feat(dashboards): allow formulas and trace operators in top list panels

Panel kinds declare which builder fields to keep equal across queries. A query
added or switched to another signal takes the others' values, since a signal
switch reloads its own.

docs/api/openapi.yml

@@ -3425,6 +3425,13 @@ components:
           nullable: true
           type: number
       type: object
+    DashboardtypesAxisScale:
+      enum:
+      - auto
+      - linear
+      - log
+      - symlog
+      type: string
     DashboardtypesBarChartPanelSpec:
       properties:
         axes:
@@ -4167,9 +4174,11 @@ components:
           signoz/ListPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpec'
           signoz/NumberPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesNumberPanelSpec'
           signoz/PieChartPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesPieChartPanelSpec'
+          signoz/ScatterPlotPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpec'
           signoz/TablePanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTablePanelSpec'
           signoz/TextPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTextPanelSpec'
           signoz/TimeSeriesPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTimeSeriesPanelSpec'
+          signoz/TopListPanel: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTopListPanelSpec'
         propertyName: kind
       oneOf:
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTimeSeriesPanelSpec'
@@ -4182,6 +4191,8 @@ components:
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpec'
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTextPanelSpec'
       - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpec'
+      - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpec'
+      - $ref: '#/components/schemas/DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTopListPanelSpec'
       type: object
     DashboardtypesPanelPluginKind:
       enum:
@@ -4195,6 +4206,8 @@ components:
       - signoz/ListPanel
       - signoz/TextPanel
       - signoz/HeatmapPanel
+      - signoz/ScatterPlotPanel
+      - signoz/TopListPanel
       type: string
     DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesAreaChartPanelSpec:
       properties:
@@ -4280,6 +4293,18 @@ components:
       - kind
       - spec
       type: object
+    DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpec:
+      properties:
+        kind:
+          enum:
+          - signoz/ScatterPlotPanel
+          type: string
+        spec:
+          $ref: '#/components/schemas/DashboardtypesScatterPlotPanelSpec'
+      required:
+      - kind
+      - spec
+      type: object
     DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTablePanelSpec:
       properties:
         kind:
@@ -4316,6 +4341,18 @@ components:
       - kind
       - spec
       type: object
+    DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTopListPanelSpec:
+      properties:
+        kind:
+          enum:
+          - signoz/TopListPanel
+          type: string
+        spec:
+          $ref: '#/components/schemas/DashboardtypesTopListPanelSpec'
+      required:
+      - kind
+      - spec
+      type: object
     DashboardtypesPanelSpec:
       properties:
         display:
@@ -4359,6 +4396,16 @@ components:
         visualization:
           $ref: '#/components/schemas/DashboardtypesBasicVisualization'
       type: object
+    DashboardtypesPointDiameter:
+      maximum: 40
+      minimum: 2
+      nullable: true
+      type: integer
+    DashboardtypesPointOpacity:
+      maximum: 1
+      minimum: 0.1
+      nullable: true
+      type: number
     DashboardtypesPostableDashboardV2:
       properties:
         generateName:
@@ -4532,6 +4579,87 @@ components:
       required:
       - queryValue
       type: object
+    DashboardtypesScatterPlotAxes:
+      properties:
+        x:
+          $ref: '#/components/schemas/DashboardtypesScatterPlotAxis'
+        "y":
+          $ref: '#/components/schemas/DashboardtypesScatterPlotAxis'
+      type: object
+    DashboardtypesScatterPlotAxis:
+      properties:
+        label:
+          description: Axis title. Empty draws none.
+          type: string
+        scale:
+          $ref: '#/components/schemas/DashboardtypesAxisScale'
+        softMax:
+          nullable: true
+          type: number
+        softMin:
+          nullable: true
+          type: number
+      type: object
+    DashboardtypesScatterPlotChartAppearance:
+      properties:
+        points:
+          $ref: '#/components/schemas/DashboardtypesScatterPlotPoints'
+      type: object
+    DashboardtypesScatterPlotDimensions:
+      properties:
+        colorBy:
+          description: Group-by label names (e.g. k8s.namespace.name) whose combined
+            values colour dots and drive the legend. Empty colours by every group-by
+            label.
+          items:
+            type: string
+          nullable: true
+          type: array
+        sizeBy:
+          description: Value column key that scales dot size. Empty draws every dot
+            at the default size.
+          type: string
+        x:
+          description: Value column key (queryName, or queryName.expression for a
+            multi-aggregation query) plotted on the x axis. Empty uses the first value
+            column.
+          type: string
+        "y":
+          description: Value column key plotted on the y axis. Empty uses the second
+            value column.
+          type: string
+      type: object
+    DashboardtypesScatterPlotPanelSpec:
+      properties:
+        axes:
+          $ref: '#/components/schemas/DashboardtypesScatterPlotAxes'
+        chartAppearance:
+          $ref: '#/components/schemas/DashboardtypesScatterPlotChartAppearance'
+        dimensions:
+          $ref: '#/components/schemas/DashboardtypesScatterPlotDimensions'
+        formatting:
+          $ref: '#/components/schemas/DashboardtypesTableFormatting'
+        legend:
+          $ref: '#/components/schemas/DashboardtypesLegend'
+        thresholds:
+          items:
+            $ref: '#/components/schemas/DashboardtypesThresholdWithLabel'
+          nullable: true
+          type: array
+        visualization:
+          $ref: '#/components/schemas/DashboardtypesBasicVisualization'
+      type: object
+    DashboardtypesScatterPlotPoints:
+      properties:
+        maxSize:
+          $ref: '#/components/schemas/DashboardtypesPointDiameter'
+        minSize:
+          $ref: '#/components/schemas/DashboardtypesPointDiameter'
+        opacity:
+          $ref: '#/components/schemas/DashboardtypesPointOpacity'
+        size:
+          $ref: '#/components/schemas/DashboardtypesPointDiameter'
+      type: object
     DashboardtypesSource:
       enum:
       - user
@@ -4716,6 +4844,18 @@ components:
         timePreference:
           $ref: '#/components/schemas/DashboardtypesTimePreference'
       type: object
+    DashboardtypesTopListPanelSpec:
+      properties:
+        formatting:
+          $ref: '#/components/schemas/DashboardtypesPanelFormatting'
+        thresholds:
+          items:
+            $ref: '#/components/schemas/DashboardtypesComparisonThreshold'
+          nullable: true
+          type: array
+        visualization:
+          $ref: '#/components/schemas/DashboardtypesBasicVisualization'
+      type: object
     DashboardtypesUpdatableDashboardV2:
       properties:
         image:

frontend/__mocks__/uplotMock.ts

@@ -57,6 +57,7 @@ const mockPaths = {
 const mockTzDate = jest.fn(
 	(date: Date, _timezone: string) => new Date(date.getTime()),
 );
+const mockOrient = jest.fn();
 
 // Mock uPlot constructor - this needs to be a proper constructor function
 function MockUPlot(
@@ -70,6 +71,7 @@ function MockUPlot(
 // Add static methods to the constructor
 MockUPlot.tzDate = mockTzDate;
 MockUPlot.paths = mockPaths;
+MockUPlot.orient = mockOrient;
 // Pinned so canvas-space maths in draw hooks is deterministic under jsdom.
 MockUPlot.pxRatio = 1;
 

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

@@ -4372,6 +4372,12 @@ export interface DashboardtypesAreaChartPanelSpecDTO {
 	visualization?: DashboardtypesAreaChartVisualizationDTO;
 }
 
+export enum DashboardtypesAxisScaleDTO {
+	auto = 'auto',
+	linear = 'linear',
+	log = 'log',
+	symlog = 'symlog',
+}
 export interface DashboardtypesBarChartVisualizationDTO {
 	/**
 	 * @type boolean
@@ -5372,6 +5378,101 @@ export interface DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDa
 	spec: DashboardtypesHeatmapPanelSpecDTO;
 }
 
+export enum DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpecDTOKind {
+	'signoz/ScatterPlotPanel' = 'signoz/ScatterPlotPanel',
+}
+export interface DashboardtypesScatterPlotAxisDTO {
+	/**
+	 * @type string
+	 * @description Axis title. Empty draws none.
+	 */
+	label?: string;
+	scale?: DashboardtypesAxisScaleDTO;
+	/**
+	 * @type number,null
+	 */
+	softMax?: number | null;
+	/**
+	 * @type number,null
+	 */
+	softMin?: number | null;
+}
+
+export interface DashboardtypesScatterPlotAxesDTO {
+	x?: DashboardtypesScatterPlotAxisDTO;
+	y?: DashboardtypesScatterPlotAxisDTO;
+}
+
+/**
+ * @minimum 2
+ * @maximum 40
+ * @nullable
+ */
+export type DashboardtypesPointDiameterDTO = number | null;
+
+/**
+ * @minimum 0.1
+ * @maximum 1
+ * @nullable
+ */
+export type DashboardtypesPointOpacityDTO = number | null;
+
+export interface DashboardtypesScatterPlotPointsDTO {
+	maxSize?: DashboardtypesPointDiameterDTO | null;
+	minSize?: DashboardtypesPointDiameterDTO | null;
+	opacity?: DashboardtypesPointOpacityDTO | null;
+	size?: DashboardtypesPointDiameterDTO | null;
+}
+
+export interface DashboardtypesScatterPlotChartAppearanceDTO {
+	points?: DashboardtypesScatterPlotPointsDTO;
+}
+
+export interface DashboardtypesScatterPlotDimensionsDTO {
+	/**
+	 * @type array,null
+	 * @description Group-by label names (e.g. k8s.namespace.name) whose combined values colour dots and drive the legend. Empty colours by every group-by label.
+	 */
+	colorBy?: string[] | null;
+	/**
+	 * @type string
+	 * @description Value column key that scales dot size. Empty draws every dot at the default size.
+	 */
+	sizeBy?: string;
+	/**
+	 * @type string
+	 * @description Value column key (queryName, or queryName.expression for a multi-aggregation query) plotted on the x axis. Empty uses the first value column.
+	 */
+	x?: string;
+	/**
+	 * @type string
+	 * @description Value column key plotted on the y axis. Empty uses the second value column.
+	 */
+	y?: string;
+}
+
+export interface DashboardtypesScatterPlotPanelSpecDTO {
+	axes?: DashboardtypesScatterPlotAxesDTO;
+	chartAppearance?: DashboardtypesScatterPlotChartAppearanceDTO;
+	dimensions?: DashboardtypesScatterPlotDimensionsDTO;
+	formatting?: DashboardtypesTableFormattingDTO;
+	legend?: DashboardtypesLegendDTO;
+	/**
+	 * @type array,null
+	 */
+	thresholds?: DashboardtypesThresholdWithLabelDTO[] | null;
+	visualization?: DashboardtypesBasicVisualizationDTO;
+}
+
+export interface DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpecDTO {
+	/**
+	 * @enum signoz/ScatterPlotPanel
+	 * @type string
+	 */
+	kind: DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpecDTOKind;
+	spec: DashboardtypesScatterPlotPanelSpecDTO;
+}
+
 export type DashboardtypesPanelPluginDTO =
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTimeSeriesPanelSpecDTO
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesBarChartPanelSpecDTO
@@ -5382,7 +5483,8 @@ export type DashboardtypesPanelPluginDTO =
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHistogramPanelSpecDTO
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesListPanelSpecDTO
 	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesTextPanelSpecDTO
-	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpecDTO;
+	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesHeatmapPanelSpecDTO
+	| DashboardtypesPanelPluginVariantGithubComSigNozSignozPkgTypesDashboardtypesScatterPlotPanelSpecDTO;
 
 export enum Querybuildertypesv5RequestTypeDTO {
 	scalar = 'scalar',
@@ -6309,6 +6411,7 @@ export enum DashboardtypesPanelPluginKindDTO {
 	'signoz/ListPanel' = 'signoz/ListPanel',
 	'signoz/TextPanel' = 'signoz/TextPanel',
 	'signoz/HeatmapPanel' = 'signoz/HeatmapPanel',
+	'signoz/ScatterPlotPanel' = 'signoz/ScatterPlotPanel',
 }
 /**
  * @nullable

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

@@ -21,6 +21,7 @@ import { DataSource, ReduceOperators } from 'types/common/queryBuilder';
 
 import {
 	convertBuilderQueriesToV5,
+	mapPanelTypeToRequestType,
 	prepareQueryRangePayloadV5,
 } from './prepareQueryRangePayloadV5';
 
@@ -904,6 +905,12 @@ describe('prepareQueryRangePayloadV5', () => {
 	});
 });
 
+describe('mapPanelTypeToRequestType', () => {
+	it('sends a scatter plot as scalar, like a table', () => {
+		expect(mapPanelTypeToRequestType(PANEL_TYPES.SCATTER)).toBe('scalar');
+	});
+});
+
 describe('convertBuilderQueriesToV5 having normalization', () => {
 	const buildSpec = (having: unknown): MetricBuilderQuery => {
 		const [envelope] = convertBuilderQueriesToV5(

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

@@ -51,6 +51,7 @@ export function mapPanelTypeToRequestType(panelType: PANEL_TYPES): RequestType {
 		case PANEL_TYPES.BAR:
 			return 'time_series';
 		case PANEL_TYPES.TABLE:
+		case PANEL_TYPES.SCATTER:
 		case PANEL_TYPES.PIE:
 		case PANEL_TYPES.VALUE:
 			return 'scalar';
@@ -278,6 +279,7 @@ export function createAggregation(
 		queryData.dataSource === DataSource.METRICS &&
 		panelType &&
 		(panelType === PANEL_TYPES.TABLE ||
+			panelType === PANEL_TYPES.SCATTER ||
 			panelType === PANEL_TYPES.PIE ||
 			panelType === PANEL_TYPES.VALUE);
 

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

@@ -518,7 +518,10 @@ function QueryAddOns({
 								type="number"
 								onChange={handleChangeLimit}
 								initialValue={query?.limit ?? undefined}
-								placeholder="Enter limit"
+								placeholder={
+									resolvedFields.get(QueryBuilderField.Limit)?.placeholder ??
+									'Enter limit'
+								}
 								onClose={(): void => handleRemoveView(QueryBuilderField.Limit)}
 								closeIcon={<ChevronUp size={16} />}
 							/>

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

@@ -43,7 +43,9 @@ function QueryAggregationOptions({
 
 		if (
 			isNonMetricSource &&
-			(panelType === PANEL_TYPES.TABLE || panelType === PANEL_TYPES.PIE)
+			(panelType === PANEL_TYPES.TABLE ||
+				panelType === PANEL_TYPES.SCATTER ||
+				panelType === PANEL_TYPES.PIE)
 		) {
 			return { hidden: true, disabled: false, reason: undefined };
 		}

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

@@ -95,6 +95,7 @@ export const QueryV2 = forwardRef(function QueryV2(
 		() =>
 			dataSource === DataSource.METRICS &&
 			(panelType === PANEL_TYPES.TABLE ||
+				panelType === PANEL_TYPES.SCATTER ||
 				panelType === PANEL_TYPES.PIE ||
 				panelType === PANEL_TYPES.VALUE),
 		[dataSource, panelType],

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

@@ -9,6 +9,7 @@ import {
 } from 'tests/test-utils';
 import { DataSource, ReduceOperators } from 'types/common/queryBuilder';
 
+import { QueryBuilderField } from '../queryBuilderFields.types';
 import QueryAddOns from '../QueryV2/QueryAddOns/QueryAddOns';
 
 // Mocks: only what is required for this component to render and for us to assert handler calls
@@ -169,6 +170,33 @@ describe('QueryAddOns', () => {
 		expect(mockHandleChangeQueryData).toHaveBeenCalledWith('limit', 10);
 	});
 
+	it('shows the configured limit placeholder', () => {
+		render(
+			<QueryAddOns
+				query={baseQuery()}
+				version="v5"
+				isRawQuery={false}
+				showReduceTo={false}
+				panelType={PANEL_TYPES.SCATTER}
+				index={0}
+				fieldsConfig={{
+					[QueryBuilderField.Limit]: {
+						state: 'defaulted',
+						placeholder: 'Default 10,000',
+					},
+				}}
+				isForTraceOperator={false}
+			/>,
+		);
+
+		fireEvent.click(screen.getByTestId('query-add-on-limit'));
+
+		expect(screen.getByTestId('input-Limit')).toHaveAttribute(
+			'placeholder',
+			'Default 10,000',
+		);
+	});
+
 	it('auto-opens Order By and Limit when present in query', () => {
 		const query = baseQuery({
 			orderBy: [{ columnName: 'duration', order: 'desc' }],

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

@@ -0,0 +1,45 @@
+import { initialQueriesMap, PANEL_TYPES } from 'constants/queryBuilder';
+import { render, screen } from 'tests/test-utils';
+import type { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
+import { DataSource } from 'types/common/queryBuilder';
+
+import QueryAggregationOptions from '../QueryV2/QueryAggregation/QueryAggregation';
+
+jest.mock('../QueryV2/QueryAggregation/QueryAggregationSelect', () => ({
+	__esModule: true,
+	default: (): null => null,
+}));
+
+const queryData = initialQueriesMap.traces.builder
+	.queryData[0] as IBuilderQuery;
+
+function renderFor(panelType: PANEL_TYPES, dataSource: DataSource): void {
+	render(
+		<QueryAggregationOptions
+			dataSource={dataSource}
+			panelType={panelType}
+			onAggregationIntervalChange={jest.fn()}
+			queryData={queryData}
+		/>,
+	);
+}
+
+describe('QueryAggregationOptions step interval', () => {
+	it.each([PANEL_TYPES.TABLE, PANEL_TYPES.SCATTER, PANEL_TYPES.PIE])(
+		'is hidden for a %s panel over traces, which reduces the whole window',
+		(panelType) => {
+			renderFor(panelType, DataSource.TRACES);
+			expect(screen.queryByText('every')).not.toBeInTheDocument();
+		},
+	);
+
+	it('stays for a scatter plot over metrics, where it sets the series step', () => {
+		renderFor(PANEL_TYPES.SCATTER, DataSource.METRICS);
+		expect(screen.getByText('every')).toBeInTheDocument();
+	});
+
+	it('stays for a time series over traces', () => {
+		renderFor(PANEL_TYPES.TIME_SERIES, DataSource.TRACES);
+		expect(screen.getByText('every')).toBeInTheDocument();
+	});
+});

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

@@ -57,6 +57,19 @@ describe('resolveQueryBuilderField', () => {
 		expect(resolved.hidden).toBe(false);
 	});
 
+	it('keeps a defaulted field as is, carrying its placeholder', () => {
+		const resolved = resolveQueryBuilderField(QueryBuilderField.Limit, {
+			[QueryBuilderField.Limit]: { state: 'defaulted', placeholder: 'Default 10' },
+		});
+
+		expect(resolved).toStrictEqual({
+			hidden: false,
+			disabled: false,
+			pinned: false,
+			placeholder: 'Default 10',
+		});
+	});
+
 	it('only ever resolves one state at a time', () => {
 		const resolved = resolveQueryBuilderField(QueryBuilderField.Limit, {
 			[QueryBuilderField.Limit]: { state: 'disabled', reason: 'why' },

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

@@ -22,8 +22,12 @@ export enum QueryBuilderField {
 	AdditionalQueries = 'additional_queries',
 }
 
-/** `reason` is required on `disabled`: an inert control the user can see has to explain itself. */
+/**
+ * `reason` is required on `disabled`: an inert control the user can see has to explain itself.
+ * `defaulted` leaves the field as is; its placeholder names the value an empty field falls back to.
+ */
 export type QueryBuilderFieldRule =
+	| { state: 'defaulted'; placeholder: string }
 	| { state: 'hidden' }
 	| { state: 'disabled'; reason: string }
 	| { state: 'pinned' };

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

@@ -10,6 +10,7 @@ export interface ResolvedQueryBuilderField {
 	reason?: string;
 	/** Rendered open, not dismissable, and kept out of the add-on toggle bar. */
 	pinned: boolean;
+	placeholder?: string;
 }
 
 const AVAILABLE: ResolvedQueryBuilderField = {
@@ -20,6 +21,8 @@ const AVAILABLE: ResolvedQueryBuilderField = {
 
 function fromRule(rule: QueryBuilderFieldRule): ResolvedQueryBuilderField {
 	switch (rule.state) {
+		case 'defaulted':
+			return { ...AVAILABLE, placeholder: rule.placeholder };
 		case 'hidden':
 			return { hidden: true, disabled: false, pinned: false };
 		case 'disabled':

frontend/src/constants/panelTypes.ts

@@ -36,6 +36,7 @@ export const getComponentForPanelType = (
 		[PANEL_TYPES.HEATMAP]: null,
 		// Dashboards v2 renders this kind; nothing reaches the V1 chart map for it.
 		[PANEL_TYPES.TEXT]: null,
+		[PANEL_TYPES.SCATTER]: null,
 		[PANEL_TYPES.EMPTY_WIDGET]: null,
 	};
 

frontend/src/constants/queryBuilder.ts

@@ -337,6 +337,7 @@ export enum PANEL_TYPES {
 	TRACE = 'trace',
 	BAR = 'bar',
 	AREA = 'area',
+	SCATTER = 'scatter',
 	PIE = 'pie',
 	HISTOGRAM = 'histogram',
 	HEATMAP = 'heatmap',

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

@@ -28,6 +28,7 @@ export const PANEL_TYPES_VS_FULL_VIEW_TABLE: PanelTypeAndGraphManagerVisibilityP
 		TRACE: false,
 		BAR: true,
 		AREA: true,
+		SCATTER: false,
 		PIE: false,
 		HISTOGRAM: false,
 		HEATMAP: false,

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

@@ -16,6 +16,7 @@ export const PanelTypeVsPanelWrapper = {
 	[PANEL_TYPES.TRACE]: null,
 	// Dashboards v2 renders this kind; the V1 wrapper map is never asked for it.
 	[PANEL_TYPES.TEXT]: null,
+	[PANEL_TYPES.SCATTER]: null,
 	[PANEL_TYPES.EMPTY_WIDGET]: null,
 	[PANEL_TYPES.PIE]: PiePanelWrapper,
 	[PANEL_TYPES.BAR]: BarPanel,

frontend/src/lib/query/panelTypeDataSourceFormValuesMap.ts

@@ -14,6 +14,7 @@ export type PartialPanelTypes = {
 	[PANEL_TYPES.AREA]: 'area';
 	[PANEL_TYPES.VALUE]: 'value';
 	[PANEL_TYPES.PIE]: 'pie';
+	[PANEL_TYPES.SCATTER]: 'scatter';
 	[PANEL_TYPES.HISTOGRAM]: 'histogram';
 	[PANEL_TYPES.HEATMAP]: 'heatmap';
 };
@@ -149,6 +150,7 @@ export const panelTypeDataSourceFormValuesMap: Record<
 	[PANEL_TYPES.HEATMAP]: bySource(HEATMAP, HEATMAP_METRICS),
 	[PANEL_TYPES.TABLE]: bySource(SERIES, SCALAR_METRICS),
 	[PANEL_TYPES.PIE]: bySource(SERIES, SCALAR_METRICS),
+	[PANEL_TYPES.SCATTER]: bySource(SERIES, SCALAR_METRICS),
 	[PANEL_TYPES.VALUE]: bySource(SINGLE_VALUE, SINGLE_VALUE_METRICS),
 	[PANEL_TYPES.LIST]: bySource(RAW_ROWS, RAW_ROWS_METRICS),
 };

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

@@ -0,0 +1,105 @@
+// Surface matches the shared Tooltip: same tokens, same radius, no shadow.
+// Padding lives on the sections so a footer can reach the container edges.
+.container {
+	// Same inset as the heatmap tooltip.
+	--gutter: 14px;
+
+	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);
+	}
+}
+
+.divider {
+	display: block;
+	width: 100%;
+	height: 1px;
+	background-color: var(--l2-border);
+}
+
+.header {
+	display: flex;
+	align-items: center;
+	gap: var(--spacing-3);
+	padding: var(--spacing-6) var(--gutter);
+}
+
+// Matches the legend row's marker.
+.marker {
+	box-sizing: border-box;
+	width: 12px;
+	height: 12px;
+	border: 1.5px solid;
+	border-radius: var(--radius);
+	flex-shrink: 0;
+}
+
+.title {
+	flex: 1;
+	min-width: 0;
+	font-family: var(--font-mono);
+	font-size: var(--font-size-xs);
+	font-weight: 600;
+	color: var(--text-vanilla-100);
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.status {
+	display: flex;
+	align-items: center;
+	gap: var(--spacing-1);
+	font-size: 11px;
+	color: var(--text-vanilla-400);
+	flex-shrink: 0;
+}
+
+.rows {
+	display: flex;
+	flex-direction: column;
+	gap: var(--spacing-2);
+	padding: var(--spacing-5) var(--gutter);
+}
+
+.row {
+	display: flex;
+	align-items: baseline;
+	justify-content: space-between;
+	gap: var(--spacing-4);
+	font-family: var(--font-mono);
+	font-size: var(--font-size-xs);
+	font-variant-numeric: tabular-nums;
+	color: var(--text-vanilla-100);
+}
+
+// The group values name the point; the channels are what it says.
+.rowMuted {
+	color: var(--text-vanilla-400);
+}
+
+.rowLabel {
+	flex: 1;
+	min-width: 0;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.rowValue {
+	flex: 0 0 auto;
+	max-width: 60%;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}

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

@@ -0,0 +1,114 @@
+import { useMemo } from 'react';
+import cx from 'classnames';
+import { Pin } from '@signozhq/icons';
+
+import { ScatterTooltipProps } from '../types';
+import { buildChannelRows, resolveHoveredPoint } from './scatterTooltipContent';
+
+import Styles from './ScatterTooltip.module.scss';
+
+/**
+ * One point, its channels, then the group values that name it. Purpose-built
+ * rather than composed from the shared `Tooltip`, whose list is one row per
+ * series at a shared x; a scatter point has no such neighbours.
+ */
+export default function ScatterTooltip({
+	uPlotInstance,
+	dataIndexes,
+	seriesIndex,
+	channels,
+	resolvePointLabels,
+	decimalPrecision,
+	isPinned,
+	dismiss,
+	renderTooltipFooter,
+}: ScatterTooltipProps): JSX.Element | null {
+	const point = useMemo(
+		() => resolveHoveredPoint(uPlotInstance, seriesIndex, dataIndexes),
+		[uPlotInstance, seriesIndex, dataIndexes],
+	);
+
+	const rows = useMemo(
+		() => (point ? buildChannelRows(point, channels, decimalPrecision) : []),
+		[point, channels, decimalPrecision],
+	);
+
+	const labels = useMemo(
+		() =>
+			point
+				? (resolvePointLabels?.(point.seriesIndex, point.dataIndex) ?? [])
+				: [],
+		[point, resolvePointLabels],
+	);
+
+	if (!point) {
+		return null;
+	}
+
+	return (
+		<div
+			className={cx(Styles.container, { [Styles.pinned]: isPinned })}
+			data-pinned={isPinned}
+			data-testid="scatter-tooltip"
+		>
+			<div className={Styles.header}>
+				<span
+					className={Styles.marker}
+					style={{ backgroundColor: point.color, borderColor: point.color }}
+				/>
+				<span
+					className={Styles.title}
+					title={point.label}
+					data-testid="scatter-tooltip-title"
+				>
+					{point.label}
+				</span>
+				{isPinned && (
+					<span className={Styles.status} data-testid="scatter-tooltip-status">
+						<Pin size={12} />
+						<span>Pinned</span>
+					</span>
+				)}
+			</div>
+
+			<span className={Styles.divider} />
+
+			<div className={Styles.rows}>
+				{rows.map((row) => (
+					<div
+						key={row.label}
+						className={Styles.row}
+						data-testid="scatter-tooltip-row"
+					>
+						<span className={Styles.rowLabel}>{row.label}</span>
+						<span className={Styles.rowValue}>{row.value}</span>
+					</div>
+				))}
+			</div>
+
+			{labels.length > 0 && (
+				<>
+					<span className={Styles.divider} />
+					<div className={Styles.rows}>
+						{labels.map((label) => (
+							<div
+								key={label.key}
+								className={cx(Styles.row, Styles.rowMuted)}
+								data-testid="scatter-tooltip-label"
+							>
+								<span className={Styles.rowLabel} title={label.key}>
+									{label.key}
+								</span>
+								<span className={Styles.rowValue} title={label.value}>
+									{label.value}
+								</span>
+							</div>
+						))}
+					</div>
+				</>
+			)}
+
+			{renderTooltipFooter?.({ isPinned, dismiss })}
+		</div>
+	);
+}

frontend/src/lib/uPlotV2/components/Tooltip/__tests__/scatterTooltipContent.test.ts

@@ -0,0 +1,107 @@
+import type uPlot from 'uplot';
+
+import {
+	buildChannelRows,
+	resolveHoveredPoint,
+	ScatterHoveredPoint,
+} from '../scatterTooltipContent';
+
+jest.mock('components/Graph/yAxisConfig', () => ({
+	getToolTipValue: jest.fn((value: number | string, unit?: string) =>
+		`${value} ${unit ?? ''}`.trim(),
+	),
+}));
+
+const plot = {
+	data: [
+		null,
+		[
+			[10, 20],
+			[100, 200],
+			[5, null],
+		],
+		[[30], [300]],
+	],
+	series: [
+		{},
+		{ label: 'cart', stroke: '#ff0000' },
+		{ label: 'checkout', stroke: (): string => '#00ff00' },
+	],
+} as unknown as uPlot;
+
+describe('resolveHoveredPoint', () => {
+	it('reads the focused series at its own data index', () => {
+		expect(resolveHoveredPoint(plot, 1, [null, 1, null])).toStrictEqual({
+			seriesIndex: 1,
+			dataIndex: 1,
+			label: 'cart',
+			color: '#ff0000',
+			x: 20,
+			y: 200,
+			size: null,
+		});
+	});
+
+	it('carries the size column when present and resolves function strokes', () => {
+		expect(resolveHoveredPoint(plot, 1, [null, 0, null])?.size).toBe(5);
+		expect(resolveHoveredPoint(plot, 2, [null, null, 0])).toMatchObject({
+			label: 'checkout',
+			color: '#00ff00',
+			size: null,
+		});
+	});
+
+	it('is null without a focused series or an index for it', () => {
+		expect(resolveHoveredPoint(plot, null, [null, 0, null])).toBeNull();
+		expect(resolveHoveredPoint(plot, 0, [0, 0, null])).toBeNull();
+		expect(resolveHoveredPoint(plot, 1, [null, null, null])).toBeNull();
+	});
+});
+
+describe('buildChannelRows', () => {
+	const point: ScatterHoveredPoint = {
+		seriesIndex: 1,
+		dataIndex: 0,
+		label: 'cart',
+		color: '#f00',
+		x: 12,
+		y: 340,
+		size: 7,
+	};
+
+	it('formats x and y with their own units', () => {
+		const rows = buildChannelRows(point, {
+			x: { label: 'Throughput', unit: 'reqps' },
+			y: { label: 'p99', unit: 'ms' },
+		});
+
+		expect(rows).toStrictEqual([
+			{ label: 'Throughput', value: '12 reqps' },
+			{ label: 'p99', value: '340 ms' },
+		]);
+	});
+
+	it('adds the size row only when the channel is mapped and the point has one', () => {
+		const channels = {
+			x: { label: 'x' },
+			y: { label: 'y' },
+			size: { label: 'Errors' },
+		};
+
+		expect(buildChannelRows(point, channels)).toHaveLength(3);
+		expect(buildChannelRows({ ...point, size: null }, channels)).toHaveLength(2);
+	});
+
+	it('leaves out a size row that repeats the x row', () => {
+		const rows = buildChannelRows(
+			{ ...point, size: point.x },
+			{
+				x: { label: 'A.count()' },
+				y: { label: 'p99' },
+				size: { label: 'A.count()' },
+			},
+		);
+
+		expect(rows.map((row) => row.label)).toStrictEqual(['A.count()', 'p99']);
+	});
+});

frontend/src/lib/uPlotV2/components/Tooltip/scatterTooltipContent.ts

@@ -0,0 +1,98 @@
+import { PrecisionOption } from 'components/Graph/types';
+import { getToolTipValue } from 'components/Graph/yAxisConfig';
+import type uPlot from 'uplot';
+
+import type {
+	ScatterChannel,
+	ScatterChannels,
+	ScatterSeriesData,
+} from '../../plugins/ScatterPlugin/types';
+import { resolveSeriesColor } from './utils';
+
+export interface ScatterHoveredPoint {
+	seriesIndex: number;
+	dataIndex: number;
+	label: string;
+	color: string;
+	x: number;
+	y: number;
+	size: number | null;
+}
+
+export interface ScatterTooltipRow {
+	label: string;
+	value: string;
+}
+
+/** The point the cursor resolved to: the focused series' own index into its columns. */
+export function resolveHoveredPoint(
+	u: uPlot,
+	seriesIndex: number | null,
+	dataIndexes: Array<number | null>,
+): ScatterHoveredPoint | null {
+	if (seriesIndex == null || seriesIndex < 1) {
+		return null;
+	}
+	const dataIndex = dataIndexes[seriesIndex];
+	const series = u.series[seriesIndex];
+	const columns = u.data[seriesIndex] as unknown as
+		| ScatterSeriesData
+		| undefined;
+	if (dataIndex == null || !series || !columns) {
+		return null;
+	}
+	const x = columns[0][dataIndex];
+	const y = columns[1][dataIndex];
+	if (x == null || y == null) {
+		return null;
+	}
+	return {
+		seriesIndex,
+		dataIndex,
+		label: String(series.label ?? ''),
+		color: resolveSeriesColor(series.stroke, u, seriesIndex),
+		x,
+		y,
+		size: columns[2]?.[dataIndex] ?? null,
+	};
+}
+
+function formatChannel(
+	value: number,
+	channel: ScatterChannel,
+	decimalPrecision?: PrecisionOption,
+): string {
+	return getToolTipValue(value, channel.unit, decimalPrecision);
+}
+
+export function buildChannelRows(
+	point: ScatterHoveredPoint,
+	channels: ScatterChannels,
+	decimalPrecision?: PrecisionOption,
+): ScatterTooltipRow[] {
+	const rows: ScatterTooltipRow[] = [
+		{
+			label: channels.x.label,
+			value: formatChannel(point.x, channels.x, decimalPrecision),
+		},
+		{
+			label: channels.y.label,
+			value: formatChannel(point.y, channels.y, decimalPrecision),
+		},
+	];
+	if (channels.size && point.size != null) {
+		const sizeRow = {
+			label: channels.size.label,
+			value: formatChannel(point.size, channels.size, decimalPrecision),
+		};
+		// Size bound to the X or Y column would only repeat that row.
+		if (
+			!rows.some(
+				(row) => row.label === sizeRow.label && row.value === sizeRow.value,
+			)
+		) {
+			rows.push(sizeRow);
+		}
+	}
+	return rows;
+}

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

@@ -6,6 +6,10 @@ import uPlot from 'uplot';
 import { UPlotConfigBuilder } from '../config/UPlotConfigBuilder';
 import { LegendItem } from '../config/types';
 import { HeatmapSeries, HeatmapYAxis } from '../plugins/HeatmapPlugin/types';
+import type {
+	ScatterChannels,
+	ScatterPointLabel,
+} from '../plugins/ScatterPlugin/types';
 import { SyncTooltipFilterMode } from '../plugins/TooltipPlugin/types';
 
 /**
@@ -119,6 +123,17 @@ export interface HeatmapTooltipProps
 	groupColor: string;
 }
 
+/** Not part of `TooltipProps`: it describes one point's channels, not a series list. */
+export interface ScatterTooltipProps
+	extends BaseTooltipProps, TooltipRenderArgs {
+	channels: ScatterChannels;
+	/** The group values behind a point, e.g. `service.name` → `cart`. */
+	resolvePointLabels?: (
+		seriesIndex: number,
+		dataIndex: number,
+	) => ScatterPointLabel[];
+}
+
 export type TooltipProps =
 	| TimeSeriesTooltipProps
 	| BarTooltipProps

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

@@ -39,6 +39,16 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 		};
 	}
 
+	/** The axis line reads as the outermost grid line, so it takes the grid's style. */
+	private buildBorderConfig(
+		grid: uPlot.Axis.Grid | undefined,
+	): uPlot.Axis.Border | undefined {
+		if (this.props.showBorder === false || !grid) {
+			return undefined;
+		}
+		return { show: true, stroke: grid.stroke, width: grid.width };
+	}
+
 	/**
 	 * Build ticks configuration
 	 */
@@ -58,32 +68,49 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 	}
 
 	/**
-	 * Build values formatter for X-axis (time)
+	 * Build values formatter for X-axis: time, or a value axis when a unit or
+	 * precision is given (scatter). Neither leaves uPlot's numeric default.
 	 */
 	private buildXAxisValuesFormatter(): uPlot.Axis.Values | undefined {
-		const { isTimeAxis } = this.props;
+		const { isTimeAxis, yAxisUnit, decimalPrecision } = this.props;
 
 		if (isTimeAxis) {
 			return uPlotXAxisValuesFormat as uPlot.Axis.Values;
 		}
 
+		if (yAxisUnit !== undefined || decimalPrecision !== undefined) {
+			return this.buildValueAxisFormatter();
+		}
+
 		return undefined;
 	}
 
 	/**
-	 * Build values formatter for Y-axis (values with units)
+	 * Build values formatter for a value axis (values with units). A split outside
+	 * the scale's range gets no label: uPlot's arcsinh splits always include
+	 * ±threshold, and it would draw that label past the plot's edge.
 	 */
-	private buildYAxisValuesFormatter(): uPlot.Axis.Values {
-		const { yAxisUnit, decimalPrecision } = this.props;
+	private buildValueAxisFormatter(): uPlot.Axis.Values {
+		const { yAxisUnit, decimalPrecision, scaleKey } = this.props;
 
-		return (_, t): string[] =>
-			t.map((v) => {
-				if (v === null || v === undefined || Number.isNaN(v)) {
+		return (u, t): string[] => {
+			const scale = u?.scales?.[scaleKey];
+			const min = scale?.min ?? -Infinity;
+			const max = scale?.max ?? Infinity;
+			return t.map((v) => {
+				if (
+					v === null ||
+					v === undefined ||
+					Number.isNaN(v) ||
+					v < min ||
+					v > max
+				) {
 					return '';
 				}
 				const value = getToolTipValue(v.toString(), yAxisUnit, decimalPrecision);
 				return `${value}`;
 			});
+		};
 	}
 
 	/**
@@ -101,7 +128,7 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 		return scaleKey === 'x'
 			? this.buildXAxisValuesFormatter()
 			: scaleKey === 'y'
-				? this.buildYAxisValuesFormatter()
+				? this.buildValueAxisFormatter()
 				: undefined;
 	}
 
@@ -149,10 +176,12 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 			side = 2, // bottom by default
 			space,
 			splits,
+			filter,
 			gap = 5, // default gap is 5
 		} = this.props;
 
 		const grid = this.buildGridConfig();
+		const border = this.buildBorderConfig(grid);
 		const ticks = this.buildTicksConfig();
 		const values = this.buildValuesFormatter();
 		const size = this.buildSizeCalculator();
@@ -177,6 +206,9 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 		if (ticks) {
 			axisConfig.ticks = ticks;
 		}
+		if (border) {
+			axisConfig.border = border;
+		}
 		if (values) {
 			axisConfig.values = values;
 		}
@@ -189,6 +221,9 @@ export class UPlotAxisBuilder extends ConfigBuilder<AxisProps, Axis> {
 		if (space !== undefined) {
 			axisConfig.space = space;
 		}
+		if (filter) {
+			axisConfig.filter = filter;
+		}
 		if (size) {
 			axisConfig.size = size;
 		}

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

@@ -19,6 +19,7 @@ import {
 	ConfigBuilder,
 	ConfigBuilderProps,
 	LegendItem,
+	PlotMode,
 	SelectionPreferencesSource,
 	StackMode,
 } from './types';
@@ -65,6 +66,8 @@ export class UPlotConfigBuilder extends ConfigBuilder<
 
 	private stackMode: StackMode = StackMode.None;
 
+	private mode: PlotMode = PlotMode.Aligned;
+
 	private cursor: Cursor | undefined;
 
 	private hooks: Hooks.Arrays = {};
@@ -160,6 +163,15 @@ export class UPlotConfigBuilder extends ConfigBuilder<
 		return this.stackMode;
 	}
 
+	/** Faceted series carry their own x column each; see `SeriesProps.facets`. */
+	setMode(mode: PlotMode): void {
+		this.mode = mode;
+	}
+
+	getMode(): PlotMode {
+		return this.mode;
+	}
+
 	/**
 	 * Add or merge a scale configuration
 	 */
@@ -512,6 +524,10 @@ export class UPlotConfigBuilder extends ConfigBuilder<
 			{} as Record<string, uPlot.Scale>,
 		);
 
+		if (this.mode === PlotMode.Faceted) {
+			config.mode = this.mode as number as uPlot.Mode;
+		}
+
 		config.hooks = this.hooks;
 		config.select = this.select;
 

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

@@ -99,6 +99,7 @@ export class UPlotScaleBuilder extends ConfigBuilder<
 			time,
 			distr,
 			logBase,
+			asinhThreshold: this.props.asinhThreshold,
 		});
 
 		const { rangeConfig, hardMinOnly, hardMaxOnly, hasFixedRange } =

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

@@ -87,6 +87,8 @@ export class UPlotSeriesBuilder extends ConfigBuilder<
 			lineConfig.fill = finalFillColor;
 		} else if (this.props.drawStyle === DrawStyle.Histogram) {
 			lineConfig.fill = `${finalFillColor}40`;
+		} else if (this.props.drawStyle === DrawStyle.Scatter) {
+			lineConfig.fill = `${finalFillColor}${toAlphaHex(resolveFillOpacity(fillOpacity))}`;
 		} else if (fillMode && fillMode !== FillMode.None) {
 			const resolvedOpacity = resolveFillOpacity(fillOpacity);
 			if (fillMode === FillMode.Solid) {
@@ -122,7 +124,8 @@ export class UPlotSeriesBuilder extends ConfigBuilder<
 			return { paths: pathBuilder };
 		}
 
-		if (drawStyle === DrawStyle.Points) {
+		// Scatter without a `pathBuilder` has nothing to draw its discs with.
+		if (drawStyle === DrawStyle.Points || drawStyle === DrawStyle.Scatter) {
 			return { paths: (): null => null };
 		}
 
@@ -194,6 +197,10 @@ export class UPlotSeriesBuilder extends ConfigBuilder<
 		if (drawStyle === DrawStyle.Points) {
 			return true;
 		}
+		// The discs are the series path; uPlot's own points would double-draw them.
+		if (drawStyle === DrawStyle.Scatter) {
+			return false;
+		}
 		return !!showPoints;
 	}
 
@@ -218,7 +225,7 @@ export class UPlotSeriesBuilder extends ConfigBuilder<
 	}
 
 	getConfig(): ExtendedSeries {
-		const { scaleKey, label, spanGaps, show = true, metric } = this.props;
+		const { scaleKey, label, spanGaps, show = true, metric, facets } = this.props;
 
 		const resolvedLineColor = this.getLineColor();
 
@@ -246,6 +253,7 @@ export class UPlotSeriesBuilder extends ConfigBuilder<
 			...pathConfig,
 			points: Object.keys(pointsConfig).length > 0 ? pointsConfig : undefined,
 			metric,
+			...(facets && { facets }),
 		};
 	}
 }

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

@@ -120,6 +120,35 @@ describe('UPlotAxisBuilder', () => {
 		});
 	});
 
+	it('draws the axis line by default, styled like the grid', () => {
+		const config = new UPlotAxisBuilder(
+			createAxisProps({ isDarkMode: true, grid: { width: 0.5 } }),
+		).getConfig();
+
+		expect(config.border).toStrictEqual({
+			show: true,
+			stroke: config.grid?.stroke,
+			width: 0.5,
+		});
+	});
+
+	it('leaves the axis line off when showBorder is false', () => {
+		expect(
+			new UPlotAxisBuilder(createAxisProps({ showBorder: false })).getConfig(),
+		).not.toHaveProperty('border');
+	});
+
+	it('passes explicit splits and a label filter through to uPlot', () => {
+		const splits = jest.fn();
+		const filter = jest.fn();
+		const config = new UPlotAxisBuilder(
+			createAxisProps({ splits, filter }),
+		).getConfig();
+
+		expect(config.splits).toBe(splits);
+		expect(config.filter).toBe(filter);
+	});
+
 	it('uses provided ticks config when present and falls back to defaults otherwise', () => {
 		const customTicks = { width: 1, show: false };
 		const withTicks = new UPlotAxisBuilder(
@@ -376,3 +405,51 @@ describe('UPlotAxisBuilder', () => {
 		expect(config.values).toBeDefined();
 	});
 });
+
+describe('UPlotAxisBuilder value x axis', () => {
+	it('formats a non-time x axis with its unit', () => {
+		(getToolTipValue as jest.Mock).mockReturnValue('1.2K req/s');
+		const config = new UPlotAxisBuilder(
+			createAxisProps({ scaleKey: 'x', isTimeAxis: false, yAxisUnit: 'reqps' }),
+		).getConfig();
+
+		const values = (config.values as uPlot.Axis.DynamicValues)(
+			{} as uPlot,
+			[1200],
+			0,
+			0,
+			0,
+		);
+
+		expect(values).toStrictEqual(['1.2K req/s']);
+		expect(getToolTipValue).toHaveBeenCalledWith('1200', 'reqps', undefined);
+	});
+
+	it('leaves a non-time x axis to uPlot when nothing says how to format it', () => {
+		const config = new UPlotAxisBuilder(
+			createAxisProps({ scaleKey: 'x', isTimeAxis: false }),
+		).getConfig();
+
+		expect(config.values).toBeUndefined();
+	});
+});
+
+describe('UPlotAxisBuilder out-of-range splits', () => {
+	it('leaves a split the scale cannot place unlabelled', () => {
+		(getToolTipValue as jest.Mock).mockImplementation((v: string) => `${v} ms`);
+		const config = new UPlotAxisBuilder(
+			createAxisProps({ scaleKey: 'y', yAxisUnit: 'ms' }),
+		).getConfig();
+		const u = { scales: { y: { min: 0, max: 1000 } } } as unknown as uPlot;
+
+		const values = (config.values as uPlot.Axis.DynamicValues)(
+			u,
+			[-10, 0, 500, 5000],
+			0,
+			0,
+			0,
+		);
+
+		expect(values).toStrictEqual(['', '0 ms', '500 ms', '']);
+	});
+});

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

@@ -5,7 +5,12 @@ import {
 	STEP_INTERVAL_MULTIPLIER,
 } from '../../constants';
 import type { SeriesProps } from '../types';
-import { DrawStyle, SelectionPreferencesSource, StackMode } from '../types';
+import {
+	DrawStyle,
+	PlotMode,
+	SelectionPreferencesSource,
+	StackMode,
+} from '../types';
 import { UPlotConfigBuilder } from '../UPlotConfigBuilder';
 
 // Mock only the real boundary that hits localStorage
@@ -651,3 +656,15 @@ describe('UPlotConfigBuilder stacking', () => {
 		expect(builder.getConfig().bands).toStrictEqual([{ series: [1, 3] }]);
 	});
 });
+
+describe('UPlotConfigBuilder plot mode', () => {
+	it('leaves mode unset for aligned data and emits 2 when faceted', () => {
+		const aligned = new UPlotConfigBuilder({ id: 'aligned' });
+		expect(aligned.getConfig().mode).toBeUndefined();
+
+		const faceted = new UPlotConfigBuilder({ id: 'faceted' });
+		faceted.setMode(PlotMode.Faceted);
+		expect(faceted.getMode()).toBe(PlotMode.Faceted);
+		expect(faceted.getConfig().mode).toBe(2);
+	});
+});

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

@@ -399,3 +399,39 @@ describe('UPlotSeriesBuilder', () => {
 		expect(builder.getConfig().fill).toBeUndefined();
 	});
 });
+
+describe('UPlotSeriesBuilder scatter', () => {
+	it('draws through the given path builder and hides uPlot points', () => {
+		const pathBuilder = jest.fn();
+		const config = new UPlotSeriesBuilder(
+			createBaseProps({
+				drawStyle: DrawStyle.Scatter,
+				pathBuilder,
+				facets: [{ scale: 'x' }, { scale: 'y' }],
+				lineColor: '#ff0000',
+				fillOpacity: 0.5,
+				lineWidth: 1,
+				pointSize: 8,
+			}),
+		).getConfig();
+
+		expect(config.paths).toBe(pathBuilder);
+		expect(config.facets).toStrictEqual([{ scale: 'x' }, { scale: 'y' }]);
+		expect(config.points?.show).toBe(false);
+		expect(config.points?.size).toBe(8);
+		expect(config.stroke).toBe('#ff0000');
+		expect(config.width).toBe(1);
+		expect(config.fill).toBe('#ff000080');
+	});
+
+	it('draws nothing without a path builder', () => {
+		const config = new UPlotSeriesBuilder(
+			createBaseProps({ drawStyle: DrawStyle.Scatter }),
+		).getConfig();
+
+		expect(
+			(config.paths as uPlot.Series.PathBuilder)({} as uPlot, 1, 0, 0),
+		).toBeNull();
+		expect(config.facets).toBeUndefined();
+	});
+});

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

@@ -78,8 +78,12 @@ 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. */
+	/** Explicit tick positions, replacing uPlot's per-distribution default. */
 	splits?: uPlot.Axis.Splits;
+	/** Which splits get a label, replacing uPlot's per-distribution default. */
+	filter?: uPlot.Axis.Filter;
+	/** Draw the axis line along the plot edge, styled like the grid. Default true. */
+	showBorder?: boolean;
 	/** 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. */
@@ -90,7 +94,8 @@ export interface AxisProps {
 	isDarkMode?: boolean;
 	/** Axis is on a log scale — thins the grid lines to keep dense decades readable. */
 	isLogScale?: boolean;
-	/** Unit the y axis ticks are formatted in (`spec.formatting.unit`). */
+	/** Unit the value ticks are formatted in (`spec.formatting.unit`). Named for the
+	 *  y axis, the only value axis until scatter; a non-time x axis reads it too. */
 	yAxisUnit?: string;
 	/**
 	 * X axis carries timestamps, so its ticks format as dates/times. Declared by the caller
@@ -109,6 +114,15 @@ export interface AxisProps {
 export enum DistributionType {
 	Linear = 'linear',
 	Logarithmic = 'logarithmic',
+	/** arcsinh: linear within ±`asinhThreshold`, logarithmic beyond. Takes zero and
+	 *  negatives, which a plain log cannot place. */
+	SymmetricLog = 'symlog',
+}
+
+/** uPlot's data layout: one shared x per chart, or per-series x/y columns. */
+export enum PlotMode {
+	Aligned = 1,
+	Faceted = 2,
 }
 
 export interface ScaleProps {
@@ -125,6 +139,8 @@ export interface ScaleProps {
 	auto?: boolean;
 	logBase?: uPlot.Scale.LogBase;
 	distribution?: DistributionType;
+	/** Half-width of a `SymmetricLog` scale's linear band around zero. Default 1. */
+	asinhThreshold?: number;
 }
 
 export enum DisconnectedValuesMode {
@@ -146,6 +162,8 @@ export enum DrawStyle {
 	Points = 'points',
 	Bar = 'bar',
 	Histogram = 'histogram',
+	/** Faceted (mode 2) discs at per-series x/y, drawn by the caller's `pathBuilder`. */
+	Scatter = 'scatter',
 }
 
 export enum LineInterpolation {
@@ -229,6 +247,8 @@ export interface SeriesProps extends LineConfig, PointsConfig, BarConfig {
 	isDarkMode?: boolean;
 	stepInterval?: number;
 	metric?: { [key: string]: string };
+	/** Mode 2 only: the scales the series' own x and y columns are read against. */
+	facets?: Series.Facet[];
 }
 
 export interface LegendItem {

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

@@ -0,0 +1,114 @@
+import type uPlot from 'uplot';
+
+import { Quadtree } from '../../../utils/quadtree';
+import {
+	resolveHit,
+	resolvePointDiameter,
+	resolveSizeDomain,
+} from '../geometry';
+import { ScatterHit, ScatterPointSize } from '../types';
+
+const POINT_SIZE: ScatterPointSize = { fixed: 6, min: 4, max: 20 };
+
+const asData = (columns: unknown[]): uPlot.AlignedData =>
+	columns as unknown as uPlot.AlignedData;
+
+describe('resolveSizeDomain', () => {
+	it('spans the size columns of every series, skipping nulls', () => {
+		const data = asData([
+			null,
+			[
+				[1, 2],
+				[1, 2],
+				[10, null],
+			],
+			[[3], [3], [40]],
+		]);
+
+		expect(resolveSizeDomain(data)).toStrictEqual({ min: 10, max: 40 });
+	});
+
+	it('is null when no series carries sizes', () => {
+		expect(resolveSizeDomain(asData([null, [[1], [1]]]))).toBeNull();
+		expect(resolveSizeDomain(asData([null, [[1], [1], [null]]]))).toBeNull();
+	});
+});
+
+describe('resolvePointDiameter', () => {
+	it('uses the fixed diameter without a size or a domain', () => {
+		expect(resolvePointDiameter(null, { min: 0, max: 10 }, POINT_SIZE)).toBe(6);
+		expect(resolvePointDiameter(5, null, POINT_SIZE)).toBe(6);
+	});
+
+	it('maps the domain ends to min and max', () => {
+		const domain = { min: 0, max: 100 };
+		expect(resolvePointDiameter(0, domain, POINT_SIZE)).toBe(4);
+		expect(resolvePointDiameter(100, domain, POINT_SIZE)).toBe(20);
+	});
+
+	it('scales by area, not diameter', () => {
+		const midArea = (4 ** 2 + 20 ** 2) / 2;
+		expect(
+			resolvePointDiameter(50, { min: 0, max: 100 }, POINT_SIZE),
+		).toBeCloseTo(Math.sqrt(midArea));
+	});
+
+	it('clamps values outside the domain', () => {
+		const domain = { min: 10, max: 20 };
+		expect(resolvePointDiameter(-5, domain, POINT_SIZE)).toBe(4);
+		expect(resolvePointDiameter(500, domain, POINT_SIZE)).toBe(20);
+	});
+
+	it('uses the midpoint when every size is the same', () => {
+		expect(resolvePointDiameter(7, { min: 7, max: 7 }, POINT_SIZE)).toBe(12);
+	});
+});
+
+describe('resolveHit', () => {
+	const hit = (
+		seriesIndex: number,
+		dataIndex: number,
+		x: number,
+		y: number,
+		d: number,
+	): ScatterHit => ({ seriesIndex, dataIndex, x, y, w: d, h: d });
+
+	it('returns the disc under the cursor', () => {
+		const tree = new Quadtree<ScatterHit>(0, 0, 100, 100);
+		tree.add(hit(1, 0, 10, 10, 6));
+		tree.add(hit(2, 3, 50, 50, 6));
+
+		expect(resolveHit(tree, 13, 13, 0)).toMatchObject({
+			seriesIndex: 1,
+			dataIndex: 0,
+		});
+		expect(resolveHit(tree, 52, 52, 0)).toMatchObject({
+			seriesIndex: 2,
+			dataIndex: 3,
+		});
+	});
+
+	it('is null when the cursor is off every disc', () => {
+		const tree = new Quadtree<ScatterHit>(0, 0, 100, 100);
+		tree.add(hit(1, 0, 10, 10, 6));
+
+		expect(resolveHit(tree, 30, 30, 0)).toBeNull();
+	});
+
+	it('tolerance widens each disc', () => {
+		const tree = new Quadtree<ScatterHit>(0, 0, 100, 100);
+		tree.add(hit(1, 0, 10, 10, 6));
+
+		expect(resolveHit(tree, 18, 13, 0)).toBeNull();
+		expect(resolveHit(tree, 18, 13, 3)).not.toBeNull();
+	});
+
+	it('prefers the disc whose centre is nearest when they overlap', () => {
+		const tree = new Quadtree<ScatterHit>(0, 0, 100, 100);
+		tree.add(hit(1, 0, 10, 10, 10));
+		tree.add(hit(1, 1, 14, 10, 10));
+
+		expect(resolveHit(tree, 13, 15, 0)?.dataIndex).toBe(0);
+		expect(resolveHit(tree, 21, 15, 0)?.dataIndex).toBe(1);
+	});
+});

frontend/src/lib/uPlotV2/plugins/ScatterPlugin/__tests__/scatterPlugin.test.ts

@@ -0,0 +1,288 @@
+import uPlot from 'uplot';
+
+import { PlotMode } from '../../../config/types';
+import { UPlotConfigBuilder } from '../../../config/UPlotConfigBuilder';
+import {
+	applyScatterPlugin,
+	createScatterPlugin,
+	SCATTER_FACETS,
+} from '../scatterPlugin';
+
+jest.mock('lib/visualization/panels/utils/legendVisibilityUtils', () => ({
+	getStoredSeriesVisibility: jest.fn(),
+}));
+
+/** jsdom has no Path2D; the builder only needs something that takes the calls. */
+class FakePath2D {
+	moveTo = jest.fn();
+	arc = jest.fn();
+}
+
+type OrientCallback = Parameters<typeof uPlot.orient>[2];
+
+interface FakePlotArgs {
+	series: Array<{ xs: number[]; ys: number[]; sizes?: Array<number | null> }>;
+	cursor?: { left: number; top: number };
+	scaleX?: { min: number; max: number };
+	scaleY?: { min: number; max: number };
+}
+
+/**
+ * A 100×100 plot at the canvas origin with identity scales: value 10 draws at
+ * pixel 10 on x, and at 100 − 10 on y (uPlot's y grows downward).
+ */
+function createFakePlot({
+	series,
+	cursor = { left: -1, top: -1 },
+	scaleX = { min: 0, max: 100 },
+	scaleY = { min: 0, max: 100 },
+}: FakePlotArgs): uPlot {
+	const data = [
+		null,
+		...series.map((entry) =>
+			entry.sizes ? [entry.xs, entry.ys, entry.sizes] : [entry.xs, entry.ys],
+		),
+	];
+	return {
+		data,
+		series: [{}, ...series.map((_, index) => ({ label: `s${index + 1}` }))],
+		bbox: { left: 0, top: 0, width: 100, height: 100 },
+		cursor,
+		scales: { x: scaleX, y: scaleY },
+	} as unknown as uPlot;
+}
+
+/** Stands in for `uPlot.orient`: identity x, flipped y, an `arc` that records. */
+function orientWithIdentityScales(
+	u: uPlot,
+	seriesIdx: number,
+	cb: OrientCallback,
+): void {
+	const columns = (u.data as unknown as Array<number[][] | null>)[seriesIdx];
+	if (!columns) {
+		return;
+	}
+	const scaleX = (u.scales as unknown as Record<string, uPlot.Scale>).x;
+	const scaleY = (u.scales as unknown as Record<string, uPlot.Scale>).y;
+	const valToPosX = (value: number): number => value;
+	const valToPosY = (value: number): number => 100 - value;
+	// Real uPlot's `arc` helper forwards to the path; the test counts those calls.
+	const arc = (path: FakePath2D, ...args: number[]): void => {
+		path.arc(...args);
+	};
+	cb(
+		u.series[seriesIdx],
+		columns[0],
+		columns[1],
+		scaleX,
+		scaleY,
+		valToPosX as unknown as uPlot.ValToPos,
+		valToPosY as unknown as uPlot.ValToPos,
+		0,
+		0,
+		100,
+		100,
+		jest.fn() as never,
+		jest.fn() as never,
+		jest.fn() as never,
+		arc as never,
+		jest.fn() as never,
+	);
+}
+
+describe('createScatterPlugin', () => {
+	beforeAll(() => {
+		(globalThis as { Path2D?: unknown }).Path2D = FakePath2D;
+	});
+
+	beforeEach(() => {
+		(uPlot.orient as jest.Mock).mockImplementation(orientWithIdentityScales);
+	});
+
+	afterEach(() => {
+		(uPlot.orient as jest.Mock).mockReset();
+	});
+
+	function drawAll(
+		u: uPlot,
+		plugin: ReturnType<typeof createScatterPlugin>,
+	): void {
+		plugin.hooks.drawClear(u);
+		for (let seriesIdx = 1; seriesIdx < u.series.length; seriesIdx++) {
+			const columns = (u.data as unknown as number[][][])[seriesIdx];
+			plugin.pathBuilder(u, seriesIdx, 0, columns[0].length - 1);
+		}
+	}
+
+	/** Runs the cursor scan the way uPlot does: every data series, in order. */
+	function scan(
+		u: uPlot,
+		plugin: ReturnType<typeof createScatterPlugin>,
+	): Array<number | null> {
+		const dataIdx = plugin.cursor.dataIdx as NonNullable<uPlot.Cursor['dataIdx']>;
+		const indexes: Array<number | null> = [null];
+		for (let seriesIdx = 1; seriesIdx < u.series.length; seriesIdx++) {
+			indexes.push(dataIdx(u, seriesIdx, 0, 0));
+		}
+		return indexes;
+	}
+
+	it('returns one path that strokes and fills the same discs', () => {
+		const plugin = createScatterPlugin();
+		const u = createFakePlot({ series: [{ xs: [10, 20], ys: [10, 20] }] });
+		plugin.hooks.drawClear(u);
+
+		const paths = plugin.pathBuilder(u, 1, 0, 1) as uPlot.Series.Paths;
+
+		expect(paths.stroke).toBeInstanceOf(FakePath2D);
+		expect(paths.fill).toBe(paths.stroke);
+		expect((paths.fill as unknown as FakePath2D).arc).toHaveBeenCalledTimes(2);
+	});
+
+	it('resolves the hovered point to its own series and index', () => {
+		const plugin = createScatterPlugin({
+			pointSize: { fixed: 6, min: 4, max: 20 },
+		});
+		const u = createFakePlot({
+			series: [
+				{ xs: [10, 50], ys: [10, 50] },
+				{ xs: [80], ys: [80] },
+			],
+			// Over the second series' only point: x 80, y drawn at 100 − 80.
+			cursor: { left: 80, top: 20 },
+		});
+		drawAll(u, plugin);
+
+		expect(scan(u, plugin)).toStrictEqual([null, null, 0]);
+		expect(plugin.getHit()).toMatchObject({ seriesIndex: 2, dataIndex: 0 });
+	});
+
+	it('returns null for every series when the cursor is off the plot or off any disc', () => {
+		const plugin = createScatterPlugin();
+		const u = createFakePlot({
+			series: [{ xs: [10], ys: [10] }],
+			cursor: { left: -1, top: -1 },
+		});
+		drawAll(u, plugin);
+
+		expect(scan(u, plugin)).toStrictEqual([null, null]);
+
+		(u.cursor as { left: number; top: number }).left = 50;
+		(u.cursor as { left: number; top: number }).top = 50;
+		expect(scan(u, plugin)).toStrictEqual([null, null]);
+	});
+
+	it('skips points outside the visible scale range', () => {
+		const plugin = createScatterPlugin();
+		const u = createFakePlot({
+			series: [{ xs: [10, 500], ys: [10, 10] }],
+			cursor: { left: 10, top: 90 },
+		});
+		drawAll(u, plugin);
+
+		const paths = plugin.pathBuilder(u, 1, 0, 1) as uPlot.Series.Paths;
+		expect((paths.fill as unknown as FakePath2D).arc).toHaveBeenCalledTimes(1);
+		expect(scan(u, plugin)).toStrictEqual([null, 0]);
+	});
+
+	it('rings the hit disc, in CSS pixels, with a gap around it', () => {
+		const plugin = createScatterPlugin({
+			pointSize: { fixed: 8, min: 4, max: 20 },
+		});
+		const u = createFakePlot({
+			series: [{ xs: [10], ys: [10] }],
+			cursor: { left: 10, top: 90 },
+		});
+		drawAll(u, plugin);
+		scan(u, plugin);
+
+		const bbox = plugin.cursor.points?.bbox;
+		// The 8px disc spans 6..14; the ring sits 3px out and is 2px wide.
+		expect(bbox?.(u, 1)).toStrictEqual({
+			left: 1,
+			top: 81,
+			width: 18,
+			height: 18,
+		});
+		expect(bbox?.(u, 2)).toMatchObject({ width: 0, height: 0 });
+	});
+
+	it('snaps the ring to whole pixels without moving its centre', () => {
+		const plugin = createScatterPlugin({
+			pointSize: { fixed: 7, min: 4, max: 20 },
+		});
+		const u = createFakePlot({
+			series: [{ xs: [10], ys: [10] }],
+			cursor: { left: 10, top: 90 },
+		});
+		drawAll(u, plugin);
+		scan(u, plugin);
+
+		// The 7px disc starts at 6.5, so the ring's edge would land on 1.5.
+		const ring = plugin.cursor.points?.bbox?.(u, 1);
+		expect(ring).toMatchObject({ left: 1, width: 18 });
+		expect((ring?.left ?? 0) + (ring?.width ?? 0) / 2).toBe(10);
+	});
+
+	it('draws the hover marker as an outline in the series colour', () => {
+		const plugin = createScatterPlugin();
+		const u = {
+			series: [{}, { stroke: (): string => '#E5484D' }, { stroke: '#30A46C' }],
+		} as unknown as uPlot;
+		const points = plugin.cursor.points as {
+			fill: (u: uPlot, seriesIdx: number) => string;
+			stroke: (u: uPlot, seriesIdx: number) => string;
+			width: (u: uPlot, seriesIdx: number, size: number) => number;
+		};
+
+		expect(points.fill(u, 1)).toBe('transparent');
+		expect(points.stroke(u, 1)).toBe('#E5484D');
+		expect(points.stroke(u, 2)).toBe('#30A46C');
+		expect(points.width(u, 1, 0)).toBe(2);
+	});
+
+	it('drawClear drops cached paths on data series only', () => {
+		const plugin = createScatterPlugin();
+		const u = createFakePlot({ series: [{ xs: [1], ys: [1] }] });
+		const [xSeries, dataSeries] = u.series as Array<{ _paths?: unknown }>;
+		xSeries._paths = 'x';
+		dataSeries._paths = 'cached';
+
+		plugin.hooks.drawClear(u);
+
+		expect(xSeries._paths).toBe('x');
+		expect(dataSeries._paths).toBeNull();
+	});
+
+	it('focus distance is zero, so the hit series wins focus', () => {
+		const plugin = createScatterPlugin();
+		expect(plugin.cursor.focus?.dist?.({} as uPlot, 1, 0, 0, 0)).toBe(0);
+	});
+});
+
+describe('applyScatterPlugin', () => {
+	it('switches the builder to faceted mode and disables drag selection', () => {
+		const builder = new UPlotConfigBuilder({ id: 'scatter' });
+		const plugin = createScatterPlugin();
+
+		applyScatterPlugin(builder, plugin);
+		const config = builder.getConfig();
+
+		expect(builder.getMode()).toBe(PlotMode.Faceted);
+		expect(config.mode).toBe(2);
+		expect(config.cursor?.drag).toMatchObject({
+			x: false,
+			y: false,
+			setScale: false,
+		});
+		expect(config.hooks?.drawClear).toHaveLength(1);
+		expect(config.hooks?.destroy).toHaveLength(1);
+	});
+
+	it('facets read x and y against the shared scales', () => {
+		expect(SCATTER_FACETS).toStrictEqual([
+			{ scale: 'x', auto: true },
+			{ scale: 'y', auto: true },
+		]);
+	});
+});

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

@@ -0,0 +1,96 @@
+import type uPlot from 'uplot';
+
+import type { Quadtree } from '../../utils/quadtree';
+import type { ScatterHit, ScatterPointSize, ScatterSeriesData } from './types';
+
+export interface SizeDomain {
+	min: number;
+	max: number;
+}
+
+/**
+ * Extent of the size column across every series, so equal values draw equal
+ * discs whichever group they belong to. `null` when nothing carries a size.
+ */
+export function resolveSizeDomain(data: uPlot.AlignedData): SizeDomain | null {
+	let min = Infinity;
+	let max = -Infinity;
+	for (let seriesIndex = 1; seriesIndex < data.length; seriesIndex++) {
+		const sizes = (data[seriesIndex] as unknown as ScatterSeriesData)[2];
+		if (!sizes) {
+			continue;
+		}
+		for (const size of sizes) {
+			if (size == null || !Number.isFinite(size)) {
+				continue;
+			}
+			min = Math.min(min, size);
+			max = Math.max(max, size);
+		}
+	}
+	return min <= max ? { min, max } : null;
+}
+
+/**
+ * Disc diameter for a size value. Area, not diameter, follows the value: a
+ * point worth twice as much should look twice as big.
+ */
+export function resolvePointDiameter(
+	size: number | null | undefined,
+	domain: SizeDomain | null,
+	pointSize: ScatterPointSize,
+): number {
+	if (size == null || domain == null || !Number.isFinite(size)) {
+		return pointSize.fixed;
+	}
+	if (domain.max === domain.min) {
+		return (pointSize.min + pointSize.max) / 2;
+	}
+	const t = Math.min(
+		1,
+		Math.max(0, (size - domain.min) / (domain.max - domain.min)),
+	);
+	const minArea = pointSize.min ** 2;
+	const maxArea = pointSize.max ** 2;
+	return Math.sqrt(minArea + (maxArea - minArea) * t);
+}
+
+/**
+ * Nearest disc under the cursor, or `null`. Overlapping discs resolve to the one
+ * whose centre is closest; `tolerance` widens every disc so thin points stay
+ * hoverable.
+ */
+export function resolveHit(
+	tree: Quadtree<ScatterHit>,
+	cx: number,
+	cy: number,
+	tolerance: number,
+): ScatterHit | null {
+	let best: ScatterHit | null = null;
+	let bestDistance = Infinity;
+
+	tree.get(
+		cx - tolerance,
+		cy - tolerance,
+		tolerance * 2,
+		tolerance * 2,
+		(hit) => {
+			const left = hit.x - tolerance;
+			const top = hit.y - tolerance;
+			const right = hit.x + hit.w + tolerance;
+			const bottom = hit.y + hit.h + tolerance;
+			if (cx < left || cx > right || cy < top || cy > bottom) {
+				return;
+			}
+			const dx = cx - (hit.x + hit.w / 2);
+			const dy = cy - (hit.y + hit.h / 2);
+			const distance = dx * dx + dy * dy;
+			if (distance < bestDistance) {
+				best = hit;
+				bestDistance = distance;
+			}
+		},
+	);
+
+	return best;
+}

frontend/src/lib/uPlotV2/plugins/ScatterPlugin/scatterPlugin.ts

@@ -0,0 +1,234 @@
+import uPlot, { Series } from 'uplot';
+
+import { DEFAULT_FOCUS_PROXIMITY_VALUE } from '../../constants';
+import { PlotMode } from '../../config/types';
+import type { UPlotConfigBuilder } from '../../config/UPlotConfigBuilder';
+import { Quadtree } from '../../utils/quadtree';
+import {
+	resolveHit,
+	resolvePointDiameter,
+	resolveSizeDomain,
+	SizeDomain,
+} from './geometry';
+import {
+	DEFAULT_HOVER_TOLERANCE_PX,
+	DEFAULT_SCATTER_POINT_SIZE,
+	ScatterHit,
+	ScatterPluginOptions,
+	ScatterSeriesData,
+} from './types';
+
+/** Every scatter series reads its own x and y columns against the shared scales. */
+export const SCATTER_FACETS: Series.Facet[] = [
+	{ scale: 'x', auto: true },
+	{ scale: 'y', auto: true },
+];
+
+const HIDDEN_BBOX: uPlot.BBox = { left: -10, top: -10, width: 0, height: 0 };
+
+const TWO_PI = 2 * Math.PI;
+
+/** CSS pixels between a hovered disc and the outline ring drawn around it. */
+const HOVER_RING_GAP_PX = 3;
+const HOVER_RING_WIDTH_PX = 2;
+
+/**
+ * uPlot `ceil`s a cursor point's left/top but not its size, which pulls a ring
+ * up to 1px right and down of the disc. Snapping the edge to a whole pixel and
+ * growing the span by twice the snap keeps the centre exact.
+ */
+function snapToPixel(start: number, length: number): [number, number] {
+	const snapped = Math.floor(start);
+	return [snapped, length + (start - snapped) * 2];
+}
+
+export function getSeriesStroke(u: uPlot, seriesIdx: number): string {
+	const { stroke } = u.series[seriesIdx];
+	const color = typeof stroke === 'function' ? stroke(u, seriesIdx) : stroke;
+	return typeof color === 'string' ? color : '';
+}
+
+/** uPlot caches built paths on the series; the field is internal to it. */
+type SeriesWithPaths = Series & { _paths?: Series.Paths | null };
+
+export interface ScatterPlugin {
+	/** Draws every point of a series as one path and indexes the discs for hover. */
+	pathBuilder: Series.PathBuilder;
+	/** Hover by disc rather than by nearest x: mode 2 has no shared x to scan. */
+	cursor: uPlot.Cursor;
+	hooks: {
+		drawClear: (u: uPlot) => void;
+		destroy: (u: uPlot) => void;
+	};
+	getHit: () => ScatterHit | null;
+}
+
+export function createScatterPlugin({
+	pointSize = DEFAULT_SCATTER_POINT_SIZE,
+	hoverTolerance = DEFAULT_HOVER_TOLERANCE_PX,
+}: ScatterPluginOptions = {}): ScatterPlugin {
+	let tree: Quadtree<ScatterHit> | null = null;
+	let hit: ScatterHit | null = null;
+
+	// The domain spans every series, so it is resolved once per dataset rather than
+	// once per series path.
+	let cachedData: uPlot.AlignedData | null = null;
+	let cachedDomain: SizeDomain | null = null;
+
+	function getSizeDomain(u: uPlot): SizeDomain | null {
+		if (cachedData !== u.data) {
+			cachedDomain = resolveSizeDomain(u.data);
+			cachedData = u.data;
+		}
+		return cachedDomain;
+	}
+
+	const pathBuilder: Series.PathBuilder = (u, seriesIdx, idx0, idx1) => {
+		const path = new Path2D();
+		const sizes = (u.data[seriesIdx] as unknown as ScatterSeriesData)[2];
+		const domain = getSizeDomain(u);
+		const { pxRatio } = uPlot;
+
+		uPlot.orient(
+			u,
+			seriesIdx,
+			(
+				_series,
+				dataX,
+				dataY,
+				scaleX,
+				scaleY,
+				valToPosX,
+				valToPosY,
+				xOff,
+				yOff,
+				xDim,
+				yDim,
+				_moveTo,
+				_lineTo,
+				_rect,
+				arc,
+			) => {
+				const xMin = scaleX.min ?? -Infinity;
+				const xMax = scaleX.max ?? Infinity;
+				const yMin = scaleY.min ?? -Infinity;
+				const yMax = scaleY.max ?? Infinity;
+
+				for (let i = idx0; i <= idx1; i++) {
+					const x = dataX[i];
+					const y = dataY[i];
+					if (
+						x == null ||
+						y == null ||
+						x < xMin ||
+						x > xMax ||
+						y < yMin ||
+						y > yMax
+					) {
+						continue;
+					}
+
+					const diameter =
+						resolvePointDiameter(sizes?.[i], domain, pointSize) * pxRatio;
+					const radius = diameter / 2;
+					const cx = valToPosX(x, scaleX, xDim, xOff);
+					const cy = valToPosY(y, scaleY, yDim, yOff);
+
+					path.moveTo(cx + radius, cy);
+					arc(path, cx, cy, radius, 0, TWO_PI);
+
+					tree?.add({
+						x: cx - radius - u.bbox.left,
+						y: cy - radius - u.bbox.top,
+						w: diameter,
+						h: diameter,
+						seriesIndex: seriesIdx,
+						dataIndex: i,
+					});
+				}
+			},
+		);
+
+		return { stroke: path, fill: path, clip: null };
+	};
+
+	const cursor: uPlot.Cursor = {
+		// Selection would set the dashboard time range; neither axis is time here.
+		drag: { x: false, y: false, setScale: false },
+		dataIdx: (u, seriesIdx): number | null => {
+			// uPlot asks series 1..n in order on every cursor move; resolve once.
+			if (seriesIdx === 1) {
+				const { left = -1, top = -1 } = u.cursor;
+				const { pxRatio } = uPlot;
+				hit =
+					tree && left >= 0 && top >= 0
+						? resolveHit(
+								tree,
+								left * pxRatio,
+								top * pxRatio,
+								hoverTolerance * pxRatio,
+							)
+						: null;
+			}
+			return hit?.seriesIndex === seriesIdx ? hit.dataIndex : null;
+		},
+		points: {
+			bbox: (_u, seriesIdx): uPlot.BBox => {
+				if (hit?.seriesIndex !== seriesIdx) {
+					return HIDDEN_BBOX;
+				}
+				const { pxRatio } = uPlot;
+				const inset = HOVER_RING_GAP_PX + HOVER_RING_WIDTH_PX;
+				const [left, width] = snapToPixel(
+					hit.x / pxRatio - inset,
+					hit.w / pxRatio + inset * 2,
+				);
+				const [top, height] = snapToPixel(
+					hit.y / pxRatio - inset,
+					hit.h / pxRatio + inset * 2,
+				);
+				return { left, top, width, height };
+			},
+			// An outline around the disc, so the point itself stays readable.
+			fill: (): string => 'transparent',
+			stroke: getSeriesStroke,
+			width: (): number => HOVER_RING_WIDTH_PX,
+		},
+		// uPlot only measures series that returned a data index, i.e. the hit one.
+		focus: { prox: DEFAULT_FOCUS_PROXIMITY_VALUE, dist: (): number => 0 },
+	};
+
+	return {
+		pathBuilder,
+		cursor,
+		hooks: {
+			drawClear: (u: uPlot): void => {
+				tree = new Quadtree<ScatterHit>(0, 0, u.bbox.width, u.bbox.height);
+				// The tree only knows what the path builder last drew, so cached paths
+				// must be rebuilt alongside it.
+				u.series.forEach((series, index) => {
+					if (index > 0) {
+						(series as SeriesWithPaths)._paths = null;
+					}
+				});
+			},
+			destroy: (): void => {
+				tree = null;
+				hit = null;
+				cachedData = null;
+				cachedDomain = null;
+			},
+		},
+		getHit: (): ScatterHit | null => hit,
+	};
+}
+
+export function applyScatterPlugin(
+	builder: UPlotConfigBuilder,
+	plugin: ScatterPlugin,
+): void {
+	builder.setMode(PlotMode.Faceted);
+	builder.setCursor(plugin.cursor);
+	builder.addHook('drawClear', plugin.hooks.drawClear);
+	builder.addHook('destroy', plugin.hooks.destroy);
+}

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

@@ -0,0 +1,58 @@
+import type { QuadtreeRect } from '../../utils/quadtree';
+
+/** Diameters in CSS pixels. `min`/`max` bound the area scale when a size column is mapped. */
+export interface ScatterPointSize {
+	fixed: number;
+	min: number;
+	max: number;
+}
+
+export const DEFAULT_SCATTER_POINT_SIZE: ScatterPointSize = {
+	fixed: 6,
+	min: 4,
+	max: 24,
+};
+
+/** CSS pixels around a point's disc that still register as a hover. */
+export const DEFAULT_HOVER_TOLERANCE_PX = 3;
+
+export interface ScatterPluginOptions {
+	pointSize?: ScatterPointSize;
+	hoverTolerance?: number;
+}
+
+/**
+ * One faceted series: parallel columns, one point per index. Sizes are in the
+ * caller's units and mapped to `pointSize` at draw time; `null` draws at `fixed`.
+ */
+export type ScatterSeriesData = [
+	xs: number[],
+	ys: number[],
+	sizes?: Array<number | null>,
+];
+
+/** Mode-2 data: series 0 is uPlot's x placeholder and carries nothing. */
+export type ScatterChartData = [null, ...ScatterSeriesData[]];
+
+/** A drawn point's disc, in canvas pixels relative to the plot area. */
+export interface ScatterHit extends QuadtreeRect {
+	seriesIndex: number;
+	dataIndex: number;
+}
+
+export interface ScatterChannel {
+	label: string;
+	unit?: string;
+}
+
+/** What each visual channel plots, for the tooltip and axes. */
+export interface ScatterChannels {
+	x: ScatterChannel;
+	y: ScatterChannel;
+	size?: ScatterChannel;
+}
+
+export interface ScatterPointLabel {
+	key: string;
+	value: string;
+}

frontend/src/lib/uPlotV2/plugins/TooltipPlugin/__tests__/buildClickData.test.ts

@@ -0,0 +1,52 @@
+import type uPlot from 'uplot';
+
+import { buildClickData } from '../utils';
+
+jest.mock('lib/uPlotLib/plugins/onClickPlugin', () => ({
+	getFocusedSeriesAtPosition: jest.fn(() => ({ seriesIndex: 1 })),
+}));
+
+const event = {
+	offsetX: 10,
+	offsetY: 20,
+	clientX: 110,
+	clientY: 220,
+} as MouseEvent;
+
+describe('buildClickData', () => {
+	it('skips the x-index lookups on a faceted plot, which has no shared x series', () => {
+		const posToIdx = jest.fn(() => {
+			throw new Error('faceted data[0] is null');
+		});
+		const plot = {
+			data: [null],
+			posToVal: (pos: number): number => pos * 2,
+			posToIdx,
+		} as unknown as uPlot;
+
+		expect(buildClickData(event, plot)).toStrictEqual({
+			xValue: 20,
+			yValue: 40,
+			focusedSeries: null,
+			clickedDataTimestamp: 20,
+			mouseX: 10,
+			mouseY: 20,
+			absoluteMouseX: 110,
+			absoluteMouseY: 220,
+		});
+		expect(posToIdx).not.toHaveBeenCalled();
+	});
+
+	it('resolves the focused series and clicked timestamp on an aligned plot', () => {
+		const plot = {
+			data: [[100, 200, 300]],
+			posToVal: (pos: number): number => pos,
+			posToIdx: (): number => 1,
+		} as unknown as uPlot;
+
+		expect(buildClickData(event, plot)).toMatchObject({
+			focusedSeries: { seriesIndex: 1 },
+			clickedDataTimestamp: 200,
+		});
+	});
+});

frontend/src/lib/uPlotV2/plugins/TooltipPlugin/utils.ts

@@ -174,6 +174,25 @@ export function createLayoutObserver(
 export function buildClickData(event: MouseEvent, plot: uPlot): ChartClickData {
 	const xValue = plot.posToVal(event.offsetX, 'x');
 	const yValue = plot.posToVal(event.offsetY, 'y');
+	const pointer = {
+		mouseX: event.offsetX,
+		mouseY: event.offsetY,
+		absoluteMouseX: event.clientX,
+		absoluteMouseY: event.clientY,
+	};
+
+	// A faceted plot (scatter) has no shared x series, so `data[0]` is null and
+	// `posToIdx` would throw; the hit is the plot's own to resolve.
+	if (plot.data[0] == null) {
+		return {
+			xValue,
+			yValue,
+			focusedSeries: null,
+			clickedDataTimestamp: xValue,
+			...pointer,
+		};
+	}
+
 	const focusedSeries = getFocusedSeriesAtPosition(event, plot);
 
 	const dataIndex = plot.posToIdx(event.offsetX);
@@ -193,9 +212,6 @@ export function buildClickData(event: MouseEvent, plot: uPlot): ChartClickData {
 		yValue,
 		focusedSeries,
 		clickedDataTimestamp,
-		mouseX: event.offsetX,
-		mouseY: event.offsetY,
-		absoluteMouseX: event.clientX,
-		absoluteMouseY: event.clientY,
+		...pointer,
 	};
 }

frontend/src/lib/uPlotV2/utils/__tests__/logGridSplits.test.ts

@@ -0,0 +1,59 @@
+import type uPlot from 'uplot';
+
+import { logScaleSplits, spacedLogLabels } from '../logGridSplits';
+
+describe('logScaleSplits', () => {
+	const splitsFor = (min: number, max: number): number[] =>
+		(
+			logScaleSplits as (
+				u: uPlot,
+				axisIdx: number,
+				min: number,
+				max: number,
+			) => number[]
+		)({} as uPlot, 0, min, max);
+
+	it('splits at 1, 2 and 5 × 10ⁿ inside an unsnapped range', () => {
+		expect(splitsFor(10.6, 990)).toStrictEqual([20, 50, 100, 200, 500]);
+	});
+
+	it('includes the ends when they fall on a split', () => {
+		expect(splitsFor(0.1, 10)).toStrictEqual([0.1, 0.2, 0.5, 1, 2, 5, 10]);
+	});
+
+	it('is empty for a range a log scale cannot hold', () => {
+		expect(splitsFor(0, 10)).toStrictEqual([]);
+		expect(splitsFor(5, 5)).toStrictEqual([]);
+	});
+});
+
+describe('spacedLogLabels', () => {
+	// 100px per decade.
+	const plot = {
+		axes: [{ scale: 'x' }],
+		valToPos: (value: number): number => Math.log10(value) * 100,
+	} as unknown as uPlot;
+	const label = (splits: number[], space: number): (number | null)[] =>
+		spacedLogLabels(plot, splits, 0, space, 0) as (number | null)[];
+
+	it('always labels the powers of ten', () => {
+		expect(label([10, 20, 50, 100], 200)).toStrictEqual([10, null, null, 100]);
+	});
+
+	it('adds a 2 or 5 that clears the labels already kept', () => {
+		// 20 is 30px from 10; 50 is 70px from 10 and 30px from 100.
+		expect(label([10, 20, 50, 100], 25)).toStrictEqual([10, 20, 50, 100]);
+		expect(label([10, 20, 50, 100], 40)).toStrictEqual([10, null, null, 100]);
+	});
+
+	it('labels both ends of a range spanning under a decade', () => {
+		// 100 sits at 200px; 20 (130px) and 500 (270px) clear it, 50 and 200 do not.
+		expect(label([20, 50, 100, 200, 500], 60)).toStrictEqual([
+			20,
+			null,
+			100,
+			null,
+			500,
+		]);
+	});
+});

frontend/src/lib/uPlotV2/utils/__tests__/quadtree.test.ts

@@ -0,0 +1,70 @@
+import { Quadtree, QuadtreeRect } from '../quadtree';
+
+interface Item extends QuadtreeRect {
+	id: number;
+}
+
+function collect(
+	tree: Quadtree<Item>,
+	x: number,
+	y: number,
+	w: number,
+	h: number,
+): Set<number> {
+	const ids = new Set<number>();
+	tree.get(x, y, w, h, (item) => ids.add(item.id));
+	return ids;
+}
+
+describe('Quadtree', () => {
+	it('returns items in the queried region and not those far from it', () => {
+		const tree = new Quadtree<Item>(0, 0, 100, 100);
+		tree.add({ id: 1, x: 10, y: 10, w: 5, h: 5 });
+		tree.add({ id: 2, x: 80, y: 80, w: 5, h: 5 });
+
+		// Below the split threshold every item is visited; callers refine the hit.
+		expect(collect(tree, 9, 9, 8, 8)).toStrictEqual(new Set([1, 2]));
+	});
+
+	it('splits past the object limit and still finds every item', () => {
+		const tree = new Quadtree<Item>(0, 0, 100, 100);
+		const total = 50;
+		for (let id = 0; id < total; id++) {
+			tree.add({ id, x: (id % 10) * 10, y: Math.floor(id / 10) * 10, w: 4, h: 4 });
+		}
+
+		expect(collect(tree, 0, 0, 100, 100).size).toBe(total);
+	});
+
+	it('after a split, a query in one quadrant skips items confined to another', () => {
+		const tree = new Quadtree<Item>(0, 0, 100, 100);
+		for (let id = 0; id < 20; id++) {
+			// All in the north-west quadrant.
+			tree.add({ id, x: 1 + id, y: 1, w: 2, h: 2 });
+		}
+		tree.add({ id: 99, x: 90, y: 90, w: 2, h: 2 });
+
+		const northWest = collect(tree, 0, 0, 10, 10);
+		expect(northWest.has(99)).toBe(false);
+		expect(collect(tree, 85, 85, 10, 10).has(99)).toBe(true);
+	});
+
+	it('reports an item straddling the midline from either side', () => {
+		const tree = new Quadtree<Item>(0, 0, 100, 100);
+		for (let id = 0; id < 20; id++) {
+			tree.add({ id, x: 1, y: 1 + id, w: 2, h: 2 });
+		}
+		tree.add({ id: 99, x: 48, y: 48, w: 4, h: 4 });
+
+		expect(collect(tree, 40, 40, 5, 5).has(99)).toBe(true);
+		expect(collect(tree, 55, 55, 5, 5).has(99)).toBe(true);
+	});
+
+	it('clear empties the tree', () => {
+		const tree = new Quadtree<Item>(0, 0, 100, 100);
+		tree.add({ id: 1, x: 10, y: 10, w: 5, h: 5 });
+		tree.clear();
+
+		expect(collect(tree, 0, 0, 100, 100).size).toBe(0);
+	});
+});

frontend/src/lib/uPlotV2/utils/__tests__/scale.test.ts

@@ -195,3 +195,40 @@ describe('scale utils', () => {
 		});
 	});
 });
+
+describe('symmetric log scale', () => {
+	it('maps to uPlot arcsinh with the given linear threshold', () => {
+		expect(
+			scaleUtils.getDistributionConfig({
+				time: false,
+				distr: DistributionType.SymmetricLog,
+				asinhThreshold: 0.01,
+			}),
+		).toStrictEqual({ distr: 4, log: 10, asinh: 0.01 });
+
+		expect(
+			scaleUtils.getDistributionConfig({
+				time: false,
+				distr: DistributionType.SymmetricLog,
+			}).asinh,
+		).toBe(scaleUtils.DEFAULT_ASINH_THRESHOLD);
+	});
+
+	it('ranges a distr 4 scale through uPlot.rangeAsinh', () => {
+		const rangeAsinh = jest.fn(() => [-10, 1000] as uPlot.Range.MinMax);
+		Object.assign(uPlot, { rangeAsinh });
+
+		const rangeFn = scaleUtils.createRangeFunction({
+			rangeConfig: {} as uPlot.Range.Config,
+			hardMinOnly: false,
+			hardMaxOnly: false,
+			hasFixedRange: false,
+			min: null,
+			max: null,
+		});
+		const u = { scales: { y: { distr: 4, log: 10 } } } as unknown as uPlot;
+
+		expect(rangeFn(u, -3, 700, 'y')).toStrictEqual([-10, 1000]);
+		expect(rangeAsinh).toHaveBeenCalledWith(-3, 700, 10, true);
+	});
+});

frontend/src/lib/uPlotV2/utils/logGridSplits.ts

@@ -0,0 +1,69 @@
+import type uPlot from 'uplot';
+
+const DECADE_TOLERANCE = 1e-9;
+
+function isDecade(value: number): boolean {
+	if (value === 0) {
+		return true;
+	}
+	const exponent = Math.log10(Math.abs(value));
+	return Math.abs(exponent - Math.round(exponent)) < DECADE_TOLERANCE;
+}
+
+const LOG_SPLIT_MULTIPLES = [1, 2, 5];
+
+/**
+ * Splits at 1, 2 and 5 × 10ⁿ inside the scale. uPlot's own log splits step
+ * from the scale's minimum, so a range not snapped to a power of ten would
+ * label 10.79, 21.58, … instead.
+ */
+export const logScaleSplits: uPlot.Axis.Splits = (_u, _axisIdx, min, max) => {
+	if (!(min > 0) || !(max > min)) {
+		return [];
+	}
+	const splits: number[] = [];
+	for (
+		let exponent = Math.floor(Math.log10(min));
+		exponent <= Math.ceil(Math.log10(max));
+		exponent++
+	) {
+		LOG_SPLIT_MULTIPLES.forEach((multiple) => {
+			// Rounded through toPrecision so 0.1 × 3 noise can't fall outside [min, max].
+			const split = Number((multiple * 10 ** exponent).toPrecision(12));
+			if (split >= min && split <= max) {
+				splits.push(split);
+			}
+		});
+	}
+	return splits;
+};
+
+/**
+ * Labels for `logScaleSplits`: every power of ten, then any 2 or 5 that sits
+ * at least `space` px from the labels already kept, so a range spanning under
+ * one decade still reads at both ends.
+ */
+export const spacedLogLabels: uPlot.Axis.Filter = (
+	u,
+	splits,
+	axisIdx,
+	space,
+) => {
+	const scaleKey = u.axes[axisIdx]?.scale ?? 'x';
+	const positions = splits.map((split) =>
+		split == null ? null : u.valToPos(split, scaleKey),
+	);
+	const kept = splits.map((split) => split != null && isDecade(split));
+	const isClear = (index: number): boolean =>
+		kept.every(
+			(isKept, other) =>
+				!isKept ||
+				Math.abs((positions[other] ?? 0) - (positions[index] ?? 0)) >= space,
+		);
+	splits.forEach((split, index) => {
+		if (split != null && !kept[index] && isClear(index)) {
+			kept[index] = true;
+		}
+	});
+	return splits.map((split, index) => (kept[index] ? split : null));
+};

frontend/src/lib/uPlotV2/utils/quadtree.ts

@@ -0,0 +1,110 @@
+export interface QuadtreeRect {
+	x: number;
+	y: number;
+	w: number;
+	h: number;
+}
+
+const MAX_OBJECTS = 10;
+const MAX_LEVELS = 4;
+
+/**
+ * Spatial index over axis-aligned rectangles, for answering "what is under the
+ * cursor" on charts whose marks have no shared x order to binary-search. An item
+ * straddling a quadrant boundary lives in every quadrant it touches, so `get` can
+ * report it more than once.
+ */
+export class Quadtree<T extends QuadtreeRect = QuadtreeRect> {
+	private items: T[] = [];
+	private quadrants: Quadtree<T>[] | null = null;
+
+	constructor(
+		private readonly x: number,
+		private readonly y: number,
+		private readonly w: number,
+		private readonly h: number,
+		private readonly level = 0,
+	) {}
+
+	add(item: T): void {
+		if (this.quadrants) {
+			this.forEachQuadrant(item, (quadrant) => quadrant.add(item));
+			return;
+		}
+
+		this.items.push(item);
+
+		if (this.items.length > MAX_OBJECTS && this.level < MAX_LEVELS) {
+			this.split();
+			const items = this.items;
+			this.items = [];
+			for (const existing of items) {
+				this.forEachQuadrant(existing, (quadrant) => quadrant.add(existing));
+			}
+		}
+	}
+
+	/** Visits every item whose quadrant overlaps the rectangle; callers refine the test. */
+	get(
+		x: number,
+		y: number,
+		w: number,
+		h: number,
+		visit: (item: T) => void,
+	): void {
+		for (const item of this.items) {
+			visit(item);
+		}
+		if (this.quadrants) {
+			this.forEachQuadrant({ x, y, w, h }, (quadrant) =>
+				quadrant.get(x, y, w, h, visit),
+			);
+		}
+	}
+
+	clear(): void {
+		this.items = [];
+		this.quadrants = null;
+	}
+
+	private split(): void {
+		const w = this.w / 2;
+		const h = this.h / 2;
+		const level = this.level + 1;
+		// North-east, north-west, south-west, south-east.
+		this.quadrants = [
+			new Quadtree<T>(this.x + w, this.y, w, h, level),
+			new Quadtree<T>(this.x, this.y, w, h, level),
+			new Quadtree<T>(this.x, this.y + h, w, h, level),
+			new Quadtree<T>(this.x + w, this.y + h, w, h, level),
+		];
+	}
+
+	private forEachQuadrant(
+		rect: QuadtreeRect,
+		visit: (quadrant: Quadtree<T>) => void,
+	): void {
+		if (!this.quadrants) {
+			return;
+		}
+		const midX = this.x + this.w / 2;
+		const midY = this.y + this.h / 2;
+		const startsNorth = rect.y < midY;
+		const startsWest = rect.x < midX;
+		const endsEast = rect.x + rect.w > midX;
+		const endsSouth = rect.y + rect.h > midY;
+
+		if (startsNorth && endsEast) {
+			visit(this.quadrants[0]);
+		}
+		if (startsWest && startsNorth) {
+			visit(this.quadrants[1]);
+		}
+		if (startsWest && endsSouth) {
+			visit(this.quadrants[2]);
+		}
+		if (endsEast && endsSouth) {
+			visit(this.quadrants[3]);
+		}
+	}
+}

frontend/src/lib/uPlotV2/utils/scale.ts

@@ -58,18 +58,23 @@ function normalizeLogLimit(
 	return logBase ** exp;
 }
 
+export const DEFAULT_ASINH_THRESHOLD = 1;
+
 /**
- * Returns uPlot scale distribution options for the Y axis.
- * Time (X) scale gets no distr/log; Y scale gets distr 1 (linear) or 3 (log) and log base 2 or 10.
+ * Returns uPlot scale distribution options for a value axis.
+ * Time scales get no distr/log; value scales get distr 1 (linear), 3 (log) or
+ * 4 (arcsinh, uPlot's symmetric log) and log base 2 or 10.
  */
 export function getDistributionConfig({
 	time,
 	distr,
 	logBase,
+	asinhThreshold,
 }: {
 	time: ScaleProps['time'];
 	distr?: DistributionType;
 	logBase?: number;
+	asinhThreshold?: number;
 }): Partial<Scale> {
 	if (time) {
 		return {};
@@ -77,6 +82,14 @@ export function getDistributionConfig({
 
 	const resolvedLogBase = (logBase ?? 10) === 2 ? 2 : 10;
 
+	if (distr === DistributionType.SymmetricLog) {
+		return {
+			distr: 4,
+			log: resolvedLogBase,
+			asinh: asinhThreshold ?? DEFAULT_ASINH_THRESHOLD,
+		};
+	}
+
 	return {
 		distr: distr === DistributionType.Logarithmic ? 3 : 1,
 		log: resolvedLogBase,
@@ -197,6 +210,33 @@ function getLogScaleRange(
 	);
 }
 
+/**
+ * Computes the arcsinh-scale range using uPlot.rangeAsinh, which pads to whole
+ * magnitudes on either side of zero and pins an edge that sits exactly on zero.
+ */
+function getAsinhScaleRange(
+	minMax: Range.MinMax,
+	params: RangeFunctionParams,
+	dataMin: number | null,
+	dataMax: number | null,
+	logBase?: uPlot.Scale['log'],
+): Range.MinMax {
+	const { min, max } = params;
+	const resolvedMin = min ?? dataMin;
+	const resolvedMax = max ?? dataMax;
+
+	if (resolvedMin == null || resolvedMax == null) {
+		return minMax;
+	}
+
+	return uPlot.rangeAsinh(
+		resolvedMin,
+		resolvedMax,
+		(logBase ?? 10) as 2 | 10,
+		true,
+	);
+}
+
 /**
  * Snaps log-scale [min, max] to exact powers of logBase (nearest magnitude below/above).
  * If min and max would be equal after snapping, max is increased by one magnitude so the range is valid.
@@ -299,6 +339,8 @@ export function createRangeFunction(
 			minMax = getLogScaleRange(minMax, params, dataMin, dataMax, logBase);
 			const logFn = scale.log === 2 ? Math.log2 : Math.log10;
 			minMax = adjustLogRange(minMax, (logBase ?? 10) as number, logFn);
+		} else if (scale.distr === 4) {
+			minMax = getAsinhScaleRange(minMax, params, dataMin, dataMax, logBase);
 		}
 
 		minMax = applyHardLimits(minMax, params, scale.distr ?? 1);

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

@@ -37,6 +37,7 @@ export default function ChartWrapper({
 	syncKey,
 	syncFilterMode,
 	onDestroy = noop,
+	plotRef,
 	children,
 	layoutChildren,
 	yAxisUnit,
@@ -123,6 +124,7 @@ export default function ChartWrapper({
 						height={chartHeight}
 						plotRef={(plot): void => {
 							plotInstanceRef.current = plot;
+							plotRef?.(plot);
 						}}
 						onDestroy={(plot: uPlot): void => {
 							plotInstanceRef.current = null;

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

@@ -0,0 +1,45 @@
+import { render } from 'tests/test-utils';
+import type uPlot from 'uplot';
+
+import { LegendPosition } from 'lib/uPlotV2/components/types';
+import { UPlotConfigBuilder } from 'lib/uPlotV2/config/UPlotConfigBuilder';
+
+import ChartWrapper from '../ChartWrapper';
+
+const FAKE_PLOT = { id: 'plot' } as unknown as uPlot;
+
+jest.mock('lib/uPlotV2/components/UPlotChart/UPlotChart', () => ({
+	__esModule: true,
+	default: ({ plotRef }: { plotRef?: (plot: uPlot | null) => void }): null => {
+		plotRef?.(FAKE_PLOT);
+		return null;
+	},
+}));
+
+window.ResizeObserver =
+	window.ResizeObserver ||
+	jest.fn().mockImplementation(() => ({
+		disconnect: jest.fn(),
+		observe: jest.fn(),
+		unobserve: jest.fn(),
+	}));
+
+describe('ChartWrapper', () => {
+	it('hands the plot instance to the caller', () => {
+		const plotRef = jest.fn();
+		render(
+			<ChartWrapper
+				config={new UPlotConfigBuilder({ id: 'chart' })}
+				data={[[1], [2]]}
+				width={400}
+				height={300}
+				legendConfig={{ position: LegendPosition.BOTTOM }}
+				showLegend={false}
+				showTooltip={false}
+				plotRef={plotRef}
+			/>,
+		);
+
+		expect(plotRef).toHaveBeenCalledWith(FAKE_PLOT);
+	});
+});

frontend/src/lib/visualization/charts/Scatter/Scatter.stories.tsx

@@ -0,0 +1,256 @@
+import { useMemo, useState } from 'react';
+import type { Meta, StoryObj } from '@storybook/react-vite';
+import { useIsDarkMode } from 'hooks/useDarkMode';
+import { LegendPosition } from 'lib/uPlotV2/components/types';
+import type { Threshold } from 'lib/uPlotV2/hooks/types';
+import type { ScatterPointLabel } from 'lib/uPlotV2/plugins/ScatterPlugin/types';
+
+import Scatter from './Scatter';
+import {
+	buildScatterConfig,
+	prepareScatterChartData,
+	ScatterAxisScale,
+	ScatterSeries,
+} from './utils';
+
+const SERVICES = [
+	'frontend',
+	'cart',
+	'checkout',
+	'payment',
+	'shipping',
+	'currency',
+	'email',
+	'recommendation',
+	'ads',
+	'product-catalog',
+];
+
+type Shape = 'spread' | 'single' | 'sameX';
+
+interface ScatterStoryProps {
+	groups: number;
+	pointsPerGroup: number;
+	/** Adds an error-count size column. */
+	sized: boolean;
+	xScale: ScatterAxisScale;
+	yScale: ScatterAxisScale;
+	/** Zeroes a share of y values, which forces the symmetric log. */
+	withZeros: boolean;
+	shape: Shape;
+	thresholds: boolean;
+	pointSize: number;
+	/** 0–1. */
+	fillOpacity: number;
+	width: number;
+	height: number;
+}
+
+/** Deterministic, so a story renders the same points on every run. */
+function createRng(seed: number): () => number {
+	let state = seed >>> 0;
+	return (): number => {
+		state = (state * 1664525 + 1013904223) >>> 0;
+		return state / 2 ** 32;
+	};
+}
+
+function buildSeries({
+	groups,
+	pointsPerGroup,
+	sized,
+	withZeros,
+	shape,
+}: ScatterStoryProps): ScatterSeries[] {
+	const rng = createRng(42);
+	return Array.from({ length: groups }, (_, groupIndex) => {
+		const label = SERVICES[groupIndex % SERVICES.length];
+		// Each service sits in its own throughput/latency band, so groups are telling
+		// apart rather than one cloud.
+		const baseThroughput = 20 * 2 ** (groupIndex % 5);
+		const baseLatency = 40 + 60 * (groupIndex % 4);
+
+		const count = shape === 'single' ? 1 : pointsPerGroup;
+		const xs: number[] = [];
+		const ys: number[] = [];
+		const sizes: Array<number | null> = [];
+
+		for (let i = 0; i < count; i++) {
+			const throughput =
+				shape === 'sameX' ? baseThroughput : baseThroughput * (0.5 + rng() * 1.5);
+			// Latency grows with load, plus noise; the odd outlier keeps the axis honest.
+			const outlier = rng() < 0.03 ? 4 + rng() * 6 : 1;
+			let latency =
+				baseLatency *
+				(0.8 + (throughput / baseThroughput) * 0.4 + rng() * 0.3) *
+				outlier;
+			if (withZeros && rng() < 0.2) {
+				latency = 0;
+			}
+			xs.push(Number(throughput.toFixed(2)));
+			ys.push(Number(latency.toFixed(2)));
+			sizes.push(rng() < 0.1 ? null : Math.round(rng() * rng() * 500));
+		}
+
+		return sized ? { label, xs, ys, sizes } : { label, xs, ys };
+	});
+}
+
+const THRESHOLDS: Threshold[] = [
+	{
+		thresholdValue: 300,
+		thresholdUnit: 'ms',
+		thresholdColor: '#E5484D',
+		thresholdLabel: 'p99 SLO',
+	},
+];
+
+function ScatterStory(props: ScatterStoryProps): JSX.Element {
+	const {
+		xScale,
+		yScale,
+		sized,
+		thresholds,
+		pointSize,
+		fillOpacity,
+		width,
+		height,
+	} = props;
+	const isDarkMode = useIsDarkMode();
+	const [drawMs, setDrawMs] = useState<number | null>(null);
+
+	const series = useMemo(() => buildSeries(props), [props]);
+	const pointCount = series.reduce((sum, entry) => sum + entry.xs.length, 0);
+	const drawLabel = drawMs === null ? '—' : `${drawMs.toFixed(1)} ms`;
+
+	const config = useMemo(() => {
+		const builder = buildScatterConfig({
+			id: 'scatter-story',
+			series,
+			isDarkMode,
+			x: { unit: 'reqps', scale: xScale },
+			y: { unit: 'ms', scale: yScale },
+			pointSize: { fixed: pointSize, min: 4, max: pointSize * 4 },
+			fillOpacity,
+			thresholds: thresholds ? THRESHOLDS : undefined,
+		});
+		let started = 0;
+		builder.addHook('drawClear', (): void => {
+			started = performance.now();
+		});
+		builder.addHook('draw', (): void => {
+			setDrawMs(performance.now() - started);
+		});
+		return builder;
+	}, [series, isDarkMode, xScale, yScale, pointSize, fillOpacity, thresholds]);
+
+	const data = useMemo(() => prepareScatterChartData(series), [series]);
+
+	const resolvePointLabels = (
+		seriesIndex: number,
+		dataIndex: number,
+	): ScatterPointLabel[] => [
+		{ key: 'service.name', value: series[seriesIndex - 1]?.label ?? '' },
+		{
+			key: 'k8s.pod.name',
+			value: `pod-${dataIndex.toString().padStart(3, '0')}`,
+		},
+	];
+
+	return (
+		<div style={{ width, padding: 16 }}>
+			<Scatter
+				config={config}
+				data={data}
+				width={width}
+				height={height}
+				legendConfig={{ position: LegendPosition.BOTTOM }}
+				channels={{
+					x: { label: 'Throughput', unit: 'reqps' },
+					y: { label: 'p99 latency', unit: 'ms' },
+					...(sized && { size: { label: 'Errors', unit: 'short' } }),
+				}}
+				resolvePointLabels={resolvePointLabels}
+				canPinTooltip
+			/>
+			<p style={{ fontFamily: 'var(--font-mono)', fontSize: 12, opacity: 0.7 }}>
+				{`${pointCount.toLocaleString()} points · last draw ${drawLabel}`}
+			</p>
+		</div>
+	);
+}
+
+const meta = {
+	title: 'Charts/Scatter',
+	component: ScatterStory,
+	parameters: { layout: 'padded' },
+	args: {
+		groups: 1,
+		pointsPerGroup: 10,
+		sized: false,
+		xScale: ScatterAxisScale.Linear,
+		yScale: ScatterAxisScale.Linear,
+		withZeros: false,
+		shape: 'spread',
+		thresholds: false,
+		pointSize: 6,
+		fillOpacity: 0.7,
+		width: 800,
+		height: 420,
+	},
+	argTypes: {
+		shape: { control: 'radio', options: ['spread', 'single', 'sameX'] },
+		xScale: { control: 'radio', options: Object.values(ScatterAxisScale) },
+		yScale: { control: 'radio', options: Object.values(ScatterAxisScale) },
+		fillOpacity: { control: { type: 'range', min: 0, max: 1, step: 0.05 } },
+		pointSize: { control: { type: 'range', min: 2, max: 16, step: 1 } },
+	},
+} satisfies Meta<ScatterStoryProps>;
+
+export default meta;
+
+type Story = StoryObj<ScatterStoryProps>;
+
+/** One service, ten points: axes formatted with units, hover picks the right point. */
+export const Basic: Story = {};
+
+/** Five services, one legend entry each; toggling a row hides its points. */
+export const Grouped: Story = {
+	args: { groups: 5, pointsPerGroup: 40 },
+};
+
+/** Error count as disc area, between the configured min and max diameters. */
+export const Sized: Story = {
+	args: { groups: 5, pointsPerGroup: 40, sized: true, pointSize: 5 },
+};
+
+/** Log x; a fifth of the latencies are 0, so y falls back to the symmetric log. */
+export const LogAxes: Story = {
+	args: {
+		groups: 5,
+		pointsPerGroup: 60,
+		xScale: ScatterAxisScale.Log,
+		yScale: ScatterAxisScale.Log,
+		withZeros: true,
+	},
+};
+
+/** A single point still gets a padded range rather than an empty plot. */
+export const SinglePoint: Story = {
+	args: { shape: 'single' },
+};
+
+/** Fifty points sharing one x collide on nothing: no shared x array to align. */
+export const SameX: Story = {
+	args: { groups: 3, pointsPerGroup: 50, shape: 'sameX' },
+};
+
+/** Horizontal line with label on the y axis; the scale stretches to include it. */
+export const Thresholds: Story = {
+	args: { groups: 3, pointsPerGroup: 40, thresholds: true },
+};
+
+/** Perf harness: raise `pointsPerGroup` and read the draw time under the chart. */
+export const Dense: Story = {
+	args: { groups: 5, pointsPerGroup: 1000, pointSize: 4, fillOpacity: 0.5 },
+};

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

@@ -0,0 +1,102 @@
+import { useCallback, useRef } from 'react';
+import ChartWrapper from 'lib/visualization/charts/ChartWrapper/ChartWrapper';
+import ScatterTooltip from 'lib/uPlotV2/components/Tooltip/ScatterTooltip';
+import {
+	ScatterTooltipProps,
+	TooltipRenderArgs,
+} from 'lib/uPlotV2/components/types';
+import type { ChartClickData } from 'lib/uPlotV2/plugins/TooltipPlugin/types';
+import uPlot from 'uplot';
+
+import { ScatterChartProps } from 'lib/visualization/charts/types';
+
+import { getSeriesStroke } from 'lib/uPlotV2/plugins/ScatterPlugin/scatterPlugin';
+
+import { getCursorHit } from './utils';
+
+// Faceted uPlot reads series 1's facets at init, so a chart with no series cannot
+// mount; empty aligned data makes the shell show its no-data state instead.
+const EMPTY_ALIGNED_DATA: uPlot.AlignedData = [[]];
+
+export default function Scatter(props: ScatterChartProps): JSX.Element {
+	const {
+		children,
+		customTooltip,
+		channels,
+		resolvePointLabels,
+		pinnedTooltipElement,
+		onPointClick,
+		plotRef,
+		...rest
+	} = props;
+
+	const plotInstanceRef = useRef<uPlot | null>(null);
+
+	const handlePlotRef = useCallback(
+		(plot: uPlot | null): void => {
+			plotInstanceRef.current = plot;
+			plotRef?.(plot);
+		},
+		[plotRef],
+	);
+
+	// The shared click data finds its series by x position, which a faceted plot
+	// has no single axis for; the hit comes from the cursor instead.
+	const handleClick = useCallback(
+		(click: ChartClickData): void => {
+			const plot = plotInstanceRef.current;
+			const hit = plot ? getCursorHit(plot) : null;
+			if (!plot || !hit || !onPointClick) {
+				return;
+			}
+			onPointClick({
+				...hit,
+				color: getSeriesStroke(plot, hit.seriesIndex),
+				coordinates: { x: click.absoluteMouseX, y: click.absoluteMouseY },
+			});
+		},
+		[onPointClick],
+	);
+
+	const renderTooltip = useCallback(
+		(args: TooltipRenderArgs): React.ReactNode => {
+			if (customTooltip) {
+				return customTooltip(args);
+			}
+			const tooltipProps: ScatterTooltipProps = {
+				...args,
+				id: rest.config.getId(),
+				channels,
+				resolvePointLabels,
+				decimalPrecision: rest.decimalPrecision,
+				canPinTooltip: rest.canPinTooltip,
+				renderTooltipFooter: rest.renderTooltipFooter,
+			};
+			return <ScatterTooltip {...tooltipProps} />;
+		},
+		[
+			customTooltip,
+			channels,
+			resolvePointLabels,
+			rest.config,
+			rest.decimalPrecision,
+			rest.canPinTooltip,
+			rest.renderTooltipFooter,
+		],
+	);
+
+	const hasSeries = rest.data.length > 1;
+
+	return (
+		<ChartWrapper
+			{...rest}
+			data={hasSeries ? rest.data : EMPTY_ALIGNED_DATA}
+			plotRef={handlePlotRef}
+			onClick={onPointClick ? handleClick : rest.onClick}
+			customTooltip={renderTooltip}
+			pinnedTooltipElement={pinnedTooltipElement}
+		>
+			{children}
+		</ChartWrapper>
+	);
+}

frontend/src/lib/visualization/charts/Scatter/__tests__/scatterRange.test.ts

@@ -0,0 +1,97 @@
+import { DistributionType } from 'lib/uPlotV2/config/types';
+import uPlot from 'uplot';
+
+import { createScatterRange, type ScatterRangeOptions } from '../scatterRange';
+
+/** A 220px-tall, 420px-wide plot at a device pixel ratio of 1. */
+const plot = { bbox: { width: 420, height: 220 } } as unknown as uPlot;
+
+function rangeOf(
+	options: Partial<ScatterRangeOptions>,
+	dataMin: number | null,
+	dataMax: number | null,
+): [number, number] {
+	const range = createScatterRange({
+		dimension: 'y',
+		marginPx: 10,
+		distribution: DistributionType.Linear,
+		...options,
+	}) as (u: uPlot, min: number | null, max: number | null) => [number, number];
+	return range(plot, dataMin, dataMax);
+}
+
+describe('createScatterRange', () => {
+	beforeAll(() => {
+		Object.defineProperty(uPlot, 'pxRatio', { value: 1, configurable: true });
+	});
+
+	it('widens a linear range so the data sits marginPx inside each edge', () => {
+		// 200px of data inside 220px: 10px at each end is 1/20 of the span.
+		expect(rangeOf({}, 0, 100)).toStrictEqual([-5, 105]);
+	});
+
+	it('measures the margin along its own axis', () => {
+		// 400px of data inside 420px.
+		expect(rangeOf({ dimension: 'x' }, 0, 100)).toStrictEqual([-2.5, 102.5]);
+	});
+
+	it('pads a log range in decades, without snapping to the next power of ten', () => {
+		const [min, max] = rangeOf(
+			{ distribution: DistributionType.Logarithmic },
+			1,
+			10,
+		);
+		expect(Math.log10(min)).toBeCloseTo(-0.05);
+		expect(Math.log10(max)).toBeCloseTo(1.05);
+	});
+
+	it('pads a symmetric log range in its asinh space', () => {
+		const [min, max] = rangeOf(
+			{ distribution: DistributionType.SymmetricLog, asinhThreshold: 2 },
+			0,
+			20,
+		);
+		const span = Math.asinh(10);
+		expect(Math.asinh(min / 2)).toBeCloseTo(-span / 20);
+		expect(Math.asinh(max / 2)).toBeCloseTo(span + span / 20);
+	});
+
+	it('stretches to the soft limits before padding', () => {
+		expect(rangeOf({ softMin: 0, softMax: 200 }, 50, 100)).toStrictEqual([
+			-10, 210,
+		]);
+	});
+
+	it('ignores a soft min at or below zero on a log scale', () => {
+		const [min] = rangeOf(
+			{ distribution: DistributionType.Logarithmic, softMin: 0 },
+			10,
+			100,
+		);
+		expect(min).toBeGreaterThan(0);
+	});
+
+	it('spreads a single value around itself', () => {
+		const [min, max] = rangeOf({}, 5, 5);
+		expect(min).toBeLessThan(5);
+		expect(max).toBeGreaterThan(5);
+		expect(5 - min).toBeCloseTo(max - 5);
+	});
+
+	it('falls back to a unit range with no data', () => {
+		expect(rangeOf({}, null, null)).toStrictEqual([0, 1]);
+		expect(
+			rangeOf({ distribution: DistributionType.Logarithmic }, null, null),
+		).toStrictEqual([1, 10]);
+	});
+
+	it('skips the margin on a plot too small to hold it', () => {
+		const tiny = { bbox: { width: 15, height: 15 } } as unknown as uPlot;
+		const range = createScatterRange({
+			dimension: 'y',
+			marginPx: 10,
+			distribution: DistributionType.Linear,
+		}) as (u: uPlot, min: number, max: number) => [number, number];
+		expect(range(tiny, 0, 100)).toStrictEqual([0, 100]);
+	});
+});

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

@@ -0,0 +1,217 @@
+import type uPlot from 'uplot';
+import { DistributionType } from 'lib/uPlotV2/config/types';
+
+import {
+	buildScatterConfig,
+	getCursorHit,
+	prepareScatterChartData,
+	resolveAxisDistribution,
+	ScatterAxisScale,
+	ScatterSeries,
+} from '../utils';
+
+jest.mock('lib/visualization/panels/utils/legendVisibilityUtils', () => ({
+	getStoredSeriesVisibility: jest.fn(),
+}));
+
+const SERIES: ScatterSeries[] = [
+	{ label: 'cart', xs: [10, 20], ys: [100, 200], sizes: [1, null] },
+	{ label: 'checkout', xs: [30], ys: [0] },
+];
+
+describe('prepareScatterChartData', () => {
+	it('lays series out as facets behind an empty x slot', () => {
+		expect(prepareScatterChartData(SERIES)).toStrictEqual([
+			null,
+			[
+				[10, 20],
+				[100, 200],
+				[1, null],
+			],
+			[[30], [0]],
+		]);
+	});
+});
+
+describe('getCursorHit', () => {
+	const plotWith = (idxs: Array<number | null>): uPlot =>
+		({ cursor: { idxs } }) as unknown as uPlot;
+
+	it('reads the series the scatter plugin answered for', () => {
+		expect(getCursorHit(plotWith([null, null, 4, null]))).toStrictEqual({
+			seriesIndex: 2,
+			dataIndex: 4,
+		});
+	});
+
+	it('takes a data index of 0 as a hit', () => {
+		expect(getCursorHit(plotWith([0, 0]))).toStrictEqual({
+			seriesIndex: 1,
+			dataIndex: 0,
+		});
+	});
+
+	it('is null off every dot', () => {
+		expect(getCursorHit(plotWith([null, null]))).toBeNull();
+		expect(getCursorHit({ cursor: {} } as unknown as uPlot)).toBeNull();
+	});
+});
+
+describe('resolveAxisDistribution', () => {
+	it('is linear when asked, whatever the values', () => {
+		expect(
+			resolveAxisDistribution([1, 1e6], ScatterAxisScale.Linear),
+		).toStrictEqual({ distribution: DistributionType.Linear });
+	});
+
+	it('is a plain log when every value is positive', () => {
+		expect(resolveAxisDistribution([1, 100], ScatterAxisScale.Log)).toStrictEqual(
+			{ distribution: DistributionType.Logarithmic },
+		);
+	});
+
+	it('falls back from log to a symmetric log around the smallest magnitude when zero is present', () => {
+		expect(
+			resolveAxisDistribution([0, 0.05, 300], ScatterAxisScale.Log),
+		).toStrictEqual({
+			distribution: DistributionType.SymmetricLog,
+			asinhThreshold: 0.01,
+		});
+	});
+
+	it('keeps an explicit log axis for a soft min it cannot place', () => {
+		expect(
+			resolveAxisDistribution([1, 100], ScatterAxisScale.Log, [-10]),
+		).toStrictEqual({ distribution: DistributionType.Logarithmic });
+	});
+
+	it('is a symmetric log when asked, even with only positive values', () => {
+		expect(
+			resolveAxisDistribution([2, 300], ScatterAxisScale.SymLog),
+		).toStrictEqual({
+			distribution: DistributionType.SymmetricLog,
+			asinhThreshold: 1,
+		});
+	});
+
+	it('uses a unit threshold when nothing is positive', () => {
+		expect(
+			resolveAxisDistribution([0, -5], ScatterAxisScale.SymLog),
+		).toStrictEqual({
+			distribution: DistributionType.SymmetricLog,
+			asinhThreshold: 1,
+		});
+	});
+
+	describe('auto', () => {
+		it.each([
+			[
+				'positive values spanning three decades',
+				[1, 1000],
+				DistributionType.Logarithmic,
+			],
+			['positive values spanning less', [1, 999], DistributionType.Linear],
+			['a wide span that includes zero', [0, 1, 1e6], DistributionType.Linear],
+			['no finite values', [Number.NaN], DistributionType.Linear],
+		])('picks a scale for %s', (_, values, distribution) => {
+			expect(resolveAxisDistribution(values, ScatterAxisScale.Auto)).toStrictEqual(
+				{ distribution },
+			);
+		});
+
+		it('stays linear when a soft limit reaches zero or below', () => {
+			expect(
+				resolveAxisDistribution([0.02, 5000], ScatterAxisScale.Auto, [-10]),
+			).toStrictEqual({ distribution: DistributionType.Linear });
+		});
+
+		it('counts a soft limit towards the decades it spans', () => {
+			expect(
+				resolveAxisDistribution([5, 50], ScatterAxisScale.Auto, [null, 5000]),
+			).toStrictEqual({ distribution: DistributionType.Logarithmic });
+		});
+
+		it('is the default', () => {
+			expect(resolveAxisDistribution([1, 1e4])).toStrictEqual({
+				distribution: DistributionType.Logarithmic,
+			});
+		});
+	});
+});
+
+describe('buildScatterConfig', () => {
+	const build = (
+		overrides: Partial<Parameters<typeof buildScatterConfig>[0]> = {},
+	): ReturnType<typeof buildScatterConfig> =>
+		buildScatterConfig({
+			id: 'scatter',
+			series: SERIES,
+			isDarkMode: true,
+			x: { unit: 'reqps' },
+			y: { unit: 'ms', scale: ScatterAxisScale.Log },
+			...overrides,
+		});
+
+	it('draws a line along both plot edges', () => {
+		const [xAxis, yAxis] = build().getConfig().axes ?? [];
+
+		expect(xAxis?.border?.show).toBe(true);
+		expect(yAxis?.border?.show).toBe(true);
+	});
+
+	it('titles each axis with its label, and leaves an unlabelled one bare', () => {
+		const config = build({
+			x: { unit: 'reqps', label: 'Throughput' },
+			y: { unit: 'ms', label: '' },
+		}).getConfig();
+		const [xAxis, yAxis] = config.axes ?? [];
+
+		expect(xAxis?.label).toBe('Throughput');
+		expect(yAxis?.label).toBeUndefined();
+	});
+
+	it('emits a faceted plot with two value scales', () => {
+		const config = build().getConfig();
+
+		expect(config.mode).toBe(2);
+		expect(config.scales?.x).toMatchObject({ time: false, distr: 1 });
+		// The y column has a 0, so log becomes the symmetric variant.
+		expect(config.scales?.y).toMatchObject({ time: false, distr: 4 });
+	});
+
+	it('draws one faceted series per group with the plugin path builder', () => {
+		const config = build().getConfig();
+		const [, cart, checkout] = config.series ?? [];
+
+		expect(config.series).toHaveLength(3);
+		expect(cart).toMatchObject({
+			label: 'cart',
+			facets: [
+				{ scale: 'x', auto: true },
+				{ scale: 'y', auto: true },
+			],
+		});
+		expect(typeof cart?.paths).toBe('function');
+		expect(cart?.paths).toBe(checkout?.paths);
+		expect(cart?.points?.show).toBe(false);
+	});
+
+	it('formats both axes with their units', () => {
+		const config = build().getConfig();
+		const [xAxis, yAxis] = config.axes ?? [];
+
+		expect(xAxis).toMatchObject({ scale: 'x', side: 2, space: 90 });
+		expect(yAxis).toMatchObject({ scale: 'y', side: 3 });
+		expect(typeof xAxis?.values).toBe('function');
+		expect(typeof yAxis?.values).toBe('function');
+	});
+
+	it('registers a y threshold draw hook when thresholds are given', () => {
+		const config = build({
+			thresholds: [{ thresholdValue: 300, thresholdUnit: 'ms' }],
+		}).getConfig();
+
+		expect(config.hooks?.draw).toHaveLength(1);
+		expect(build().getConfig().hooks?.draw).toBeUndefined();
+	});
+});

frontend/src/lib/visualization/charts/Scatter/scatterRange.ts

@@ -0,0 +1,108 @@
+import { DistributionType } from 'lib/uPlotV2/config/types';
+import uPlot from 'uplot';
+
+import type { AxisDistribution } from './utils';
+
+interface ScaleTransform {
+	forward: (value: number) => number;
+	inverse: (position: number) => number;
+}
+
+/** The space uPlot lays the scale out in, so a pixel margin is the same size along it. */
+function getScaleTransform({
+	distribution,
+	asinhThreshold = 1,
+}: AxisDistribution): ScaleTransform {
+	switch (distribution) {
+		case DistributionType.Logarithmic:
+			return {
+				forward: (value): number => Math.log10(value),
+				inverse: (position): number => 10 ** position,
+			};
+		case DistributionType.SymmetricLog:
+			return {
+				forward: (value): number => Math.asinh(value / asinhThreshold),
+				inverse: (position): number => Math.sinh(position) * asinhThreshold,
+			};
+		default:
+			return {
+				forward: (value): number => value,
+				inverse: (position): number => position,
+			};
+	}
+}
+
+/** Half the span a single value spreads to, in transformed units. */
+const SINGLE_VALUE_HALF_SPAN = 0.5;
+
+/** The data's extent stretched to the soft limits; null with neither. */
+function resolveExtent(
+	dataMin: number | null,
+	dataMax: number | null,
+	softMin: number | null | undefined,
+	softMax: number | null | undefined,
+): [number, number] | null {
+	const lows = [dataMin, softMin].filter(
+		(value): value is number => value != null && Number.isFinite(value),
+	);
+	const highs = [dataMax, softMax].filter(
+		(value): value is number => value != null && Number.isFinite(value),
+	);
+	return lows.length > 0 && highs.length > 0
+		? [Math.min(...lows), Math.max(...highs)]
+		: null;
+}
+
+export interface ScatterRangeOptions extends AxisDistribution {
+	/** The axis this scale is laid out along. */
+	dimension: 'x' | 'y';
+	/** CSS pixels kept clear at each end so the largest dot draws whole. */
+	marginPx: number;
+	softMin?: number | null;
+	softMax?: number | null;
+}
+
+/**
+ * Fits the scale to the data and then widens it by `marginPx` at each end.
+ * uPlot clips series to the plot area, so a dot at the extreme value would
+ * otherwise lose the half that hangs past the edge. Log scales are left
+ * unsnapped: rounding out to the next power of ten after the margin can add a
+ * whole empty decade.
+ */
+export function createScatterRange({
+	dimension,
+	marginPx,
+	softMin,
+	softMax,
+	...distribution
+}: ScatterRangeOptions): uPlot.Scale.Range {
+	const transform = getScaleTransform(distribution);
+	const isLog = distribution.distribution === DistributionType.Logarithmic;
+
+	// A log scale cannot place a soft limit at or below zero.
+	const usableSoftMin = isLog && (softMin ?? 0) <= 0 ? null : softMin;
+
+	return (u, dataMin, dataMax): uPlot.Range.MinMax => {
+		const extent = resolveExtent(dataMin, dataMax, usableSoftMin, softMax);
+		if (!extent) {
+			return isLog ? [1, 10] : [0, 1];
+		}
+
+		let start = transform.forward(extent[0]);
+		let end = transform.forward(extent[1]);
+		if (start === end) {
+			start -= SINGLE_VALUE_HALF_SPAN;
+			end += SINGLE_VALUE_HALF_SPAN;
+		}
+
+		const plotPx =
+			(dimension === 'x' ? u.bbox.width : u.bbox.height) / uPlot.pxRatio;
+		if (plotPx > 2 * marginPx) {
+			const pad = ((end - start) * marginPx) / (plotPx - 2 * marginPx);
+			start -= pad;
+			end += pad;
+		}
+
+		return [transform.inverse(start), transform.inverse(end)];
+	};
+}

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

@@ -0,0 +1,328 @@
+import { PrecisionOption } from 'components/Graph/types';
+import {
+	type AxisProps,
+	DistributionType,
+	DrawStyle,
+	SelectionPreferencesSource,
+} from 'lib/uPlotV2/config/types';
+import { UPlotConfigBuilder } from 'lib/uPlotV2/config/UPlotConfigBuilder';
+import { Threshold } from 'lib/uPlotV2/hooks/types';
+import {
+	applyScatterPlugin,
+	createScatterPlugin,
+	SCATTER_FACETS,
+} from 'lib/uPlotV2/plugins/ScatterPlugin/scatterPlugin';
+import {
+	DEFAULT_SCATTER_POINT_SIZE,
+	ScatterChartData,
+	ScatterPointSize,
+	ScatterSeriesData,
+} from 'lib/uPlotV2/plugins/ScatterPlugin/types';
+import {
+	logScaleSplits,
+	spacedLogLabels,
+} from 'lib/uPlotV2/utils/logGridSplits';
+import { adjustSoftLimitsWithThresholds } from 'lib/uPlotV2/utils/scale';
+import uPlot from 'uplot';
+
+import { createScatterRange } from './scatterRange';
+
+/** Circle outline; the fill carries the colour. */
+const POINT_STROKE_WIDTH = 1;
+
+/** Unit-suffixed x labels are wider than uPlot's 50px default assumes. */
+const X_AXIS_TICK_SPACE_PX = 90;
+const X_AXIS_END_LABEL_PADDING_PX = 40;
+
+export interface ScatterSeries {
+	/** Group label, as the legend names it. */
+	label: string;
+	xs: number[];
+	ys: number[];
+	/** Optional third channel, in the caller's units. */
+	sizes?: Array<number | null>;
+}
+
+export enum ScatterAxisScale {
+	/** Log when the values are positive and span several decades, else linear. */
+	Auto = 'auto',
+	Linear = 'linear',
+	Log = 'log',
+	/** Log-like, but places zero and negatives. */
+	SymLog = 'symlog',
+}
+
+/** Decades of positive values `auto` needs before it picks a log axis. */
+export const AUTO_LOG_MIN_DECADES = 3;
+
+export interface ScatterAxisOptions {
+	/** Axis title. */
+	label?: string;
+	unit?: string;
+	softMin?: number | null;
+	softMax?: number | null;
+	scale?: ScatterAxisScale;
+}
+
+export interface BuildScatterConfigArgs {
+	id: string;
+	series: ScatterSeries[];
+	isDarkMode: boolean;
+	x: ScatterAxisOptions;
+	y: ScatterAxisOptions;
+	pointSize?: ScatterPointSize;
+	/** 0–1. */
+	fillOpacity?: number;
+	colorMapping?: Record<string, string>;
+	/** Drawn on the y axis. */
+	thresholds?: Threshold[];
+	decimalPrecision?: PrecisionOption;
+	selectionPreferencesSource?: SelectionPreferencesSource;
+	shouldSaveSelectionPreference?: boolean;
+}
+
+/**
+ * The dot under the cursor, read off uPlot's cursor: the scatter plugin's
+ * `dataIdx` answers only for the hit series, so its index is the one set.
+ */
+export function getCursorHit(
+	plot: uPlot,
+): { seriesIndex: number; dataIndex: number } | null {
+	const idxs = plot.cursor.idxs ?? [];
+	for (let seriesIndex = 1; seriesIndex < idxs.length; seriesIndex++) {
+		const dataIndex = idxs[seriesIndex];
+		if (dataIndex != null) {
+			return { seriesIndex, dataIndex };
+		}
+	}
+	return null;
+}
+
+/** `[null, [xs, ys, sizes?], …]`: uPlot's faceted layout, series 0 empty. */
+export function prepareScatterChartData(
+	series: ScatterSeries[],
+): uPlot.AlignedData {
+	const data: ScatterChartData = [
+		null,
+		...series.map(
+			(entry): ScatterSeriesData =>
+				entry.sizes ? [entry.xs, entry.ys, entry.sizes] : [entry.xs, entry.ys],
+		),
+	];
+	return data as unknown as uPlot.AlignedData;
+}
+
+export interface AxisDistribution {
+	distribution: DistributionType;
+	asinhThreshold?: number;
+}
+
+function getPositiveRange(values: number[]): {
+	minPositive: number;
+	maxPositive: number;
+	hasNonPositive: boolean;
+} {
+	let minPositive = Infinity;
+	let maxPositive = -Infinity;
+	let hasNonPositive = false;
+	for (const value of values) {
+		if (!Number.isFinite(value)) {
+			continue;
+		}
+		if (value <= 0) {
+			hasNonPositive = true;
+		} else {
+			minPositive = Math.min(minPositive, value);
+			maxPositive = Math.max(maxPositive, value);
+		}
+	}
+	return { minPositive, maxPositive, hasNonPositive };
+}
+
+/**
+ * The symmetric log's linear band ends at the smallest non-zero magnitude, so
+ * the small values still spread out.
+ */
+function symmetricLogDistribution(minPositive: number): AxisDistribution {
+	const asinhThreshold = Number.isFinite(minPositive)
+		? 10 ** Math.floor(Math.log10(minPositive))
+		: 1;
+	return { distribution: DistributionType.SymmetricLog, asinhThreshold };
+}
+
+/**
+ * A plain log axis cannot place zero or negatives, so `log` falls back to the
+ * symmetric log rather than lose those points; callers that would rather drop
+ * them filter first.
+ */
+export function resolveAxisDistribution(
+	values: number[],
+	scale: ScatterAxisScale = ScatterAxisScale.Auto,
+	/**
+	 * Soft limits (and thresholds) the axis must reach. Only `auto` weighs them:
+	 * a soft min at or below zero rules out log. An explicit scale keeps its
+	 * choice, and a log axis drops a bound it cannot place.
+	 */
+	softLimits: Array<number | null | undefined> = [],
+): AxisDistribution {
+	const { minPositive, hasNonPositive } = getPositiveRange(values);
+	switch (scale) {
+		case ScatterAxisScale.Linear:
+			return { distribution: DistributionType.Linear };
+		case ScatterAxisScale.SymLog:
+			return symmetricLogDistribution(minPositive);
+		case ScatterAxisScale.Log:
+			return hasNonPositive
+				? symmetricLogDistribution(minPositive)
+				: { distribution: DistributionType.Logarithmic };
+		case ScatterAxisScale.Auto:
+		default: {
+			const extent = getPositiveRange([
+				...values,
+				...softLimits.filter((limit): limit is number => limit != null),
+			]);
+			const spansDecades =
+				Number.isFinite(extent.minPositive) &&
+				Math.log10(extent.maxPositive / extent.minPositive) >= AUTO_LOG_MIN_DECADES;
+			return !extent.hasNonPositive && spansDecades
+				? { distribution: DistributionType.Logarithmic }
+				: { distribution: DistributionType.Linear };
+		}
+	}
+}
+
+/** The scatter range is unsnapped, so a log axis places and labels its own ticks. */
+function getLogAxisTicks({
+	distribution,
+}: AxisDistribution): Pick<AxisProps, 'splits' | 'filter'> {
+	return distribution === DistributionType.Logarithmic
+		? { splits: logScaleSplits, filter: spacedLogLabels }
+		: {};
+}
+
+export function buildScatterConfig({
+	id,
+	series,
+	isDarkMode,
+	x,
+	y,
+	pointSize = DEFAULT_SCATTER_POINT_SIZE,
+	fillOpacity,
+	colorMapping = {},
+	thresholds,
+	decimalPrecision,
+	selectionPreferencesSource,
+	shouldSaveSelectionPreference,
+}: BuildScatterConfigArgs): UPlotConfigBuilder {
+	const builder = new UPlotConfigBuilder({
+		id,
+		selectionPreferencesSource,
+		shouldSaveSelectionPreference,
+	});
+
+	const plugin = createScatterPlugin({ pointSize });
+	applyScatterPlugin(builder, plugin);
+	// The last x label is centred on the plot's right edge; room for its unit.
+	builder.setPadding([16, X_AXIS_END_LABEL_PADDING_PX, 8, 8]);
+
+	const ySoftLimits = adjustSoftLimitsWithThresholds(
+		y.softMin ?? null,
+		y.softMax ?? null,
+		thresholds,
+		y.unit,
+	);
+	const xDistribution = resolveAxisDistribution(
+		series.flatMap((entry) => entry.xs),
+		x.scale,
+		[x.softMin, x.softMax],
+	);
+	const yDistribution = resolveAxisDistribution(
+		series.flatMap((entry) => entry.ys),
+		y.scale,
+		[ySoftLimits.softMin, ySoftLimits.softMax],
+	);
+
+	const yThresholds =
+		thresholds && thresholds.length > 0
+			? { scaleKey: 'y', thresholds, yAxisUnit: y.unit }
+			: undefined;
+
+	// The largest disc drawn, plus its outline, kept clear of each plot edge.
+	const largestDiameter = series.some((entry) => entry.sizes)
+		? pointSize.max
+		: pointSize.fixed;
+	const marginPx = largestDiameter / 2 + POINT_STROKE_WIDTH;
+
+	builder.addScale({
+		scaleKey: 'x',
+		time: false,
+		softMin: x.softMin ?? undefined,
+		softMax: x.softMax ?? undefined,
+		range: createScatterRange({
+			dimension: 'x',
+			marginPx,
+			softMin: x.softMin,
+			softMax: x.softMax,
+			...xDistribution,
+		}),
+		...xDistribution,
+	});
+	builder.addScale({
+		scaleKey: 'y',
+		time: false,
+		softMin: y.softMin ?? undefined,
+		softMax: y.softMax ?? undefined,
+		thresholds: yThresholds,
+		range: createScatterRange({
+			dimension: 'y',
+			marginPx,
+			...ySoftLimits,
+			...yDistribution,
+		}),
+		...yDistribution,
+	});
+
+	builder.addAxis({
+		scaleKey: 'x',
+		side: 2,
+		label: x.label || undefined,
+		isDarkMode,
+		isTimeAxis: false,
+		yAxisUnit: x.unit ?? '',
+		decimalPrecision,
+		isLogScale: xDistribution.distribution !== DistributionType.Linear,
+		...getLogAxisTicks(xDistribution),
+		space: X_AXIS_TICK_SPACE_PX,
+	});
+	builder.addAxis({
+		scaleKey: 'y',
+		side: 3,
+		label: y.label || undefined,
+		isDarkMode,
+		yAxisUnit: y.unit ?? '',
+		decimalPrecision,
+		isLogScale: yDistribution.distribution !== DistributionType.Linear,
+		...getLogAxisTicks(yDistribution),
+	});
+
+	series.forEach((entry) => {
+		builder.addSeries({
+			scaleKey: 'y',
+			label: entry.label,
+			colorMapping,
+			drawStyle: DrawStyle.Scatter,
+			pathBuilder: plugin.pathBuilder,
+			facets: SCATTER_FACETS,
+			lineWidth: POINT_STROKE_WIDTH,
+			pointSize: pointSize.fixed,
+			fillOpacity,
+			isDarkMode,
+		});
+	});
+
+	if (yThresholds) {
+		builder.addThresholds(yThresholds);
+	}
+
+	return builder;
+}

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

@@ -16,6 +16,10 @@ import type {
 	HeatmapColorOptions,
 	HeatmapSeries,
 } from 'lib/uPlotV2/plugins/HeatmapPlugin/types';
+import type {
+	ScatterChannels,
+	ScatterPointLabel,
+} from 'lib/uPlotV2/plugins/ScatterPlugin/types';
 import {
 	DashboardCursorSync,
 	SyncTooltipFilterMode,
@@ -88,6 +92,27 @@ export interface HistogramChartProps extends ChartWrapperProps {
 	isQueriesMerged?: boolean;
 }
 
+/** The dot a click landed on; `seriesIndex` is uPlot's, so the first series is 1. */
+export interface ScatterPointClick {
+	seriesIndex: number;
+	dataIndex: number;
+	/** The series' drawn colour. */
+	color: string;
+	/** Viewport coordinates of the click. */
+	coordinates: { x: number; y: number };
+}
+
+/** `data` is mode-2 (`prepareScatterChartData`); `config` comes from `buildScatterConfig`. */
+export interface ScatterChartProps extends ChartWrapperProps {
+	channels: ScatterChannels;
+	resolvePointLabels?: (
+		seriesIndex: number,
+		dataIndex: number,
+	) => ScatterPointLabel[];
+	/** Fires for a click on a dot; a click on empty plot space fires nothing. */
+	onPointClick?: (click: ScatterPointClick) => void;
+}
+
 /**
  * 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

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

@@ -40,6 +40,8 @@ interface ConfigPaneProps {
 	legendSeries: LegendSeries[];
 	/** Table panel's resolved value columns, for the table-only editors. */
 	tableColumns: TableColumnOption[];
+	/** Group-by labels of a joined scalar result, for the scatter dimensions editor. */
+	groupColumns?: string[];
 	/** Query step interval (seconds), for the chart-appearance span-gaps floor. */
 	stepInterval?: number;
 	/**
@@ -67,6 +69,7 @@ function ConfigPane({
 	queryType,
 	legendSeries,
 	tableColumns,
+	groupColumns,
 	stepInterval,
 	panel,
 	panelId,
@@ -136,6 +139,7 @@ function ConfigPane({
 						defaults={defaults}
 						legendSeries={legendSeries}
 						tableColumns={tableColumns}
+						groupColumns={groupColumns}
 						signal={signal}
 						panelKind={panelKind}
 						onChangePanelKind={onChangePanelKind}
@@ -163,6 +167,7 @@ function ConfigPane({
 									defaults={defaults}
 									legendSeries={legendSeries}
 									tableColumns={tableColumns}
+									groupColumns={groupColumns}
 									signal={signal}
 									panelKind={panelKind}
 									onChangePanelKind={onChangePanelKind}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/SectionSlot/SectionSlot.tsx

@@ -12,6 +12,8 @@ import type { SectionEditorContext } from '../sectionContext';
 import { getSectionDefault, resolveSectionEditor } from '../sectionRegistry';
 import SettingsSection from '../SettingsSection/SettingsSection';
 import { isDifferent } from '../utils/changes';
+import { getScatterAxisColumnNames } from '../utils/scatterAxisColumns';
+import { getSizeColumnLabel } from '../utils/sizeColumnLabel';
 import SectionHeaderQuickAdd from './SectionHeaderQuickAdd';
 
 type SectionSlotProps = {
@@ -63,6 +65,7 @@ function SectionSlot({
 	bare,
 	legendSeries,
 	tableColumns,
+	groupColumns,
 	signal,
 	panelKind,
 	onChangePanelKind,
@@ -74,7 +77,10 @@ function SectionSlot({
 	const editor = resolveSectionEditor(config.kind);
 	// Controlled so the header slot can expand on click; list sections open when populated.
 	const [open, setOpen] = useState(() => {
-		if (config.kind === SectionKind.Visualization) {
+		if (
+			config.kind === SectionKind.Visualization ||
+			config.kind === SectionKind.Dimensions
+		) {
 			return true;
 		}
 		const value = editor?.get(spec);
@@ -129,6 +135,9 @@ function SectionSlot({
 		legendSeries,
 		yAxisUnit,
 		tableColumns,
+		groupColumns,
+		sizeColumnLabel: getSizeColumnLabel(spec, tableColumns),
+		axisColumnNames: getScatterAxisColumnNames(spec, tableColumns),
 		signal,
 		panelKind,
 		onChangePanelKind,

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/controls/ConfigMultiSelect/ConfigMultiSelect.module.scss

@@ -0,0 +1,12 @@
+.select {
+	width: 100%;
+
+	:global(.ant-select-selector) {
+		border-color: var(--l2-border) !important;
+	}
+
+	:global(.ant-select-selection-item) {
+		font-family: 'Geist Mono', monospace;
+		font-size: 12px;
+	}
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/controls/ConfigMultiSelect/ConfigMultiSelect.tsx

@@ -0,0 +1,57 @@
+import { Select } from 'antd';
+
+import styles from './ConfigMultiSelect.module.scss';
+
+export interface ConfigMultiSelectItem<T extends string = string> {
+	value: T;
+	label: string;
+}
+
+interface ConfigMultiSelectProps<T extends string = string> {
+	testId: string;
+	value: T[];
+	/** Shown while nothing is selected, which is a valid choice. */
+	placeholder?: string;
+	items: ConfigMultiSelectItem<T>[];
+	onChange: (value: T[]) => void;
+	disabled?: boolean;
+	'aria-label'?: string;
+}
+
+/**
+ * Multi-select for the config sections; the picks show as tags. The order of
+ * `items` is kept rather than the order they were picked in, so the same set
+ * always reads (and is stored) the same way.
+ */
+function ConfigMultiSelect<T extends string = string>({
+	testId,
+	value,
+	placeholder,
+	items,
+	onChange,
+	disabled,
+	'aria-label': ariaLabel,
+}: ConfigMultiSelectProps<T>): JSX.Element {
+	return (
+		<Select<T[]>
+			mode="multiple"
+			className={styles.select}
+			data-testid={testId}
+			aria-label={ariaLabel}
+			value={value}
+			placeholder={placeholder}
+			disabled={disabled}
+			virtual={false}
+			options={items}
+			onChange={(next): void =>
+				onChange(
+					items
+						.map((item) => item.value)
+						.filter((candidate) => next.includes(candidate)),
+				)
+			}
+		/>
+	);
+}
+
+export default ConfigMultiSelect;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/controls/ConfigMultiSelect/__tests__/ConfigMultiSelect.test.tsx

@@ -0,0 +1,52 @@
+import { render, screen, userEvent } from 'tests/test-utils';
+
+import ConfigMultiSelect from '../ConfigMultiSelect';
+
+const ITEMS = [
+	{ value: 'a', label: 'alpha' },
+	{ value: 'b', label: 'beta' },
+	{ value: 'c', label: 'gamma' },
+];
+
+async function open(): Promise<ReturnType<typeof userEvent.setup>> {
+	const user = userEvent.setup();
+	await user.click(
+		screen
+			.getByTestId('multi')
+			.querySelector('.ant-select-selector') as HTMLElement,
+	);
+	return user;
+}
+
+describe('ConfigMultiSelect', () => {
+	it('shows the placeholder while nothing is picked', () => {
+		render(
+			<ConfigMultiSelect
+				testId="multi"
+				value={[]}
+				placeholder="Every group key"
+				items={ITEMS}
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(screen.getByText('Every group key')).toBeInTheDocument();
+	});
+
+	it('keeps picks in item order, not the order they were picked', async () => {
+		const onChange = jest.fn();
+		render(
+			<ConfigMultiSelect
+				testId="multi"
+				value={['c']}
+				items={ITEMS}
+				onChange={onChange}
+			/>,
+		);
+
+		const user = await open();
+		await user.click(await screen.findByRole('option', { name: 'alpha' }));
+
+		expect(onChange).toHaveBeenLastCalledWith(['a', 'c']);
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/controls/ConfigRangeSlider/ConfigRangeSlider.module.scss

@@ -0,0 +1,23 @@
+.row {
+	display: flex;
+	align-items: center;
+	gap: 12px;
+}
+
+.slider {
+	flex: 1;
+	min-width: 0;
+	// The design-system slider insets its track by half a thumb on each side so the
+	// fill follows the thumb's centre. Pull that inset back off the row so the track
+	// lines up with the other controls; the thumb never paints past the track edge.
+	margin-inline: calc(var(--slider-thumb-width, 18px) / -2);
+}
+
+.value {
+	flex-shrink: 0;
+	min-width: 56px;
+	text-align: right;
+	font-size: 12px;
+	font-variant-numeric: tabular-nums;
+	color: var(--l3-foreground);
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/controls/ConfigRangeSlider/ConfigRangeSlider.tsx

@@ -0,0 +1,49 @@
+import { Slider } from '@signozhq/ui/slider';
+
+import styles from './ConfigRangeSlider.module.scss';
+
+interface ConfigRangeSliderProps {
+	testId: string;
+	value: [number, number];
+	min: number;
+	max: number;
+	step: number;
+	/** Renders the current range beside the track (e.g. `4–24 px`). */
+	formatValue?: (value: [number, number]) => string;
+	onChange: (value: [number, number]) => void;
+}
+
+/** Two-thumb slider for a min/max pair; the thumbs can meet but not cross. */
+function ConfigRangeSlider({
+	testId,
+	value,
+	min,
+	max,
+	step,
+	formatValue,
+	onChange,
+}: ConfigRangeSliderProps): JSX.Element {
+	return (
+		<div className={styles.row}>
+			<Slider
+				range
+				testId={testId}
+				className={styles.slider}
+				value={value}
+				min={min}
+				max={max}
+				step={step}
+				onChange={(next): void => {
+					if (Array.isArray(next) && next.length === 2) {
+						onChange([Math.min(next[0], next[1]), Math.max(next[0], next[1])]);
+					}
+				}}
+			/>
+			<span className={styles.value}>
+				{formatValue ? formatValue(value) : `${value[0]}–${value[1]}`}
+			</span>
+		</div>
+	);
+}
+
+export default ConfigRangeSlider;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/controls/ConfigRangeSlider/__tests__/ConfigRangeSlider.test.tsx

@@ -0,0 +1,51 @@
+import { render, screen, userEvent } from 'tests/test-utils';
+
+import ConfigRangeSlider from '../ConfigRangeSlider';
+
+window.ResizeObserver =
+	window.ResizeObserver ||
+	jest.fn().mockImplementation(() => ({
+		disconnect: jest.fn(),
+		observe: jest.fn(),
+		unobserve: jest.fn(),
+	}));
+
+describe('ConfigRangeSlider', () => {
+	it('renders a thumb per end and the formatted range', () => {
+		render(
+			<ConfigRangeSlider
+				testId="range"
+				value={[4, 24]}
+				min={2}
+				max={40}
+				step={1}
+				formatValue={([min, max]): string => `${min}–${max} px`}
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(screen.getAllByRole('slider')).toHaveLength(2);
+		expect(screen.getByText('4–24 px')).toBeInTheDocument();
+	});
+
+	it('moves one end and reports the pair low to high', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ConfigRangeSlider
+				testId="range"
+				value={[4, 24]}
+				min={2}
+				max={40}
+				step={1}
+				onChange={onChange}
+			/>,
+		);
+
+		const [, maxThumb] = screen.getAllByRole('slider');
+		maxThumb.focus();
+		await user.keyboard('{ArrowRight}');
+
+		expect(onChange).toHaveBeenLastCalledWith([4, 25]);
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sectionContext.ts

@@ -13,6 +13,12 @@ import { EQueryType } from 'types/common/dashboard';
 export interface SectionEditorContext {
 	legendSeries?: LegendSeries[];
 	tableColumns?: TableColumnOption[];
+	/** Group-by labels of the joined scalar result; the colour-by options. */
+	groupColumns?: string[];
+	/** Label of the value column a Scatter Plot sizes its dots by; unset when none is. */
+	sizeColumnLabel?: string;
+	/** Name of the column each Scatter Plot axis plots, for its label's placeholder. */
+	axisColumnNames?: { x?: string; y?: string };
 	signal?: TelemetrytypesSignalDTO;
 	panelKind?: PanelKind;
 	onChangePanelKind?: (kind: PanelKind) => void;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sectionRegistry.tsx

@@ -4,6 +4,8 @@ import type {
 	DashboardtypesHistogramBucketsDTO,
 	DashboardtypesLegendDTO,
 	DashboardtypesPanelSpecDTO,
+	DashboardtypesScatterPlotAxesDTO,
+	DashboardtypesScatterPlotDimensionsDTO,
 } from 'api/generated/services/sigNoz.schemas';
 import {
 	SectionKind,
@@ -22,9 +24,11 @@ import AxesSection from './sections/AxesSection/AxesSection';
 import BucketsSection from './sections/BucketsSection/BucketsSection';
 import ChartAppearanceSection from './sections/ChartAppearanceSection/ChartAppearanceSection';
 import ContextLinksSection from './sections/ContextLinksSection/ContextLinksSection';
+import DimensionsSection from './sections/DimensionsSection/DimensionsSection';
 import FormattingSection from './sections/FormattingSection/FormattingSection';
 import LegendSection from './sections/LegendSection/LegendSection';
 import PanelHeaderSection from './sections/PanelHeaderSection/PanelHeaderSection';
+import ScatterAxesSection from './sections/ScatterAxesSection/ScatterAxesSection';
 import TextLayoutSection from './sections/TextLayoutSection/TextLayoutSection';
 import ThresholdsSection from './sections/ThresholdsSection/ThresholdsSection';
 import VisualizationSection from './sections/VisualizationSection/VisualizationSection';
@@ -86,6 +90,20 @@ export const SECTION_REGISTRY: {
 			getPluginSlice<PanelAxesSlice>(spec, 'axes'),
 		update: (spec, axes): PanelSpec => updatePluginSlice(spec, 'axes', axes),
 	},
+	// Same `axes` key as above, in Scatter Plot's per-axis shape.
+	[SectionKind.ScatterAxes]: {
+		Component: ScatterAxesSection,
+		get: (spec): DashboardtypesScatterPlotAxesDTO | undefined =>
+			getPluginSlice<DashboardtypesScatterPlotAxesDTO>(spec, 'axes'),
+		update: (spec, axes): PanelSpec => updatePluginSlice(spec, 'axes', axes),
+	},
+	[SectionKind.Dimensions]: {
+		Component: DimensionsSection,
+		get: (spec): DashboardtypesScatterPlotDimensionsDTO | undefined =>
+			getPluginSlice<DashboardtypesScatterPlotDimensionsDTO>(spec, 'dimensions'),
+		update: (spec, dimensions): PanelSpec =>
+			updatePluginSlice(spec, 'dimensions', dimensions),
+	},
 	[SectionKind.Legend]: {
 		Component: LegendSection,
 		get: (spec): DashboardtypesLegendDTO | undefined =>

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ChartAppearanceSection/ChartAppearanceSection.tsx

@@ -14,6 +14,7 @@ import type { SectionEditorContext } from '../../sectionContext';
 import { createFieldResetter } from '../../utils/changes';
 import DisconnectValuesField from './DisconnectValuesField';
 import HeatmapColorsField from './HeatmapColorsField';
+import PointsFields from './PointsFields';
 import {
 	FILL_MODE_OPTIONS,
 	FILLED_FILL_MODE_OPTIONS,
@@ -39,8 +40,9 @@ function ChartAppearanceSection({
 	controls,
 	onChange,
 	stepInterval,
+	sizeColumnLabel,
 }: SectionEditorProps<SectionKind.ChartAppearance> &
-	Pick<SectionEditorContext, 'stepInterval'>): JSX.Element {
+	Pick<SectionEditorContext, 'stepInterval' | 'sizeColumnLabel'>): JSX.Element {
 	const reset = createFieldResetter(value, savedValue, onChange);
 	const interpolation = value?.lineInterpolation;
 
@@ -122,6 +124,15 @@ function ChartAppearanceSection({
 				/>
 			)}
 
+			{controls.points && (
+				<PointsFields
+					value={value?.points}
+					savedValue={savedValue?.points}
+					sizeColumnLabel={sizeColumnLabel}
+					onChange={(points): void => onChange({ ...value, points })}
+				/>
+			)}
+
 			{controls.spanGaps && (
 				<DisconnectValuesField
 					testId="panel-editor-v2-span-gaps"

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ChartAppearanceSection/PointsFields.tsx

@@ -0,0 +1,87 @@
+import type { DashboardtypesScatterPlotPointsDTO } from 'api/generated/services/sigNoz.schemas';
+import {
+	POINT_OPACITY_BOUNDS,
+	POINT_SIZE_BOUNDS,
+	resolvePointOpacity,
+	resolvePointSize,
+} from 'pages/DashboardPage/DashboardContainer/Panels/kinds/ScatterPlotPanel/utils/points';
+
+import ConfigField from '../../controls/ConfigField/ConfigField';
+import ConfigRangeSlider from '../../controls/ConfigRangeSlider/ConfigRangeSlider';
+import ConfigSlider from '../../controls/ConfigSlider/ConfigSlider';
+import { createFieldResetter } from '../../utils/changes';
+import { formatOpacity, formatPointSize, formatPointSizeRange } from './utils';
+
+const OPACITY_STEP = 0.01;
+
+interface PointsFieldsProps {
+	value: DashboardtypesScatterPlotPointsDTO | undefined;
+	savedValue: DashboardtypesScatterPlotPointsDTO | undefined;
+	onChange: (next: DashboardtypesScatterPlotPointsDTO) => void;
+	/** The column dots are sized by; unset draws every dot at one size. */
+	sizeColumnLabel?: string;
+}
+
+function PointsFields({
+	value,
+	savedValue,
+	onChange,
+	sizeColumnLabel,
+}: PointsFieldsProps): JSX.Element {
+	const reset = createFieldResetter(value, savedValue, onChange);
+	// The renderer's defaults, so a thumb starts where an unset field draws.
+	const size = resolvePointSize(value);
+
+	return (
+		<>
+			{sizeColumnLabel ? (
+				<ConfigField
+					label="Point size"
+					help={`Each dot's area scales with ${sizeColumnLabel} between min and max.`}
+					{...reset('minSize', 'maxSize')}
+				>
+					<ConfigRangeSlider
+						testId="panel-editor-v2-point-size-range"
+						value={[size.min, size.max]}
+						min={POINT_SIZE_BOUNDS.min}
+						max={POINT_SIZE_BOUNDS.max}
+						step={1}
+						formatValue={formatPointSizeRange}
+						onChange={([minSize, maxSize]): void =>
+							onChange({ ...value, minSize, maxSize })
+						}
+					/>
+				</ConfigField>
+			) : (
+				<ConfigField
+					label="Point size"
+					help="Every dot uses this size. Map a Size column to draw a bubble chart."
+					{...reset('size')}
+				>
+					<ConfigSlider
+						testId="panel-editor-v2-point-size"
+						value={size.fixed}
+						min={POINT_SIZE_BOUNDS.min}
+						max={POINT_SIZE_BOUNDS.max}
+						step={1}
+						formatValue={formatPointSize}
+						onChange={(next): void => onChange({ ...value, size: next })}
+					/>
+				</ConfigField>
+			)}
+			<ConfigField label="Fill opacity" {...reset('opacity')}>
+				<ConfigSlider
+					testId="panel-editor-v2-point-opacity"
+					value={resolvePointOpacity(value)}
+					min={POINT_OPACITY_BOUNDS.min}
+					max={POINT_OPACITY_BOUNDS.max}
+					step={OPACITY_STEP}
+					formatValue={formatOpacity}
+					onChange={(opacity): void => onChange({ ...value, opacity })}
+				/>
+			</ConfigField>
+		</>
+	);
+}
+
+export default PointsFields;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ChartAppearanceSection/__tests__/PointsFields.test.tsx

@@ -0,0 +1,114 @@
+import { render, screen, userEvent } from 'tests/test-utils';
+
+import ChartAppearanceSection from '../ChartAppearanceSection';
+
+window.ResizeObserver =
+	window.ResizeObserver ||
+	jest.fn().mockImplementation(() => ({
+		disconnect: jest.fn(),
+		observe: jest.fn(),
+		unobserve: jest.fn(),
+	}));
+
+describe('ChartAppearanceSection points', () => {
+	it('offers one point size when nothing sizes the dots', () => {
+		render(
+			<ChartAppearanceSection
+				value={undefined}
+				controls={{ points: true }}
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-point-size')).toBeInTheDocument();
+		expect(
+			screen.queryByTestId('panel-editor-v2-point-size-range'),
+		).not.toBeInTheDocument();
+		expect(screen.getByText('6 px')).toBeInTheDocument();
+		expect(
+			screen.getByText(
+				'Every dot uses this size. Map a Size column to draw a bubble chart.',
+			),
+		).toBeInTheDocument();
+		expect(screen.getByText('70%')).toBeInTheDocument();
+	});
+
+	it('offers a min/max range named after the size column when one is bound', () => {
+		render(
+			<ChartAppearanceSection
+				value={{ points: { minSize: 5 } }}
+				controls={{ points: true }}
+				sizeColumnLabel="B.count()"
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(
+			screen.getByTestId('panel-editor-v2-point-size-range'),
+		).toBeInTheDocument();
+		expect(
+			screen.queryByTestId('panel-editor-v2-point-size'),
+		).not.toBeInTheDocument();
+		expect(screen.getByText('5–24 px')).toBeInTheDocument();
+		expect(
+			screen.getByText(
+				"Each dot's area scales with B.count() between min and max.",
+			),
+		).toBeInTheDocument();
+	});
+
+	it('steps the fixed size by a whole pixel, keeping the range', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ChartAppearanceSection
+				value={{ points: { size: 6, minSize: 4, maxSize: 30 } }}
+				controls={{ points: true }}
+				onChange={onChange}
+			/>,
+		);
+
+		const [sizeThumb] = screen.getAllByRole('slider');
+		sizeThumb.focus();
+		await user.keyboard('{ArrowRight}');
+
+		expect(onChange).toHaveBeenLastCalledWith({
+			points: { size: 7, minSize: 4, maxSize: 30 },
+		});
+	});
+
+	it('stops the opacity at 10%', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ChartAppearanceSection
+				value={{ points: { opacity: 0.1 } }}
+				controls={{ points: true }}
+				onChange={onChange}
+			/>,
+		);
+
+		const thumbs = screen.getAllByRole('slider');
+		const opacityThumb = thumbs[thumbs.length - 1];
+		expect(opacityThumb).toHaveAttribute('aria-valuemin', '0.1');
+		opacityThumb.focus();
+		await user.keyboard('{ArrowLeft}');
+
+		expect(onChange).not.toHaveBeenCalled();
+	});
+
+	it('leaves the points out of a kind that does not declare them', () => {
+		render(
+			<ChartAppearanceSection
+				value={undefined}
+				controls={{ lineStyle: true }}
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(
+			screen.queryByTestId('panel-editor-v2-point-size'),
+		).not.toBeInTheDocument();
+		expect(screen.queryByText('Fill opacity')).not.toBeInTheDocument();
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ChartAppearanceSection/utils.ts

@@ -12,3 +12,11 @@ export function defaultDisconnectDuration(stepInterval?: number): string {
 export function formatOpacity(opacity: number): string {
 	return `${Math.round(opacity * 100)}%`;
 }
+
+export function formatPointSize(size: number): string {
+	return `${size} px`;
+}
+
+export function formatPointSizeRange([min, max]: [number, number]): string {
+	return `${min}–${max} px`;
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/DimensionsSection/DimensionsSection.module.scss

@@ -0,0 +1,30 @@
+.section {
+	display: flex;
+	flex-direction: column;
+	gap: 18px;
+}
+
+.labelWithInfo {
+	display: inline-flex;
+	align-items: center;
+	gap: 6px;
+}
+
+.info {
+	display: inline-flex;
+	color: var(--l3-foreground);
+	cursor: help;
+}
+
+.infoTooltip {
+	max-width: 240px;
+	white-space: normal;
+	word-break: break-word;
+}
+
+.description {
+	margin: 0;
+	color: var(--l2-foreground);
+	font-size: 12px;
+	line-height: 17px;
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/DimensionsSection/DimensionsSection.tsx

@@ -0,0 +1,117 @@
+import { useMemo } from 'react';
+import type {
+	SectionEditorProps,
+	SectionKind,
+} from 'pages/DashboardPage/DashboardContainer/Panels/types/sections';
+
+import ConfigField from '../../controls/ConfigField/ConfigField';
+import ConfigMultiSelect from '../../controls/ConfigMultiSelect/ConfigMultiSelect';
+import ConfigSelect from '../../controls/ConfigSelect/ConfigSelect';
+import type { SectionEditorContext } from '../../sectionContext';
+import { resolveAutoAxes } from '../../utils/scatterAxisColumns';
+
+import styles from './DimensionsSection.module.scss';
+import LabelWithInfo from './LabelWithInfo';
+import {
+	buildColorKeyItems,
+	buildDimensionItems,
+	formatAutoOption,
+	formatColumnOption,
+	UNSET_DIMENSION,
+} from './utils';
+
+type DimensionsSectionProps = SectionEditorProps<SectionKind.Dimensions> &
+	Pick<SectionEditorContext, 'tableColumns' | 'groupColumns'>;
+
+const FIELD_INFO = {
+	x: 'The value column that places each dot left to right. Auto takes the first value column.',
+	y: "The value column that places each dot bottom to top. Auto takes the first value column X doesn't use.",
+	sizeBy:
+		"Optional. Scales each dot's area by this value column; a group without a value draws at the default size.",
+	colorBy:
+		'One color and legend entry per combination of the selected keys. Leave it empty to color by every group key.',
+};
+
+/**
+ * Edits the `dimensions` slice of a Scatter Plot: which value column each axis
+ * and the dot size read, and which group-by keys colour the dots. Options come
+ * from the preview query's joined result.
+ */
+function DimensionsSection({
+	value,
+	onChange,
+	tableColumns = [],
+	groupColumns = [],
+}: DimensionsSectionProps): JSX.Element {
+	const valueItems = useMemo(
+		() =>
+			tableColumns.map((column) => ({
+				value: column.key,
+				label: formatColumnOption(column),
+			})),
+		[tableColumns],
+	);
+	const autoAxes = resolveAutoAxes(tableColumns, {
+		x: value?.x,
+		y: value?.y,
+	});
+	const colorBy = value?.colorBy ?? [];
+	const colorItems = buildColorKeyItems(groupColumns, colorBy);
+
+	const fields = [
+		{ dimension: 'x', label: 'X axis', unsetLabel: formatAutoOption(autoAxes.x) },
+		{ dimension: 'y', label: 'Y axis', unsetLabel: formatAutoOption(autoAxes.y) },
+		{ dimension: 'sizeBy', label: 'Size by', unsetLabel: 'None' },
+	] as const;
+
+	return (
+		<div className={styles.section}>
+			{fields.map(({ dimension, label, unsetLabel }) => (
+				<ConfigField
+					key={dimension}
+					label={
+						<LabelWithInfo
+							label={label}
+							info={FIELD_INFO[dimension]}
+							testId={`panel-editor-v2-dimension-${dimension}-info`}
+						/>
+					}
+				>
+					<ConfigSelect
+						testId={`panel-editor-v2-dimension-${dimension}`}
+						value={value?.[dimension] || UNSET_DIMENSION}
+						items={buildDimensionItems(valueItems, value?.[dimension], unsetLabel)}
+						onChange={(next): void => onChange({ ...value, [dimension]: next })}
+					/>
+				</ConfigField>
+			))}
+			<ConfigField
+				label={
+					<LabelWithInfo
+						label="Color by"
+						info={FIELD_INFO.colorBy}
+						testId="panel-editor-v2-dimension-colorBy-info"
+					/>
+				}
+			>
+				<ConfigMultiSelect
+					testId="panel-editor-v2-dimension-colorBy"
+					aria-label="Color by"
+					value={colorBy}
+					items={colorItems}
+					placeholder={
+						colorItems.length > 0 ? 'Every group key' : 'No group-by labels'
+					}
+					disabled={colorItems.length === 0}
+					onChange={(next): void => onChange({ ...value, colorBy: next })}
+				/>
+			</ConfigField>
+			<p className={styles.description}>
+				Each dot is one group from the query. X and Y place it, Size by scales it,
+				and Color by groups it in the legend.
+			</p>
+		</div>
+	);
+}
+
+export default DimensionsSection;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/DimensionsSection/LabelWithInfo.tsx

@@ -0,0 +1,32 @@
+import { Info } from '@signozhq/icons';
+import { TooltipSimple } from '@signozhq/ui/tooltip';
+
+import styles from './DimensionsSection.module.scss';
+
+interface LabelWithInfoProps {
+	label: string;
+	info: string;
+	testId: string;
+}
+
+function LabelWithInfo({
+	label,
+	info,
+	testId,
+}: LabelWithInfoProps): JSX.Element {
+	return (
+		<span className={styles.labelWithInfo}>
+			{label}
+			<TooltipSimple
+				title={info}
+				tooltipContentProps={{ className: styles.infoTooltip }}
+			>
+				<span className={styles.info} data-testid={testId}>
+					<Info size={12} />
+				</span>
+			</TooltipSimple>
+		</span>
+	);
+}
+
+export default LabelWithInfo;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/DimensionsSection/__tests__/DimensionsSection.test.tsx

@@ -0,0 +1,189 @@
+import { render, screen, userEvent } from 'tests/test-utils';
+
+import DimensionsSection from '../DimensionsSection';
+
+const TABLE_COLUMNS = [
+	{ key: 'A', label: 'A.Request rate', name: 'Request rate' },
+	{ key: 'B.p99(duration_nano)', label: 'B.p99 latency', name: 'p99 latency' },
+	{ key: 'C.count()', label: 'C.count()', name: 'count()' },
+];
+
+async function pick(dimension: string, label: string): Promise<void> {
+	const user = userEvent.setup();
+	const trigger = screen.getByTestId(`panel-editor-v2-dimension-${dimension}`);
+	await user.click(trigger.querySelector('.ant-select-selector') as HTMLElement);
+	await user.click(await screen.findByRole('option', { name: label }));
+}
+
+describe('DimensionsSection', () => {
+	it('names the column each unset axis falls back to', () => {
+		render(
+			<DimensionsSection
+				value={undefined}
+				onChange={jest.fn()}
+				tableColumns={TABLE_COLUMNS}
+				groupColumns={['service.name']}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-dimension-x')).toHaveTextContent(
+			'Auto (A · Request rate)',
+		);
+		expect(screen.getByTestId('panel-editor-v2-dimension-y')).toHaveTextContent(
+			'Auto (B.p99(duration_nano) · p99 latency)',
+		);
+		expect(
+			screen.getByTestId('panel-editor-v2-dimension-sizeBy'),
+		).toHaveTextContent('None');
+	});
+
+	it('falls Y back to a column other than the bound X', () => {
+		render(
+			<DimensionsSection
+				value={{ x: 'B.p99(duration_nano)' }}
+				onChange={jest.fn()}
+				tableColumns={TABLE_COLUMNS}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-dimension-y')).toHaveTextContent(
+			'Auto (A · Request rate)',
+		);
+	});
+
+	it('shows a column by its key alone when the name only repeats it', async () => {
+		const onChange = jest.fn();
+		render(
+			<DimensionsSection
+				value={undefined}
+				onChange={onChange}
+				tableColumns={TABLE_COLUMNS}
+			/>,
+		);
+
+		await pick('sizeBy', 'C.count()');
+
+		expect(onChange).toHaveBeenCalledWith({ sizeBy: 'C.count()' });
+	});
+
+	it('binds an axis to a value column by its key', async () => {
+		const onChange = jest.fn();
+		render(
+			<DimensionsSection
+				value={{ x: 'A' }}
+				onChange={onChange}
+				tableColumns={TABLE_COLUMNS}
+			/>,
+		);
+
+		await pick('y', 'B.p99(duration_nano) · p99 latency');
+
+		expect(onChange).toHaveBeenCalledWith({
+			x: 'A',
+			y: 'B.p99(duration_nano)',
+		});
+	});
+
+	it('clears the size back to none', async () => {
+		const onChange = jest.fn();
+		render(
+			<DimensionsSection
+				value={{ sizeBy: 'A' }}
+				onChange={onChange}
+				tableColumns={TABLE_COLUMNS}
+			/>,
+		);
+
+		await pick('sizeBy', 'None');
+
+		expect(onChange).toHaveBeenCalledWith({ sizeBy: '' });
+	});
+
+	it('keeps a binding the results no longer have visible', () => {
+		render(
+			<DimensionsSection
+				value={{ x: 'D' }}
+				onChange={jest.fn()}
+				tableColumns={TABLE_COLUMNS}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-dimension-x')).toHaveTextContent(
+			'D (not in results)',
+		);
+	});
+
+	it('colours by any combination of group-by keys, kept in result order', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<DimensionsSection
+				value={{ colorBy: ['service.name'] }}
+				onChange={onChange}
+				groupColumns={['k8s.namespace.name', 'service.name']}
+			/>,
+		);
+
+		const trigger = screen.getByTestId('panel-editor-v2-dimension-colorBy');
+		await user.click(
+			trigger.querySelector('.ant-select-selector') as HTMLElement,
+		);
+		await user.click(
+			await screen.findByRole('option', { name: 'k8s.namespace.name' }),
+		);
+
+		expect(onChange).toHaveBeenLastCalledWith({
+			colorBy: ['k8s.namespace.name', 'service.name'],
+		});
+	});
+
+	it('explains every field from an info icon', () => {
+		render(<DimensionsSection value={undefined} onChange={jest.fn()} />);
+
+		['x', 'y', 'sizeBy', 'colorBy'].forEach((dimension) => {
+			expect(
+				screen.getByTestId(`panel-editor-v2-dimension-${dimension}-info`),
+			).toBeInTheDocument();
+		});
+	});
+
+	it('says what an empty colour selection means', () => {
+		render(
+			<DimensionsSection
+				value={undefined}
+				onChange={jest.fn()}
+				groupColumns={['service.name']}
+			/>,
+		);
+
+		expect(screen.getByText('Every group key')).toBeInTheDocument();
+		expect(
+			screen.getByTestId('panel-editor-v2-dimension-colorBy-info'),
+		).toBeInTheDocument();
+	});
+
+	it('keeps a selected colour key the results no longer have', () => {
+		render(
+			<DimensionsSection
+				value={{ colorBy: ['host.name'] }}
+				onChange={jest.fn()}
+				groupColumns={['service.name']}
+			/>,
+		);
+
+		expect(
+			screen.getByTestId('panel-editor-v2-dimension-colorBy'),
+		).toHaveTextContent('host.name (not in results)');
+	});
+
+	it('disables colour when the query has no group by', () => {
+		render(<DimensionsSection value={undefined} onChange={jest.fn()} />);
+
+		expect(screen.getByText('No group-by labels')).toBeInTheDocument();
+		expect(
+			screen
+				.getByTestId('panel-editor-v2-dimension-colorBy')
+				.classList.contains('ant-select-disabled'),
+		).toBe(true);
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/DimensionsSection/utils.ts

@@ -0,0 +1,49 @@
+import type { ConfigMultiSelectItem } from '../../controls/ConfigMultiSelect/ConfigMultiSelect';
+import type { ConfigSelectItem } from '../../controls/ConfigSelect/ConfigSelect';
+import type { TableColumnOption } from '../../../hooks/useTableColumns';
+
+/** The select value for an unset dimension; the spec stores it as `''`. */
+export const UNSET_DIMENSION = '';
+
+/** `A · Request rate`, or the key alone when the name only repeats it (`A.count()`). */
+export function formatColumnOption({
+	key,
+	name,
+}: Pick<TableColumnOption, 'key' | 'name'>): string {
+	return key === name || key.endsWith(`.${name}`) ? key : `${key} · ${name}`;
+}
+
+export function formatAutoOption(
+	column: TableColumnOption | undefined,
+): string {
+	return column ? `Auto (${formatColumnOption(column)})` : 'Auto';
+}
+
+/**
+ * The unset option first, then the result's columns. A bound key the current
+ * result no longer has stays listed, so the select never shows a bare value.
+ */
+export function buildDimensionItems(
+	columns: ConfigSelectItem[],
+	current: string | undefined,
+	unsetLabel: string,
+): ConfigSelectItem[] {
+	const items = [{ value: UNSET_DIMENSION, label: unsetLabel }, ...columns];
+	if (current && !columns.some((column) => column.value === current)) {
+		items.push({ value: current, label: `${current} (not in results)` });
+	}
+	return items;
+}
+
+/** The result's group-by keys, then any selected key the result no longer has. */
+export function buildColorKeyItems(
+	groupColumns: string[],
+	selected: string[],
+): ConfigMultiSelectItem[] {
+	return [
+		...groupColumns.map((column) => ({ value: column, label: column })),
+		...selected
+			.filter((key) => !groupColumns.includes(key))
+			.map((key) => ({ value: key, label: `${key} (not in results)` })),
+	];
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/FormattingSection/__tests__/FormattingSection.test.tsx

@@ -152,7 +152,7 @@ describe('FormattingSection', () => {
 			<FormattingSection
 				value={{ columnUnits: { A: 'By' } }}
 				controls={{ columnUnits: true }}
-				tableColumns={[{ key: 'A', label: 'A' }]}
+				tableColumns={[{ key: 'A', label: 'A', name: 'A' }]}
 				metricUnit="s"
 				onChange={jest.fn()}
 			/>,
@@ -166,7 +166,7 @@ describe('FormattingSection', () => {
 			<FormattingSection
 				value={{ columnUnits: { A: 's' } }}
 				controls={{ columnUnits: true }}
-				tableColumns={[{ key: 'A', label: 'A' }]}
+				tableColumns={[{ key: 'A', label: 'A', name: 'A' }]}
 				metricUnit="s"
 				onChange={jest.fn()}
 			/>,

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ScatterAxesSection/ScatterAxesSection.module.scss

@@ -0,0 +1,10 @@
+.axes {
+	display: flex;
+	flex-direction: column;
+	gap: 24px;
+}
+
+.axis + .axis {
+	padding-top: 24px;
+	border-top: 1px solid var(--l1-border);
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ScatterAxesSection/ScatterAxesSection.tsx

@@ -0,0 +1,43 @@
+import type {
+	SectionEditorProps,
+	SectionKind,
+} from 'pages/DashboardPage/DashboardContainer/Panels/types/sections';
+
+import ConfigField from '../../controls/ConfigField/ConfigField';
+import type { SectionEditorContext } from '../../sectionContext';
+import { createFieldResetter } from '../../utils/changes';
+import ScatterAxisFields from './ScatterAxisFields';
+
+import styles from './ScatterAxesSection.module.scss';
+
+type ScatterAxesSectionProps = SectionEditorProps<SectionKind.ScatterAxes> &
+	Pick<SectionEditorContext, 'axisColumnNames'>;
+
+/** Edits a Scatter Plot's `axes` slice: label, soft bounds and scale, per axis. */
+function ScatterAxesSection({
+	value,
+	savedValue,
+	onChange,
+	axisColumnNames,
+}: ScatterAxesSectionProps): JSX.Element {
+	const reset = createFieldResetter(value, savedValue, onChange);
+
+	return (
+		<div className={styles.axes}>
+			{(['x', 'y'] as const).map((axis) => (
+				<div key={axis} className={styles.axis}>
+					<ConfigField label={`${axis.toUpperCase()} axis`} {...reset(axis)}>
+						<ScatterAxisFields
+							axis={axis}
+							value={value?.[axis]}
+							columnName={axisColumnNames?.[axis]}
+							onChange={(next): void => onChange({ ...value, [axis]: next })}
+						/>
+					</ConfigField>
+				</div>
+			))}
+		</div>
+	);
+}
+
+export default ScatterAxesSection;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ScatterAxesSection/ScatterAxisFields.tsx

@@ -0,0 +1,65 @@
+import { Input } from 'antd';
+import {
+	DashboardtypesAxisScaleDTO,
+	type DashboardtypesScatterPlotAxisDTO,
+} from 'api/generated/services/sigNoz.schemas';
+
+import ConfigInlineField from '../../controls/ConfigInlineField/ConfigInlineField';
+import AxisFields from '../AxesSection/AxisFields';
+import AxisRangeField from '../AxesSection/AxisRangeField';
+import AxisScaleField from '../AxesSection/AxisScaleField';
+import { LOG_RANGE_IGNORED_HELP, SCALE_HELP, SCALE_OPTIONS } from './options';
+import { hasBoundALogAxisDrops } from './utils';
+
+interface ScatterAxisFieldsProps {
+	axis: 'x' | 'y';
+	value: DashboardtypesScatterPlotAxisDTO | undefined;
+	onChange: (next: DashboardtypesScatterPlotAxisDTO) => void;
+	/** The name of the column the axis plots, shown until a label is typed. */
+	columnName?: string;
+}
+
+function ScatterAxisFields({
+	axis,
+	value,
+	onChange,
+	columnName,
+}: ScatterAxisFieldsProps): JSX.Element {
+	const scale = value?.scale ?? DashboardtypesAxisScaleDTO.auto;
+	const name = axis.toUpperCase();
+
+	return (
+		<AxisFields>
+			<ConfigInlineField label="Label">
+				<Input
+					data-testid={`panel-editor-v2-${axis}-label`}
+					aria-label={`${name}-axis label`}
+					placeholder={columnName ?? 'None'}
+					value={value?.label ?? ''}
+					onChange={(event): void =>
+						onChange({ ...value, label: event.target.value })
+					}
+				/>
+			</ConfigInlineField>
+			<AxisRangeField
+				testIdPrefix={`panel-editor-v2-${axis}`}
+				value={value}
+				onChange={(bounds): void => onChange({ ...value, ...bounds })}
+				help={
+					hasBoundALogAxisDrops(scale, value) ? LOG_RANGE_IGNORED_HELP : undefined
+				}
+				helpTestId={`panel-editor-v2-${axis}-range-help`}
+			/>
+			<AxisScaleField
+				testId={`panel-editor-v2-${axis}-scale`}
+				aria-label={`${name}-axis scale`}
+				value={scale}
+				items={SCALE_OPTIONS}
+				help={SCALE_HELP}
+				onChange={(next): void => onChange({ ...value, scale: next })}
+			/>
+		</AxisFields>
+	);
+}
+
+export default ScatterAxisFields;

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ScatterAxesSection/__tests__/ScatterAxesSection.test.tsx

@@ -0,0 +1,171 @@
+import { DashboardtypesAxisScaleDTO } from 'api/generated/services/sigNoz.schemas';
+import { render, screen, userEvent } from 'tests/test-utils';
+
+import ScatterAxesSection from '../ScatterAxesSection';
+
+describe('ScatterAxesSection', () => {
+	it('renders bounds and scale for both axes', () => {
+		render(<ScatterAxesSection value={undefined} onChange={jest.fn()} />);
+
+		['x', 'y'].forEach((axis) => {
+			expect(
+				screen.getByTestId(`panel-editor-v2-${axis}-soft-min`),
+			).toBeInTheDocument();
+			expect(
+				screen.getByTestId(`panel-editor-v2-${axis}-soft-max`),
+			).toBeInTheDocument();
+			expect(
+				screen.getByTestId(`panel-editor-v2-${axis}-scale`),
+			).toBeInTheDocument();
+		});
+	});
+
+	it('writes a soft bound to its own axis', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ScatterAxesSection
+				value={{ x: { scale: DashboardtypesAxisScaleDTO.log } }}
+				onChange={onChange}
+			/>,
+		);
+
+		await user.type(screen.getByTestId('panel-editor-v2-y-soft-max'), '5');
+
+		expect(onChange).toHaveBeenCalledWith({
+			x: { scale: DashboardtypesAxisScaleDTO.log },
+			y: { softMax: 5 },
+		});
+	});
+
+	it('shows the plotted column as each label placeholder', () => {
+		render(
+			<ScatterAxesSection
+				value={undefined}
+				onChange={jest.fn()}
+				axisColumnNames={{ x: 'Request rate', y: 'p99 latency' }}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-x-label')).toHaveAttribute(
+			'placeholder',
+			'Request rate',
+		);
+		expect(screen.getByTestId('panel-editor-v2-y-label')).toHaveAttribute(
+			'placeholder',
+			'p99 latency',
+		);
+	});
+
+	it('resets one axis without touching the other', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ScatterAxesSection
+				value={{
+					x: { scale: DashboardtypesAxisScaleDTO.log, label: 'Throughput' },
+					y: { scale: DashboardtypesAxisScaleDTO.symlog },
+				}}
+				savedValue={{}}
+				onChange={onChange}
+			/>,
+		);
+
+		const [resetX] = screen.getAllByTestId('config-field-reset');
+		await user.click(resetX);
+
+		expect(onChange).toHaveBeenCalledWith({
+			x: undefined,
+			y: { scale: DashboardtypesAxisScaleDTO.symlog },
+		});
+	});
+
+	it('says a log axis ignores a bound at or below zero', () => {
+		render(
+			<ScatterAxesSection
+				value={{
+					x: { scale: DashboardtypesAxisScaleDTO.log, softMin: -10 },
+					y: { scale: DashboardtypesAxisScaleDTO.symlog, softMin: -10 },
+				}}
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-x-range-help')).toHaveTextContent(
+			"A log axis can't reach 0 or below",
+		);
+		expect(screen.getByTestId('panel-editor-v2-y-range-help')).toHaveTextContent(
+			'The axis always shows at least this range.',
+		);
+	});
+
+	it('flags a soft min above the soft max on that axis only', () => {
+		render(
+			<ScatterAxesSection
+				value={{ x: { softMin: 23, softMax: 12 }, y: { softMin: 1, softMax: 2 } }}
+				onChange={jest.fn()}
+			/>,
+		);
+
+		expect(screen.getByTestId('panel-editor-v2-x-range-help')).toHaveTextContent(
+			"Min can't be greater than Max.",
+		);
+		expect(screen.getByTestId('panel-editor-v2-y-range-help')).toHaveTextContent(
+			'The axis always shows at least this range.',
+		);
+	});
+
+	it('writes an axis label', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(<ScatterAxesSection value={undefined} onChange={onChange} />);
+
+		await user.type(screen.getByTestId('panel-editor-v2-y-label'), 'p');
+
+		expect(onChange).toHaveBeenCalledWith({ y: { label: 'p' } });
+	});
+
+	it('clears a soft bound to null when the field is emptied', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ScatterAxesSection value={{ x: { softMin: 10 } }} onChange={onChange} />,
+		);
+
+		await user.clear(screen.getByTestId('panel-editor-v2-x-soft-min'));
+
+		expect(onChange).toHaveBeenCalledWith({ x: { softMin: null } });
+	});
+
+	it.each([
+		DashboardtypesAxisScaleDTO.linear,
+		DashboardtypesAxisScaleDTO.log,
+		DashboardtypesAxisScaleDTO.symlog,
+	])('sets the x scale to %s', async (scale) => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(<ScatterAxesSection value={undefined} onChange={onChange} />);
+
+		await user.click(screen.getByTestId(`panel-editor-v2-x-scale-${scale}`));
+
+		expect(onChange).toHaveBeenCalledWith({ x: { scale } });
+	});
+
+	it('marks a changed scale against the saved value and resets it', async () => {
+		const user = userEvent.setup();
+		const onChange = jest.fn();
+		render(
+			<ScatterAxesSection
+				value={{ y: { scale: DashboardtypesAxisScaleDTO.log } }}
+				savedValue={{ y: { scale: DashboardtypesAxisScaleDTO.auto } }}
+				onChange={onChange}
+			/>,
+		);
+
+		await user.click(screen.getByRole('button', { name: /reset/i }));
+
+		expect(onChange).toHaveBeenCalledWith({
+			y: { scale: DashboardtypesAxisScaleDTO.auto },
+		});
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ScatterAxesSection/options.ts

@@ -0,0 +1,23 @@
+import { DashboardtypesAxisScaleDTO } from 'api/generated/services/sigNoz.schemas';
+
+import {
+	pickScaleOptions,
+	SCALE_HELP as AXIS_SCALE_HELP,
+} from '../AxesSection/options';
+
+export const SCALE_OPTIONS = pickScaleOptions([
+	DashboardtypesAxisScaleDTO.auto,
+	DashboardtypesAxisScaleDTO.linear,
+	DashboardtypesAxisScaleDTO.log,
+	DashboardtypesAxisScaleDTO.symlog,
+]);
+
+export const LOG_RANGE_IGNORED_HELP =
+	"A log axis can't reach 0 or below, so that bound is ignored. Use Symlog to include it.";
+
+/** A log axis leaves out groups it can't place, rather than drawing them elsewhere. */
+export const SCALE_HELP: Record<DashboardtypesAxisScaleDTO, string> = {
+	...AXIS_SCALE_HELP,
+	[DashboardtypesAxisScaleDTO.log]:
+		"Spreads out values that span orders of magnitude. Groups with a value of 0 or less can't be placed and are left out.",
+};

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/sections/ScatterAxesSection/utils.ts

@@ -0,0 +1,17 @@
+import {
+	DashboardtypesAxisScaleDTO,
+	type DashboardtypesScatterPlotAxisDTO,
+} from 'api/generated/services/sigNoz.schemas';
+
+/** A log axis cannot place a soft bound at or below zero, so it drops it. */
+export function hasBoundALogAxisDrops(
+	scale: DashboardtypesAxisScaleDTO,
+	axis: DashboardtypesScatterPlotAxisDTO | undefined,
+): boolean {
+	return (
+		scale === DashboardtypesAxisScaleDTO.log &&
+		[axis?.softMin, axis?.softMax].some(
+			(bound) => typeof bound === 'number' && bound <= 0,
+		)
+	);
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/utils/__tests__/scatterAxisColumns.test.ts

@@ -0,0 +1,52 @@
+import type { DashboardtypesPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
+
+import { getScatterAxisColumnNames } from '../scatterAxisColumns';
+
+const COLUMNS = [
+	{ key: 'A', label: 'A.Request rate', name: 'Request rate' },
+	{ key: 'B', label: 'B.p99 latency', name: 'p99 latency' },
+	{ key: 'C', label: 'C.Errors', name: 'Errors' },
+];
+
+const scatterSpec = (dimensions: {
+	x?: string;
+	y?: string;
+}): DashboardtypesPanelSpecDTO =>
+	({
+		plugin: { kind: 'signoz/ScatterPlotPanel', spec: { dimensions } },
+		queries: [],
+	}) as unknown as DashboardtypesPanelSpecDTO;
+
+describe('getScatterAxisColumnNames', () => {
+	it('names the first two value columns when nothing is bound', () => {
+		expect(getScatterAxisColumnNames(scatterSpec({}), COLUMNS)).toStrictEqual({
+			x: 'Request rate',
+			y: 'p99 latency',
+		});
+	});
+
+	it('follows the bound columns, with Y avoiding the column X took', () => {
+		expect(
+			getScatterAxisColumnNames(scatterSpec({ x: 'A', y: 'C' }), COLUMNS),
+		).toStrictEqual({ x: 'Request rate', y: 'Errors' });
+		expect(
+			getScatterAxisColumnNames(scatterSpec({ x: 'B' }), COLUMNS),
+		).toStrictEqual({ x: 'p99 latency', y: 'Request rate' });
+	});
+
+	it('is empty before results load and for other kinds', () => {
+		expect(getScatterAxisColumnNames(scatterSpec({}), [])).toStrictEqual({
+			x: undefined,
+			y: undefined,
+		});
+		expect(
+			getScatterAxisColumnNames(
+				{
+					plugin: { kind: 'signoz/TablePanel', spec: {} },
+					queries: [],
+				} as unknown as DashboardtypesPanelSpecDTO,
+				COLUMNS,
+			),
+		).toStrictEqual({});
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/utils/__tests__/sizeColumnLabel.test.ts

@@ -0,0 +1,41 @@
+import type { DashboardtypesPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
+
+import { getSizeColumnLabel } from '../sizeColumnLabel';
+
+const scatterSpec = (size?: string): DashboardtypesPanelSpecDTO =>
+	({
+		plugin: {
+			kind: 'signoz/ScatterPlotPanel',
+			spec: { dimensions: { sizeBy: size } },
+		},
+		queries: [],
+	}) as unknown as DashboardtypesPanelSpecDTO;
+
+const COLUMNS = [{ key: 'B', label: 'B.count()', name: 'count()' }];
+
+describe('getSizeColumnLabel', () => {
+	it('names the bound column by its label', () => {
+		expect(getSizeColumnLabel(scatterSpec('B'), COLUMNS)).toBe('B.count()');
+	});
+
+	it('is unset when nothing is bound', () => {
+		expect(getSizeColumnLabel(scatterSpec(''), COLUMNS)).toBeUndefined();
+		expect(getSizeColumnLabel(scatterSpec(), COLUMNS)).toBeUndefined();
+	});
+
+	it('is unset for a bound key the loaded result no longer has, as the chart draws it', () => {
+		expect(getSizeColumnLabel(scatterSpec('C'), COLUMNS)).toBeUndefined();
+	});
+
+	it('falls back to the key before the result loads', () => {
+		expect(getSizeColumnLabel(scatterSpec('B'), [])).toBe('B');
+	});
+
+	it('is unset for other kinds', () => {
+		const spec = {
+			plugin: { kind: 'signoz/TablePanel', spec: {} },
+			queries: [],
+		} as unknown as DashboardtypesPanelSpecDTO;
+		expect(getSizeColumnLabel(spec, COLUMNS)).toBeUndefined();
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/utils/scatterAxisColumns.ts

@@ -0,0 +1,33 @@
+import type { DashboardtypesPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
+
+import type { TableColumnOption } from '../../hooks/useTableColumns';
+
+/**
+ * The columns a Scatter Plot's axes plot, as the renderer picks them: a bound
+ * key, else X takes the first value column and Y the first one X did not take.
+ */
+export function resolveAutoAxes(
+	columns: TableColumnOption[],
+	bound: { x?: string; y?: string },
+): { x?: TableColumnOption; y?: TableColumnOption } {
+	const x = columns.find((column) => column.key === bound.x) ?? columns[0];
+	const y =
+		columns.find((column) => column.key === bound.y) ??
+		columns.find((column) => column !== x);
+	return { x, y };
+}
+
+/** The name of the column each axis plots; unset for other kinds or before results load. */
+export function getScatterAxisColumnNames(
+	spec: DashboardtypesPanelSpecDTO,
+	tableColumns: TableColumnOption[] = [],
+): { x?: string; y?: string } {
+	if (spec.plugin.kind !== 'signoz/ScatterPlotPanel') {
+		return {};
+	}
+	const { x, y } = resolveAutoAxes(tableColumns, {
+		x: spec.plugin.spec.dimensions?.x,
+		y: spec.plugin.spec.dimensions?.y,
+	});
+	return { x: x?.name, y: y?.name };
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/ConfigPane/utils/sizeColumnLabel.ts

@@ -0,0 +1,24 @@
+import type { DashboardtypesPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
+
+import type { TableColumnOption } from '../../hooks/useTableColumns';
+
+/**
+ * What the dots are sized by, mirroring the renderer: a bound key the loaded
+ * result no longer has sizes nothing. Before the result loads the key stands in.
+ */
+export function getSizeColumnLabel(
+	spec: DashboardtypesPanelSpecDTO,
+	tableColumns: TableColumnOption[] = [],
+): string | undefined {
+	if (spec.plugin.kind !== 'signoz/ScatterPlotPanel') {
+		return undefined;
+	}
+	const key = spec.plugin.spec.dimensions?.sizeBy;
+	if (!key) {
+		return undefined;
+	}
+	if (tableColumns.length === 0) {
+		return key;
+	}
+	return tableColumns.find((column) => column.key === key)?.label;
+}

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

@@ -24,6 +24,7 @@ import type { RenderableQueryPanelDefinition } from '../../Panels/types/panelDef
 import { toPanelType } from '../../Panels/types/panelKind';
 
 import styles from './PanelEditorQueryBuilder.module.scss';
+import { useSyncQueryBuilderFields } from './useSyncQueryBuilderFields';
 
 interface PanelEditorQueryBuilderProps {
 	/** The edited kind's definition — drives supported query types, the signals the
@@ -62,6 +63,7 @@ function PanelEditorQueryBuilder({
 	const isRawQuery = isRawRequest(panelDefinition.queryCapabilities);
 	const { currentQuery, redirectWithQueryBuilderData } = useQueryBuilder();
 	const isDarkMode = useIsDarkMode();
+	useSyncQueryBuilderFields(panelDefinition.syncedQueryBuilderFields);
 
 	const handleQueryCategoryChange = useCallback(
 		(queryType: string): void => {

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

@@ -14,6 +14,9 @@ jest.mock('hooks/queryBuilder/useQueryBuilder', () => ({
 	useQueryBuilder: jest.fn(),
 }));
 jest.mock('hooks/useDarkMode', () => ({ useIsDarkMode: (): boolean => false }));
+jest.mock('../useSyncQueryBuilderFields', () => ({
+	useSyncQueryBuilderFields: jest.fn(),
+}));
 jest.mock('components/QueryBuilderV2/QueryBuilderV2', () => ({
 	QueryBuilderV2: (props: unknown): null => {
 		mockQueryBuilderV2(props);

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PanelEditorQueryBuilder/__tests__/syncQueryBuilderFields.test.ts

@@ -0,0 +1,112 @@
+import { QueryBuilderField } from 'components/QueryBuilderV2/queryBuilderFields.types';
+import type { BaseAutocompleteData } from 'types/api/queryBuilder/queryAutocompleteResponse';
+import type { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
+
+import type { SyncedQueryBuilderField } from '../../../Panels/types/panelCapabilities';
+import {
+	snapshotQueries,
+	syncQueryBuilderFields,
+} from '../syncQueryBuilderFields';
+
+const key = (name: string): BaseAutocompleteData =>
+	({ key: name }) as BaseAutocompleteData;
+
+function query(
+	queryName: string,
+	{
+		groupBy = [],
+		limit = null,
+		dataSource = 'traces',
+	}: { groupBy?: string[]; limit?: number | null; dataSource?: string } = {},
+): IBuilderQuery {
+	return {
+		queryName,
+		groupBy: groupBy.map(key),
+		limit,
+		dataSource,
+	} as IBuilderQuery;
+}
+
+const GROUP_BY: SyncedQueryBuilderField[] = [QueryBuilderField.GroupBy];
+
+describe('syncQueryBuilderFields', () => {
+	it('copies an edited field to the other queries', () => {
+		const previous = snapshotQueries([query('A'), query('B')]);
+
+		expect(
+			syncQueryBuilderFields(
+				[query('A', { groupBy: ['service.name'] }), query('B')],
+				previous,
+				GROUP_BY,
+			),
+		).toStrictEqual([
+			{ index: 1, query: query('B', { groupBy: ['service.name'] }) },
+		]);
+	});
+
+	it('gives a new query the existing values', () => {
+		const previous = snapshotQueries([query('A', { groupBy: ['service.name'] })]);
+
+		expect(
+			syncQueryBuilderFields(
+				[query('A', { groupBy: ['service.name'] }), query('B')],
+				previous,
+				GROUP_BY,
+			),
+		).toStrictEqual([
+			{ index: 1, query: query('B', { groupBy: ['service.name'] }) },
+		]);
+	});
+
+	it("gives a query switched to another signal the others' values, not its reset ones", () => {
+		const previous = snapshotQueries([
+			query('A', { groupBy: ['service.name'] }),
+			query('B', { groupBy: ['service.name'], dataSource: 'metrics' }),
+		]);
+
+		expect(
+			syncQueryBuilderFields(
+				[query('A', { groupBy: ['service.name'] }), query('B')],
+				previous,
+				GROUP_BY,
+			),
+		).toStrictEqual([
+			{ index: 1, query: query('B', { groupBy: ['service.name'] }) },
+		]);
+	});
+
+	it('leaves values that already differ until one is edited', () => {
+		const queries = [query('A', { groupBy: ['host.name'] }), query('B')];
+
+		expect(
+			syncQueryBuilderFields(queries, snapshotQueries(queries), GROUP_BY),
+		).toStrictEqual([]);
+	});
+
+	it('syncs each field from its own source', () => {
+		const previous = snapshotQueries([query('A'), query('B')]);
+
+		expect(
+			syncQueryBuilderFields(
+				[query('A', { groupBy: ['service.name'] }), query('B', { limit: 50 })],
+				previous,
+				[QueryBuilderField.GroupBy, QueryBuilderField.Limit],
+			),
+		).toStrictEqual([
+			{ index: 0, query: query('A', { groupBy: ['service.name'], limit: 50 }) },
+			{ index: 1, query: query('B', { groupBy: ['service.name'], limit: 50 }) },
+		]);
+	});
+
+	it('leaves fields it is not asked to sync', () => {
+		const previous = snapshotQueries([query('A'), query('B')]);
+
+		expect(
+			syncQueryBuilderFields(
+				[query('A', { limit: 50 }), query('B')],
+				previous,
+				GROUP_BY,
+			),
+		).toStrictEqual([]);
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PanelEditorQueryBuilder/__tests__/useSyncQueryBuilderFields.test.ts

@@ -0,0 +1,62 @@
+import { renderHook } from '@testing-library/react';
+import { QueryBuilderField } from 'components/QueryBuilderV2/queryBuilderFields.types';
+import type { BaseAutocompleteData } from 'types/api/queryBuilder/queryAutocompleteResponse';
+import type { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
+
+import type { SyncedQueryBuilderField } from '../../../Panels/types/panelCapabilities';
+import { useSyncQueryBuilderFields } from '../useSyncQueryBuilderFields';
+
+const mockHandleSetQueryData = jest.fn();
+let mockQueries: IBuilderQuery[] = [];
+
+jest.mock('hooks/queryBuilder/useQueryBuilder', () => ({
+	useQueryBuilder: (): unknown => ({
+		currentQuery: { builder: { queryData: mockQueries } },
+		handleSetQueryData: mockHandleSetQueryData,
+	}),
+}));
+
+const query = (queryName: string, groupBy: string[]): IBuilderQuery =>
+	({
+		queryName,
+		groupBy: groupBy.map((name) => ({ key: name }) as BaseAutocompleteData),
+		dataSource: 'traces',
+	}) as IBuilderQuery;
+
+const GROUP_BY: SyncedQueryBuilderField[] = [QueryBuilderField.GroupBy];
+
+function setup(
+	fields: SyncedQueryBuilderField[] | undefined,
+	initial: IBuilderQuery[],
+): (next: IBuilderQuery[]) => void {
+	mockQueries = initial;
+	const { rerender } = renderHook(() => useSyncQueryBuilderFields(fields));
+	return (next): void => {
+		mockQueries = next;
+		rerender();
+	};
+}
+
+describe('useSyncQueryBuilderFields', () => {
+	beforeEach(() => mockHandleSetQueryData.mockClear());
+
+	it('writes the synced value into the other queries', () => {
+		const update = setup(GROUP_BY, [query('A', []), query('B', [])]);
+
+		update([query('A', ['service.name']), query('B', [])]);
+
+		expect(mockHandleSetQueryData).toHaveBeenCalledTimes(1);
+		expect(mockHandleSetQueryData).toHaveBeenCalledWith(
+			1,
+			query('B', ['service.name']),
+		);
+	});
+
+	it('does nothing when the kind syncs no fields', () => {
+		const update = setup(undefined, [query('A', []), query('B', [])]);
+
+		update([query('A', ['service.name']), query('B', [])]);
+
+		expect(mockHandleSetQueryData).not.toHaveBeenCalled();
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PanelEditorQueryBuilder/syncQueryBuilderFields.ts

@@ -0,0 +1,72 @@
+import { QueryBuilderField } from 'components/QueryBuilderV2/queryBuilderFields.types';
+import { isEqual } from 'lodash-es';
+import type { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
+
+import type { SyncedQueryBuilderField } from '../../Panels/types/panelCapabilities';
+
+const QUERY_PROPERTY = {
+	[QueryBuilderField.GroupBy]: 'groupBy',
+	[QueryBuilderField.OrderBy]: 'orderBy',
+	[QueryBuilderField.Having]: 'having',
+	[QueryBuilderField.Limit]: 'limit',
+	[QueryBuilderField.StepInterval]: 'stepInterval',
+	[QueryBuilderField.ReduceTo]: 'reduceTo',
+} as const satisfies Record<SyncedQueryBuilderField, keyof IBuilderQuery>;
+
+export function snapshotQueries(
+	queries: IBuilderQuery[],
+): Map<string, IBuilderQuery> {
+	return new Map(queries.map((query) => [query.queryName, query]));
+}
+
+/**
+ * The query each field should be copied from: the one whose value just
+ * changed, or any settled query when one was added or switched signal. A
+ * signal switch reloads that query's own state, so it is never the source.
+ */
+function findSource(
+	property: keyof IBuilderQuery,
+	settled: IBuilderQuery[],
+	hasNewcomer: boolean,
+	previous: Map<string, IBuilderQuery>,
+): IBuilderQuery | undefined {
+	const changed = settled.find(
+		(query) =>
+			!isEqual(previous.get(query.queryName)?.[property], query[property]),
+	);
+	return changed ?? (hasNewcomer ? settled[0] : undefined);
+}
+
+/** The queries that need rewriting so every synced field matches its source. */
+export function syncQueryBuilderFields(
+	queries: IBuilderQuery[],
+	previous: Map<string, IBuilderQuery>,
+	fields: SyncedQueryBuilderField[],
+): { index: number; query: IBuilderQuery }[] {
+	const settled = queries.filter((query) => {
+		const before = previous.get(query.queryName);
+		return (
+			before?.dataSource === query.dataSource && before.source === query.source
+		);
+	});
+	const hasNewcomer = settled.length < queries.length;
+	const sources = fields
+		.map((field) => QUERY_PROPERTY[field])
+		.map((property) => ({
+			property,
+			source: findSource(property, settled, hasNewcomer, previous),
+		}));
+
+	return queries.flatMap((query, index) => {
+		const patch = sources.reduce<Partial<IBuilderQuery>>(
+			(acc, { property, source }) =>
+				source && !isEqual(query[property], source[property])
+					? { ...acc, [property]: source[property] }
+					: acc,
+			{},
+		);
+		return Object.keys(patch).length > 0
+			? [{ index, query: { ...query, ...patch } }]
+			: [];
+	});
+}

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/PanelEditorQueryBuilder/useSyncQueryBuilderFields.ts

@@ -0,0 +1,37 @@
+import { useEffect, useRef } from 'react';
+import { useQueryBuilder } from 'hooks/queryBuilder/useQueryBuilder';
+import type { IBuilderQuery } from 'types/api/queryBuilder/queryBuilderData';
+
+import type { SyncedQueryBuilderField } from '../../Panels/types/panelCapabilities';
+import {
+	snapshotQueries,
+	syncQueryBuilderFields,
+} from './syncQueryBuilderFields';
+
+const NO_FIELDS: SyncedQueryBuilderField[] = [];
+
+/**
+ * Keeps `fields` equal across builder queries: an edit to one query copies to
+ * the rest, and a query added or switched to another signal takes the others'
+ * values. Values that already differ when this starts are left alone until one
+ * of them is edited.
+ */
+export function useSyncQueryBuilderFields(
+	fields: SyncedQueryBuilderField[] = NO_FIELDS,
+): void {
+	const { currentQuery, handleSetQueryData } = useQueryBuilder();
+	const queries = currentQuery.builder.queryData;
+	const previousRef = useRef<Map<string, IBuilderQuery>>();
+	const enabled = fields.length > 0;
+
+	useEffect(() => {
+		const previous = previousRef.current;
+		previousRef.current = enabled ? snapshotQueries(queries) : undefined;
+		if (!enabled || !previous || queries.length < 2) {
+			return;
+		}
+		syncQueryBuilderFields(queries, previous, fields).forEach(
+			({ index, query }) => handleSetQueryData(index, query),
+		);
+	}, [enabled, fields, queries, handleSetQueryData]);
+}

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

@@ -35,6 +35,7 @@ import { useSeedMetricUnit } from './hooks/useSeedMetricUnit';
 import { useSeedNewListColumns } from './hooks/useSeedNewListColumns';
 import { useSwitchColumnsOnSignalChange } from './hooks/useSwitchColumnsOnSignalChange';
 import { useSwitchToViewMode } from './hooks/useSwitchToViewMode';
+import { useGroupColumns } from './hooks/useGroupColumns';
 import { useTableColumns } from './hooks/useTableColumns';
 
 import logEvent from '@/api/common/logEvent';
@@ -196,6 +197,7 @@ function QueryEditorBody({
 	const { onDragSelect } = usePanelInteractions();
 	const legendSeries = useLegendSeries(draft, data);
 	const tableColumns = useTableColumns(draft, data);
+	const groupColumns = useGroupColumns(draft, data);
 
 	// Resolves the selected metric's unit and, on a new panel, seeds it into the right
 	// formatting field for the kind (panel-wide `unit`, or per-column `columnUnits` for
@@ -326,6 +328,7 @@ function QueryEditorBody({
 					queryType={currentQuery.queryType}
 					legendSeries={legendSeries}
 					tableColumns={tableColumns}
+					groupColumns={groupColumns}
 					stepInterval={stepInterval}
 					metricUnit={metricUnit}
 				/>

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/hooks/__tests__/useGroupColumns.test.ts

@@ -0,0 +1,69 @@
+import { renderHook } from '@testing-library/react';
+import type { DashboardtypesPanelDTO } from 'api/generated/services/sigNoz.schemas';
+import { prepareScalarTables } from 'pages/DashboardPage/DashboardContainer/queryV5/prepareScalarTables';
+import type { PanelQueryData } from 'pages/DashboardPage/DashboardContainer/queryV5/types';
+
+import { useGroupColumns } from '../useGroupColumns';
+
+jest.mock(
+	'pages/DashboardPage/DashboardContainer/queryV5/prepareScalarTables',
+	() => ({ prepareScalarTables: jest.fn() }),
+);
+jest.mock(
+	'pages/DashboardPage/DashboardContainer/queryV5/v5ResponseData',
+	() => ({ getScalarResults: jest.fn(() => []) }),
+);
+
+const mockPrepareScalarTables = prepareScalarTables as unknown as jest.Mock;
+
+const DATA = {
+	response: undefined,
+	legendMap: {},
+	requestPayload: undefined,
+} as unknown as PanelQueryData;
+
+function panelOfKind(kind: string): DashboardtypesPanelDTO {
+	return {
+		kind: 'Panel',
+		spec: { plugin: { kind, spec: {} }, queries: [] },
+	} as unknown as DashboardtypesPanelDTO;
+}
+
+describe('useGroupColumns', () => {
+	beforeEach(() => {
+		jest.clearAllMocks();
+	});
+
+	it('returns [] for a kind that does not join its scalar rows', () => {
+		const { result } = renderHook(() =>
+			useGroupColumns(panelOfKind('signoz/PieChartPanel'), DATA),
+		);
+
+		expect(result.current).toStrictEqual([]);
+		expect(mockPrepareScalarTables).not.toHaveBeenCalled();
+	});
+
+	it('keeps only the group-by columns, by key', () => {
+		mockPrepareScalarTables.mockReturnValue([
+			{ columns: [], rows: [] },
+			{
+				columns: [
+					{
+						id: 'k8s.namespace.name',
+						name: 'k8s.namespace.name',
+						isValueColumn: false,
+					},
+					{ id: 'A', name: 'cpu', isValueColumn: true },
+					{ id: 'k8s.pod.name', name: 'k8s.pod.name', isValueColumn: false },
+				],
+				rows: [],
+			},
+		]);
+
+		const { result } = renderHook(() =>
+			useGroupColumns(panelOfKind('signoz/ScatterPlotPanel'), DATA),
+		);
+
+		expect(result.current).toStrictEqual(['k8s.namespace.name', 'k8s.pod.name']);
+	});
+});

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/hooks/__tests__/useLegendSeries.test.ts

@@ -3,6 +3,7 @@ import type { DashboardtypesPanelDTO } from 'api/generated/services/sigNoz.schem
 import { useIsDarkMode } from 'hooks/useDarkMode';
 import { generateColor } from 'lib/uPlotLib/utils/generateColor';
 import { preparePieData } from 'pages/DashboardPage/DashboardContainer/Panels/kinds/PieChartPanel/prepareData';
+import { prepareScalarTables } from 'pages/DashboardPage/DashboardContainer/queryV5/prepareScalarTables';
 import { resolveSeriesLabelV5 } from 'pages/DashboardPage/DashboardContainer/Panels/utils/resolveSeriesLabel';
 import type { PanelQueryData } from 'pages/DashboardPage/DashboardContainer/queryV5/types';
 import { flattenTimeSeries } from 'pages/DashboardPage/DashboardContainer/queryV5/v5ResponseData';
@@ -47,6 +48,7 @@ const mockFlatten = flattenTimeSeries as unknown as jest.Mock;
 const mockResolveLabel = resolveSeriesLabelV5 as unknown as jest.Mock;
 const mockGenerateColor = generateColor as unknown as jest.Mock;
 const mockPreparePie = preparePieData as unknown as jest.Mock;
+const mockPrepareScalarTables = prepareScalarTables as unknown as jest.Mock;
 
 const PANEL = {
 	kind: 'Panel',
@@ -60,6 +62,17 @@ const HISTOGRAM_PANEL = {
 	kind: 'Panel',
 	spec: { plugin: { kind: 'signoz/HistogramPanel', spec: {} }, queries: [] },
 } as unknown as DashboardtypesPanelDTO;
+const scatterPanel = (colorBy?: string[]): DashboardtypesPanelDTO =>
+	({
+		kind: 'Panel',
+		spec: {
+			plugin: {
+				kind: 'signoz/ScatterPlotPanel',
+				spec: { dimensions: { colorBy } },
+			},
+			queries: [],
+		},
+	}) as unknown as DashboardtypesPanelDTO;
 const DATA = { response: {}, legendMap: {} } as unknown as PanelQueryData;
 
 // Each flattened series carries the label resolveSeriesLabelV5 should report.
@@ -133,6 +146,36 @@ describe('useLegendSeries', () => {
 		expect(mockFlatten).not.toHaveBeenCalled();
 	});
 
+	it('resolves scatter plot panels by the colour-by label', () => {
+		mockPrepareScalarTables.mockReturnValue([
+			{
+				queryName: 'A',
+				legend: '',
+				columns: [
+					{ id: 'ns', name: 'ns', queryName: '', isValueColumn: false },
+					{ id: 'pod', name: 'pod', queryName: '', isValueColumn: false },
+					{ id: 'A', name: 'A', queryName: 'A', isValueColumn: true },
+					{ id: 'B', name: 'B', queryName: 'B', isValueColumn: true },
+				],
+				rows: [
+					{ data: { ns: 'prod', pod: 'p1', A: 1, B: 2 } },
+					{ data: { ns: 'dev', pod: 'p2', A: 3, B: 4 } },
+					{ data: { ns: 'prod', pod: 'p3', A: 5, B: 6 } },
+				],
+			},
+		]);
+
+		const { result } = renderHook(() =>
+			useLegendSeries(scatterPanel(['ns']), DATA),
+		);
+
+		expect(result.current).toStrictEqual([
+			{ label: 'prod', defaultColor: 'color:prod' },
+			{ label: 'dev', defaultColor: 'color:dev' },
+		]);
+		expect(mockFlatten).not.toHaveBeenCalled();
+	});
+
 	it('uses the dark palette in dark mode and the light palette otherwise', () => {
 		mockFlatten.mockReturnValue(seriesWithLabels(['a']));
 

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/hooks/__tests__/useSeedMetricUnit.test.ts

@@ -39,8 +39,8 @@ function columnUnits(spec: DashboardtypesPanelSpecDTO): unknown {
 }
 
 const COLUMNS: TableColumnOption[] = [
-	{ key: 'A', label: 'A' },
-	{ key: 'B', label: 'B' },
+	{ key: 'A', label: 'A', name: 'A' },
+	{ key: 'B', label: 'B', name: 'B' },
 ];
 
 const NO_COLUMNS: TableColumnOption[] = [];

frontend/src/pages/DashboardPage/DashboardContainer/PanelEditor/hooks/__tests__/useTableColumns.test.ts

@@ -56,6 +56,23 @@ describe('useTableColumns', () => {
 		expect(mockPrepareScalarTables).not.toHaveBeenCalled();
 	});
 
+	it('resolves columns for a scatter plot, which joins its rows like a table', () => {
+		tableWith([{ id: 'A', name: 'p99', isValueColumn: true }]);
+		const panel = {
+			kind: 'Panel',
+			spec: {
+				plugin: { kind: 'signoz/ScatterPlotPanel', spec: {} },
+				queries: [],
+			},
+		} as unknown as DashboardtypesPanelDTO;
+
+		const { result } = renderHook(() => useTableColumns(panel, DATA));
+
+		expect(result.current).toStrictEqual([
+			{ key: 'A', label: 'p99', name: 'p99', unit: undefined },
+		]);
+	});
+
 	it('returns [] when there is no scalar table with columns', () => {
 		mockPrepareScalarTables.mockReturnValue([{ columns: [], rows: [] }]);
 
@@ -73,7 +90,7 @@ describe('useTableColumns', () => {
 		const { result } = renderHook(() => useTableColumns(tablePanel(), DATA));
 
 		expect(result.current).toStrictEqual([
-			{ key: 'A', label: 'p99', unit: undefined },
+			{ key: 'A', label: 'p99', name: 'p99', unit: undefined },
 		]);
 	});
 

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

@@ -0,0 +1,37 @@
+import { useMemo } from 'react';
+import type { DashboardtypesPanelDTO } from 'api/generated/services/sigNoz.schemas';
+import { getQueryPanelDefinition } from 'pages/DashboardPage/DashboardContainer/Panels/capabilities';
+import { prepareScalarTables } from 'pages/DashboardPage/DashboardContainer/queryV5/prepareScalarTables';
+import type { PanelQueryData } from 'pages/DashboardPage/DashboardContainer/queryV5/types';
+import { getScalarResults } from 'pages/DashboardPage/DashboardContainer/queryV5/v5ResponseData';
+
+/**
+ * Group-by labels of a joined scalar result, the keys a group column is stored
+ * under. Empty for kinds that don't join their scalar rows or before data arrives.
+ */
+export function useGroupColumns(
+	panel: DashboardtypesPanelDTO,
+	data: PanelQueryData,
+): string[] {
+	return useMemo(() => {
+		if (
+			!getQueryPanelDefinition(panel.spec.plugin.kind)?.queryCapabilities
+				.formatTableResultForUI
+		) {
+			return [];
+		}
+		const table = prepareScalarTables({
+			results: getScalarResults(data.response),
+			legendMap: data.legendMap,
+			requestPayload: data.requestPayload,
+		}).find((candidate) => candidate.columns.length > 0);
+		return (table?.columns ?? [])
+			.filter((column) => !column.isValueColumn)
+			.map((column) => column.id);
+	}, [
+		panel.spec.plugin.kind,
+		data.response,
+		data.legendMap,
+		data.requestPayload,
+	]);
+}

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

@@ -21,7 +21,12 @@ export function useLegendSeries(
 	return useMemo(() => {
 		const resolve = getSectionControls(kind, SectionKind.Legend)?.colors;
 		return resolve
-			? resolve({ queries: panel.spec.queries, data, isDarkMode })
+			? resolve({
+					spec: panel.spec,
+					queries: panel.spec.queries,
+					data,
+					isDarkMode,
+				})
 			: [];
-	}, [kind, panel.spec.queries, data, isDarkMode]);
+	}, [kind, panel.spec, data, isDarkMode]);
 }

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

@@ -1,7 +1,9 @@
 import { useMemo } from 'react';
 import type { DashboardtypesPanelDTO } from 'api/generated/services/sigNoz.schemas';
+import { getQueryPanelDefinition } from 'pages/DashboardPage/DashboardContainer/Panels/capabilities';
 import type { PanelFormattingSlice } from 'pages/DashboardPage/DashboardContainer/Panels/types/sections';
 import { getColumnUnit } from 'pages/DashboardPage/DashboardContainer/Panels/utils/getColumnUnit';
+import { getValueColumnLabels } from 'pages/DashboardPage/DashboardContainer/Panels/utils/getValueColumnLabels';
 import { prepareScalarTables } from 'pages/DashboardPage/DashboardContainer/queryV5/prepareScalarTables';
 import type { PanelQueryData } from 'pages/DashboardPage/DashboardContainer/queryV5/types';
 import { getScalarResults } from 'pages/DashboardPage/DashboardContainer/queryV5/v5ResponseData';
@@ -16,6 +18,8 @@ export interface TableColumnOption {
 	key: string;
 	/** Display label shown in the editor — the resolved column name. */
 	label: string;
+	/** The column's own name (alias/legend/expression), without the query prefix. */
+	name: string;
 	/**
 	 * The column's configured unit (`formatting.columnUnits[key]`), if any. The
 	 * per-column threshold editor scopes its unit picker to this unit's category
@@ -28,14 +32,18 @@ export interface TableColumnOption {
  * Resolves a Table panel's value (aggregation) columns into `{ key, label }`
  * options, so the table-only config editors (column units, per-column thresholds)
  * store the query-keyed value the renderer looks up by while showing the readable
- * column name. Empty for non-table kinds or before data arrives.
+ * column name. Empty for kinds that don't join their scalar rows (Table and
+ * Scatter Plot do) or before data arrives.
  */
 export function useTableColumns(
 	panel: DashboardtypesPanelDTO,
 	data: PanelQueryData,
 ): TableColumnOption[] {
 	return useMemo(() => {
-		if (panel.spec.plugin.kind !== 'signoz/TablePanel') {
+		if (
+			!getQueryPanelDefinition(panel.spec.plugin.kind)?.queryCapabilities
+				.formatTableResultForUI
+		) {
 			return [];
 		}
 		const table = prepareScalarTables({
@@ -49,13 +57,15 @@ export function useTableColumns(
 		const columnUnits =
 			(panel.spec.plugin.spec as { formatting?: PanelFormattingSlice }).formatting
 				?.columnUnits ?? {};
+		const labels = getValueColumnLabels(table.columns);
 		return table.columns
 			.filter((column) => column.isValueColumn)
 			.map((column) => {
 				const key = column.id || column.name;
 				return {
 					key,
-					label: column.name,
+					label: labels[key] ?? column.name,
+					name: column.name,
 					unit: getColumnUnit(key, columnUnits),
 				};
 			});

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

@@ -34,6 +34,7 @@ const EXPECTED_QUERY_TYPES: Record<PanelKind, EQueryType[]> = {
 	'signoz/PieChartPanel': [QUERY_BUILDER, CLICKHOUSE],
 	'signoz/TablePanel': [QUERY_BUILDER, CLICKHOUSE],
 	'signoz/ListPanel': [QUERY_BUILDER],
+	'signoz/ScatterPlotPanel': [QUERY_BUILDER, CLICKHOUSE, PROM],
 	// Static kind: no query surface at all.
 	'signoz/TextPanel': [],
 };
@@ -51,6 +52,7 @@ const EXPECTED_SIGNALS: Record<PanelKind, TelemetrytypesSignalDTO[]> = {
 	// List renders raw rows; metrics produce no row data.
 	'signoz/ListPanel': [logs, traces],
 	'signoz/TextPanel': [],
+	'signoz/ScatterPlotPanel': [metrics, logs, traces],
 };
 
 // Exhaustive over PanelKind, so a new kind can't ship without stating how its request is
@@ -112,7 +114,7 @@ const EXPECTED_QUERY_CAPABILITIES: Partial<
 		orderTiebreaker: false,
 		serverPaginated: false,
 	},
-	// Only Table asks the server to transpose its scalar result into UI rows.
+	// Only Table and Scatter Plot ask the server to join their scalar results into UI rows.
 	'signoz/TablePanel': {
 		requestType: scalar,
 		formatTableResultForUI: true,
@@ -120,6 +122,14 @@ const EXPECTED_QUERY_CAPABILITIES: Partial<
 		orderTiebreaker: false,
 		serverPaginated: false,
 	},
+	'signoz/ScatterPlotPanel': {
+		requestType: scalar,
+		formatTableResultForUI: true,
+		bucketedStepInterval: false,
+		orderTiebreaker: false,
+		serverPaginated: false,
+		defaultRowLimit: 10_000,
+	},
 	// Only List reads raw rows, pages them server-side, and needs an order tiebreaker.
 	'signoz/ListPanel': {
 		requestType: raw,

frontend/src/pages/DashboardPage/DashboardContainer/Panels/kinds/ScatterPlotPanel/Renderer.module.scss

@@ -0,0 +1,5 @@
+.chart {
+	flex: 1;
+	min-width: 0;
+	min-height: 0;
+}

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

@@ -0,0 +1,227 @@
+import { useCallback, useMemo, useRef } from 'react';
+import { ChartScatter } from '@signozhq/icons';
+import type { DashboardtypesScatterPlotPanelSpecDTO } from 'api/generated/services/sigNoz.schemas';
+import { useIsDarkMode } from 'hooks/useDarkMode';
+import { useResizeObserver } from 'hooks/useDimensions';
+import type { IRenderTooltipFooterArgs } from 'lib/uPlotV2/components/types';
+import type { ScatterPointLabel } from 'lib/uPlotV2/plugins/ScatterPlugin/types';
+import type { ScatterPointClick } from 'lib/visualization/charts/types';
+import Scatter from 'lib/visualization/charts/Scatter/Scatter';
+import {
+	buildScatterConfig,
+	prepareScatterChartData,
+} from 'lib/visualization/charts/Scatter/utils';
+import TooltipFooter from 'lib/visualization/panels/components/TooltipFooter';
+
+import NoData from '../../components/NoData/NoData';
+import PanelMessage from '../../components/PanelMessage/PanelMessage';
+import PanelStyles from '../../panel.module.scss';
+import type { PanelRendererProps } from '../../types/rendererProps';
+import { mapThresholds } from '../../utils/baseConfigBuilder';
+import { enrichScatterClick } from '../../utils/drilldown/enrichScatterClick';
+import { getBuilderQueries } from '../../utils/getBuilderQueries';
+import { getPanelTimeRange } from '../../utils/getPanelTimeRange';
+import {
+	resolveDecimalPrecision,
+	resolveLegendPosition,
+} from '../../utils/chartAppearance/resolvers';
+import {
+	resolveSelectionPreferencesSource,
+	shouldSaveSelectionPreference,
+} from '../../utils/selectionPreferences';
+
+import { findGroupByMismatch } from './utils/groupByMismatch';
+import { getScatterPlotEmptyMessage } from './utils/messages';
+import { resolvePointOpacity, resolvePointSize } from './utils/points';
+import { prepareScatterPlotData } from './utils/prepareData';
+import { getScatterTable } from './utils/scatterTable';
+import styles from './Renderer.module.scss';
+import { ScatterPlotDataStatus } from './types';
+import { toScatterAxisOptions } from './utils/axisOptions';
+
+function ScatterPlotPanelRenderer({
+	panelId,
+	panel,
+	data,
+	isFetching,
+	refetch,
+	panelMode,
+	onClick,
+	enableDrillDown,
+}: PanelRendererProps<'signoz/ScatterPlotPanel'>): JSX.Element {
+	const graphRef = useRef<HTMLDivElement>(null);
+	const containerDimensions = useResizeObserver(graphRef);
+	const isDarkMode = useIsDarkMode();
+
+	const spec = useMemo<DashboardtypesScatterPlotPanelSpecDTO>(
+		() => panel.spec.plugin.spec,
+		[panel.spec.plugin.spec],
+	);
+
+	const table = useMemo(() => getScatterTable(data), [data]);
+
+	const scatterData = useMemo(
+		() =>
+			prepareScatterPlotData({
+				table,
+				dimensions: spec.dimensions,
+				axes: spec.axes,
+				columnUnits: spec.formatting?.columnUnits ?? {},
+			}),
+		[table, spec.dimensions, spec.axes, spec.formatting?.columnUnits],
+	);
+
+	const decimalPrecision = useMemo(
+		() => resolveDecimalPrecision(spec.formatting?.decimalPrecision),
+		[spec.formatting?.decimalPrecision],
+	);
+
+	const legendPosition = useMemo(
+		() => resolveLegendPosition(spec.legend?.position),
+		[spec.legend?.position],
+	);
+
+	const builderQueries = useMemo(
+		() => getBuilderQueries(panel.spec.queries || []),
+		[panel.spec.queries],
+	);
+
+	const groupByMismatch = useMemo(
+		() => findGroupByMismatch(builderQueries),
+		[builderQueries],
+	);
+
+	const emptyMessage = getScatterPlotEmptyMessage(scatterData, groupByMismatch);
+
+	const readyData =
+		scatterData.status === ScatterPlotDataStatus.Ready &&
+		scatterData.drawnGroups > 0
+			? scatterData
+			: undefined;
+
+	const config = useMemo(
+		() =>
+			readyData
+				? buildScatterConfig({
+						id: panelId,
+						series: readyData.series,
+						isDarkMode,
+						x: toScatterAxisOptions(spec.axes?.x, readyData.channels.x.unit),
+						y: toScatterAxisOptions(spec.axes?.y, readyData.channels.y.unit),
+						pointSize: resolvePointSize(spec.chartAppearance?.points),
+						fillOpacity: resolvePointOpacity(spec.chartAppearance?.points),
+						colorMapping: spec.legend?.customColors ?? {},
+						thresholds: mapThresholds(spec.thresholds),
+						decimalPrecision,
+						selectionPreferencesSource: resolveSelectionPreferencesSource(panelMode),
+						shouldSaveSelectionPreference: shouldSaveSelectionPreference(panelMode),
+					})
+				: undefined,
+		[
+			readyData,
+			panelId,
+			isDarkMode,
+			spec.axes?.x,
+			spec.axes?.y,
+			spec.chartAppearance?.points,
+			spec.legend?.customColors,
+			spec.thresholds,
+			decimalPrecision,
+			panelMode,
+		],
+	);
+
+	const chartData = useMemo(
+		() => (readyData ? prepareScatterChartData(readyData.series) : undefined),
+		[readyData],
+	);
+
+	const resolvePointLabels = useCallback(
+		(seriesIndex: number, dataIndex: number): ScatterPointLabel[] =>
+			readyData?.pointLabels[seriesIndex - 1]?.[dataIndex] ?? [],
+		[readyData],
+	);
+
+	const handlePointClick = useCallback(
+		({ seriesIndex, dataIndex, color, coordinates }: ScatterPointClick): void => {
+			if (!onClick || !readyData) {
+				return;
+			}
+			const payload = enrichScatterClick({
+				labels: readyData.pointLabels[seriesIndex - 1]?.[dataIndex] ?? [],
+				label: readyData.series[seriesIndex - 1]?.label ?? '',
+				color,
+				axisQueries: readyData.axisQueries,
+				builderQueries,
+				coordinates,
+				timeRange: getPanelTimeRange(data.requestPayload),
+			});
+			if (payload) {
+				onClick(payload);
+			}
+		},
+		[onClick, readyData, builderQueries, data.requestPayload],
+	);
+
+	const renderTooltipFooter = useCallback(
+		({ isPinned, dismiss }: IRenderTooltipFooterArgs) => (
+			<TooltipFooter
+				id={panelId}
+				isPinned={isPinned}
+				dismiss={dismiss}
+				canDrilldown={!!enableDrillDown}
+			/>
+		),
+		[panelId, enableDrillDown],
+	);
+
+	return (
+		<div
+			data-testid="scatter-plot-panel-renderer"
+			className={PanelStyles.panelContainer}
+		>
+			{!readyData && emptyMessage && (
+				<PanelMessage
+					icon={<ChartScatter size={18} />}
+					title={emptyMessage.title}
+					description={emptyMessage.description}
+					data-testid="scatter-plot-empty-message"
+				/>
+			)}
+			{!readyData && !emptyMessage && (
+				<NoData isFetching={isFetching} onRetry={refetch} panel={panel} />
+			)}
+			{/* Stays mounted through the empty states: the size observer is bound to this node. */}
+			<div
+				ref={graphRef}
+				className={styles.chart}
+				hidden={!readyData}
+				data-testid="scatter-plot-chart-area"
+			>
+				{readyData &&
+					config &&
+					chartData &&
+					containerDimensions.width > 0 &&
+					containerDimensions.height > 0 && (
+						<Scatter
+							key={panelId}
+							config={config}
+							data={chartData}
+							channels={readyData.channels}
+							resolvePointLabels={resolvePointLabels}
+							legendConfig={{ position: legendPosition }}
+							decimalPrecision={decimalPrecision}
+							canPinTooltip
+							width={containerDimensions.width}
+							height={containerDimensions.height}
+							renderTooltipFooter={renderTooltipFooter}
+							onPointClick={enableDrillDown ? handlePointClick : undefined}
+							data-testid="scatter-plot-chart"
+						/>
+					)}
+			</div>
+		</div>
+	);
+}
+
+export default ScatterPlotPanelRenderer;