for (let index = 0; ; index += 1) {
+		const wall = new Date(baseYear, baseMonth + monthsPerTick * index, 1);
+		const value = snapToColumnEdge(
+			fromAxisDate(wall, toDate),
+			phase,
+			columnWidth,
+		);
+		if (value > max) {
+			break;
+		}
+		if (value >= min && value !== splits[splits.length - 1]) {
+			splits.push(value);
+		}
+	}
+	return splits;
+}
+
+/**
+ * Time ticks placed on column edges, so a vertical grid line falls in the gap
+ * between two cells instead of through one. uPlot's increment is rounded up to a
+ * whole number of columns, and the sequence starts at the column edge nearest
+ * the timezone's midnight — the closest the grid can get to the ticks uPlot
+ * would have drawn. Where midnight is itself an edge, they are those ticks.
+ */
+export function resolveColumnAlignedSplits({
+	anchor,
+	step,
+	incr,
+	min,
+	max,
+	toDate = BROWSER_DATE,
+}: {
+	/** Any column start: every edge sits at `anchor + n * step`. */
+	anchor: number;
+	/** Column width in seconds. */
+	step: number;
+	/** Increment uPlot picked for the axis, in seconds. */
+	incr: number;
+	min: number;
+	max: number;
+	toDate?: ToAxisDate;
+}): number[] {
+	if (!(incr > 0) || !(max > min)) {
+		return [];
+	}
+
+	const columnWidth = step > 0 ? step : incr;
+	const phase = step > 0 ? ((anchor % step) + step) % step : 0;
+
+	if (incr >= MONTH_INCR_SECONDS) {
+		return resolveCalendarSplits({
+			incr,
+			min,
+			max,
+			toDate,
+			phase,
+			columnWidth,
+		});
+	}
+
+	const tickIncr = Math.ceil(incr / columnWidth) * columnWidth;
+	const origin = snapToColumnEdge(
+		resolveDayOrigin(min, toDate),
+		phase,
+		columnWidth,
+	);
+
+	const splits: number[] = [];
+	for (let index = Math.ceil((min - origin) / tickIncr); ; index += 1) {
+		const value = origin + index * tickIncr;
+		if (value > max) {
+			break;
+		}
+		splits.push(value);
+	}
+	return splits;
+}

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 +1,178 @@
+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;
+			}
+			const count =
+				(u.data[row + 1] as Array<number | null> | undefined)?.[column] ?? null;
+			// The count is part of the identity: a refetch swaps the data under a
+			// stationary cursor, and the cell it points at then means something else.
+			if (
+				hovered?.row === row &&
+				hovered?.column === column &&
+				hovered?.count === count
+			) {
+				return;
+			}
+
+			hovered = { row, column, count };
+			// 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;
+			hatchPattern = null;
+			cachedData = null;
+			cachedResolver = null;
+			// A rebuilt plot starts with no cursor, so a listener still holding this
+			// cell would keep drawing a hover that no longer exists.
+			if (hovered !== null) {
+				hovered = null;
+				onHoverChange?.(null);
+			}
+		},
+	};
+}

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

@@ -0,0 +1,122 @@
+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';
+	// The plot area's edge, as the canvas clip is to the cells: a cell at either end
+	// runs past the axis when its bucket or its time slice is only partly in view,
+	// and the highlight would otherwise be drawn over the axis and the panel.
+	container.style.overflow = 'hidden';
+	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 +1,122 @@
+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 {
+	/** Whichever of the three below the boundaries admit: log when they are all
+	 *  positive, symmetric log when they cross zero, linear when they are all
+	 *  zero. The choice is a property of the data, so this is the default. */
+	Auto = 'auto',
+	Linear = 'linear',
+	/** Plain log10. A boundary at or below zero has no logarithm, so it is pinned
+	 *  one bucket below the smallest positive one — see `resolveHeatmapYAxis`. */
+	Log = 'log',
+	/** Linear within ±the smallest non-zero boundary, logarithmic beyond,
+	 *  mirrored across zero. The scale for boundaries that straddle zero. */
+	Symlog = 'symlog',
+}
+
+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 +1,346 @@
+import { useCallback, useEffect, 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;
+
+/** Row, column and count together: a refetch changes what the cell under a
+ *  stationary cursor means, while the row and column stay put. */
+function isSameCell(a: HeatmapCell | null, b: HeatmapCell | null): boolean {
+	if (a === null || b === null) {
+		return a === b;
+	}
+	return a.row === b.row && a.column === b.column && a.count === b.count;
+}
+
+/**
+ * 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.Auto,
+		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 hoverFrameRef = useRef<number | 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.
+	//
+	// The plot reports the cell from inside its own render path, which React can be
+	// driving — a resize or a data swap runs the plot's hooks during a commit, and a
+	// rebuilt plot re-reports the cell the cursor is still sitting on. Committing to
+	// state there nests an update inside the commit that caused it, so the two feed
+	// each other until React gives up at its depth limit. The frame takes the update
+	// out of that chain; the equality check drops a report that carries nothing new.
+	const handleHoverChange = useCallback((cell: HeatmapCell | null): void => {
+		hoveredCellRef.current = cell;
+		if (hoverFrameRef.current !== null) {
+			return;
+		}
+		hoverFrameRef.current = requestAnimationFrame(() => {
+			hoverFrameRef.current = null;
+			setHoveredCell((previous) =>
+				isSameCell(previous, hoveredCellRef.current)
+					? previous
+					: hoveredCellRef.current,
+			);
+		});
+	}, []);
+
+	useEffect(
+		() => (): void => {
+			if (hoverFrameRef.current !== null) {
+				cancelAnimationFrame(hoverFrameRef.current);
+			}
+		},
+		[],
+	);
+
+	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 +1,204 @@
+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,
+	resolveColumnAlignedSplits,
+} 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,
+		// Grid lines are drawn on the ticks, so the ticks go on the cell edges.
+		splits: (_self, _axisIdx, scaleMin, scaleMax, foundIncr): number[] =>
+			resolveColumnAlignedSplits({
+				anchor: grid.timestamps[0] ?? 0,
+				step: grid.step,
+				incr: foundIncr,
+				min: scaleMin,
+				max: scaleMax,
+				toDate: tzDate,
+			}),
+	});
+
+	// 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 +87,61 @@ 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 auto: the boundaries pick between log, symmetric log and
+	 *  linear. */
+	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