feat(dashboard-v2): query & dynamic selectors with dependency orchestration

Query variables fetch options via /variables/query (passing the other variables' values); Dynamic variables fetch live telemetry field values. Dependencies are orchestrated declaratively: a Query selector is enabled only once its parents resolve and its query key carries the parent values, so it refetches when a parent changes and a cyclic dependency is simply never enabled. Options auto-select the default/first value so dependent children always have input.
feat(dashboard-v2): variable selector bar with static selectors
2026-06-11 11:20:32 +01:00 · 2026-06-11 11:52:00 +05:30 · 2026-06-11 10:54:27 +05:30 · 2026-06-11 10:31:31 +05:30 · 2026-06-11 09:54:25 +05:30 · 2026-06-11 09:54:25 +05:30
28 changed files with 2553 additions and 23 deletions
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/DynamicVariableFields.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/DynamicVariableFields.tsx
@@ -0,0 +1,103 @@
+import { useEffect, useMemo, useState } from 'react';
+import { SelectSimple } from '@signozhq/ui/select';
+import { Typography } from '@signozhq/ui/typography';
+import cx from 'classnames';
+// eslint-disable-next-line signoz/no-antd-components -- searchable async select: no @signozhq/ui equivalent
+import { Select } from 'antd';
+import { useGetFieldKeys } from 'hooks/dynamicVariables/useGetFieldKeys';
+import { useGetFieldValues } from 'hooks/dynamicVariables/useGetFieldValues';
+import useDebounce from 'hooks/useDebounce';
+
+import { TELEMETRY_SIGNALS, type TelemetrySignal } from '../variableModel';
+import styles from './VariableForm.module.scss';
+
+interface DynamicVariableFieldsProps {
+	attribute: string;
+	signal: TelemetrySignal;
+	onChange: (patch: {
+		dynamicAttribute?: string;
+		dynamicSignal?: TelemetrySignal;
+	}) => void;
+	onPreview: (values: (string | number)[]) => void;
+}
+
+/** Dynamic-variable body: telemetry signal + field, whose live values preview. */
+function DynamicVariableFields({
+	attribute,
+	signal,
+	onChange,
+	onPreview,
+}: DynamicVariableFieldsProps): JSX.Element {
+	const [search, setSearch] = useState('');
+	const debouncedSearch = useDebounce(search, 300);
+
+	const { data: keyData, isLoading } = useGetFieldKeys({
+		signal,
+		name: debouncedSearch || undefined,
+	});
+
+	// `keys` is a Record keyed BY field name; the field names are the map keys.
+	// When the API reports the list is `complete`, search filters locally.
+	const isComplete = keyData?.data?.complete === true;
+	const options = useMemo(
+		() =>
+			Object.keys(keyData?.data?.keys ?? {}).map((name) => ({
+				label: name,
+				value: name,
+			})),
+		[keyData],
+	);
+
+	const { data: valueData } = useGetFieldValues({
+		signal,
+		name: attribute,
+		enabled: !!attribute,
+	});
+
+	useEffect(() => {
+		const payload = valueData?.data;
+		const values =
+			payload?.normalizedValues ?? payload?.values?.StringValues ?? [];
+		onPreview(values);
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [valueData]);
+
+	return (
+		<>
+			<div className={cx(styles.row, styles.sortSection)}>
+				<div className={styles.labelContainer}>
+					<Typography.Text className={styles.label}>Source</Typography.Text>
+				</div>
+				<SelectSimple
+					className={styles.sortSelect}
+					value={signal}
+					items={TELEMETRY_SIGNALS.map((s) => ({ label: s, value: s }))}
+					onChange={(value): void =>
+						onChange({ dynamicSignal: value as TelemetrySignal })
+					}
+					testId="variable-signal-select"
+				/>
+			</div>
+			<div className={cx(styles.row, styles.sortSection)}>
+				<div className={styles.labelContainer}>
+					<Typography.Text className={styles.label}>Attribute</Typography.Text>
+				</div>
+				<Select
+					className={styles.searchSelect}
+					showSearch
+					value={attribute || undefined}
+					placeholder="Select a telemetry field"
+					loading={isLoading}
+					filterOption={isComplete}
+					onSearch={setSearch}
+					onChange={(value): void => onChange({ dynamicAttribute: value as string })}
+					options={options}
+					notFoundContent={isLoading ? 'Loading…' : 'No fields found'}
+					data-testid="variable-field-select"
+				/>
+			</div>
+		</>
+	);
+}
+
+export default DynamicVariableFields;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/QueryVariableFields.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/QueryVariableFields.tsx
@@ -0,0 +1,93 @@
+import { useState } from 'react';
+import { Button } from '@signozhq/ui/button';
+import { Typography } from '@signozhq/ui/typography';
+import dashboardVariablesQuery from 'api/dashboard/variables/dashboardVariablesQuery';
+import Editor from 'components/Editor';
+import sortValues from 'lib/dashboardVariables/sortVariableValues';
+
+import type { VariableSort } from '../variableModel';
+import styles from './VariableForm.module.scss';
+
+interface QueryVariableFieldsProps {
+	queryValue: string;
+	sort: VariableSort;
+	onChange: (queryValue: string) => void;
+	onPreview: (values: (string | number)[]) => void;
+	onError: (message: string | null) => void;
+}
+
+/** Query-variable body: SQL editor + "Test Run Query" that previews the values. */
+function QueryVariableFields({
+	queryValue,
+	sort,
+	onChange,
+	onPreview,
+	onError,
+}: QueryVariableFieldsProps): JSX.Element {
+	const [isRunning, setIsRunning] = useState(false);
+
+	const runTest = async (): Promise<void> => {
+		setIsRunning(true);
+		onError(null);
+		try {
+			const res = await dashboardVariablesQuery({
+				query: queryValue,
+				variables: {},
+			});
+			if (res.statusCode === 200 && res.payload) {
+				onPreview(
+					sortValues(res.payload.variableValues ?? [], sort) as (string | number)[],
+				);
+			} else {
+				onError(res.error || 'Failed to run query');
+				onPreview([]);
+			}
+		} catch (err) {
+			onError((err as Error).message || 'Failed to run query');
+			onPreview([]);
+		} finally {
+			setIsRunning(false);
+		}
+	};
+
+	return (
+		<div className={styles.queryContainer}>
+			<div className={styles.labelContainer}>
+				<Typography.Text className={styles.label}>Query</Typography.Text>
+			</div>
+			<div className={styles.editorWrap}>
+				<Editor
+					language="sql"
+					value={queryValue}
+					onChange={(value): void => onChange(value)}
+					height="240px"
+					options={{
+						fontSize: 13,
+						wordWrap: 'on',
+						lineNumbers: 'off',
+						glyphMargin: false,
+						folding: false,
+						lineDecorationsWidth: 0,
+						lineNumbersMinChars: 0,
+						minimap: { enabled: false },
+					}}
+				/>
+			</div>
+			<div className={styles.testRow}>
+				<Button
+					variant="solid"
+					color="primary"
+					size="sm"
+					loading={isRunning}
+					disabled={!queryValue}
+					onClick={runTest}
+					testId="variable-test-run"
+				>
+					Test Run Query
+				</Button>
+			</div>
+		</div>
+	);
+}
+
+export default QueryVariableFields;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/VariableForm.module.scss
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/VariableForm.module.scss
@@ -0,0 +1,310 @@
+/* Faithful reproduction of the V1 VariableItem layout, scoped as a module and
+   built on @signozhq components where possible. antd is retained only for the
+   monaco Editor, multiline TextArea, Collapse, and searchable Selects. */
+
+.container {
+	display: flex;
+	flex-direction: column;
+	border: 1px solid var(--l1-border);
+	border-radius: 3px;
+}
+
+.allVariables {
+	display: flex;
+	align-items: center;
+	gap: 8px;
+	padding: 10px 16px;
+	border-bottom: 1px solid var(--l1-border);
+}
+
+.allVariablesBtn {
+	--button-height: 24px;
+	--button-padding: 0;
+	color: var(--muted-foreground);
+}
+
+.content {
+	display: flex;
+	flex-direction: column;
+	gap: 20px;
+	padding: 12px 16px 20px;
+}
+
+/* VariableItemRow */
+.row {
+	display: flex;
+	gap: 1rem;
+	margin-bottom: 0;
+}
+
+/* LabelContainer */
+.labelContainer {
+	width: 200px;
+}
+
+.label {
+	color: var(--l2-foreground);
+	font-family: Inter;
+	font-size: 14px;
+	font-weight: 400;
+	line-height: 20px;
+}
+
+.column {
+	flex-direction: column;
+	gap: 8px;
+}
+
+.input,
+.textarea,
+.defaultInput {
+	padding: 6px 6px 6px 8px;
+	border: 1px solid var(--l1-border);
+	border-radius: 2px;
+	background: var(--l3-background);
+}
+
+.input,
+.textarea {
+	width: 100%;
+}
+
+.defaultInput {
+	width: 342px;
+}
+
+.errorText {
+	font-size: 12px;
+	color: var(--bg-amber-500);
+}
+
+/* Variable type segmented group */
+.typeSection {
+	align-items: center;
+	justify-content: space-between;
+}
+
+.typeLabelContainer {
+	display: flex;
+	align-items: center;
+	gap: 8px;
+	width: auto;
+}
+
+.typeBtnGroup {
+	display: grid;
+	grid-template-columns: repeat(4, max-content);
+	height: 32px;
+	flex-shrink: 0;
+	border: 1px solid var(--l1-border);
+	border-radius: 2px;
+	background: var(--l2-background);
+	box-shadow: 0 0 8px 0 rgba(0, 0, 0, 0.1);
+}
+
+.typeBtn {
+	--button-height: 32px;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	gap: 4px;
+	min-width: 114px;
+	border-radius: 0;
+	color: var(--l2-foreground);
+
+	& + & {
+		border-left: 1px solid var(--l1-border);
+	}
+}
+
+.typeBtnSelected {
+	background: var(--l1-border);
+	color: var(--l1-foreground);
+}
+
+.betaTag {
+	margin-left: 4px;
+}
+
+/* Query */
+.queryContainer {
+	display: flex;
+	flex-flow: column wrap;
+	gap: 1rem;
+	min-width: 0;
+	margin-bottom: 0;
+}
+
+.editorWrap {
+	height: 240px;
+	overflow: hidden;
+	border: 1px solid var(--l1-border);
+	border-radius: 2px;
+}
+
+.testRow {
+	display: flex;
+	margin-top: 8px;
+}
+
+/* Custom — antd Collapse */
+.customSection {
+	margin-bottom: 0;
+}
+
+.customSection :global(.custom-collapse) {
+	width: 100%;
+	border: 1px solid var(--l1-border);
+	border-radius: 3px 3px 0 0;
+
+	:global(.ant-collapse-item) {
+		border-bottom: none;
+	}
+
+	:global(.ant-collapse-header) {
+		align-items: center;
+		gap: 8px;
+		height: 38px;
+		padding: 12px;
+		background: var(--l3-background);
+		border-radius: 3px 3px 0 0;
+	}
+
+	:global(.ant-collapse-header-text) {
+		display: flex;
+		align-items: center;
+		gap: 10px;
+		padding: 1px 2px;
+		color: var(--bg-robin-400);
+		font-family: 'Space Mono';
+		font-size: 14px;
+		line-height: 18px;
+		border-radius: 2px;
+		background: color-mix(in srgb, var(--bg-robin-400) 8%, transparent);
+	}
+
+	:global(.ant-collapse-content-box) {
+		padding: 0;
+	}
+
+	:global(.comma-input) {
+		height: 109px;
+		border: none;
+	}
+}
+
+/* Textbox */
+.textboxSection {
+	align-items: center;
+	justify-content: space-between;
+	margin-bottom: 0;
+}
+
+/* Preview strip */
+.previewSection {
+	display: flex;
+	flex-direction: column;
+	gap: 8px;
+	min-height: 88px;
+	margin-bottom: 0;
+	padding-bottom: 8px;
+	border: 1px solid var(--l1-border);
+	border-radius: 3px;
+}
+
+.previewLabel {
+	align-self: flex-start;
+	display: inline-flex;
+	align-items: center;
+	gap: 10px;
+	padding: 4px 8px;
+	color: var(--bg-robin-400);
+	font-family: 'Space Mono';
+	font-size: 14px;
+	line-height: 18px;
+	border-radius: 3px 0 2px;
+	background: color-mix(in srgb, var(--bg-robin-400) 8%, transparent);
+}
+
+.previewValues {
+	display: flex;
+	flex-flow: wrap;
+	gap: 8px;
+	padding: 4.5px 11px;
+	overflow-y: auto;
+}
+
+.previewValues [data-slot='badge'] {
+	height: 30px;
+	align-items: center;
+	color: var(--l1-foreground);
+	font-family: 'Space Mono';
+	font-size: 14px;
+	border: 1px solid var(--l1-border);
+	border-radius: 2px;
+}
+
+.previewError {
+	color: var(--bg-amber-500);
+}
+
+/* Sort / multi / all / default rows */
+.sortSection,
+.multiSection,
+.allOptionSection,
+.dynamicSection {
+	align-items: flex-start;
+	justify-content: space-between;
+	margin-bottom: 0;
+}
+
+.sortSection {
+	align-items: center;
+}
+
+.rowLabel {
+	width: 339px;
+	color: var(--l2-foreground);
+	font-family: Inter;
+	font-size: 14px;
+	line-height: 20px;
+	letter-spacing: -0.07px;
+}
+
+.sortSelect {
+	width: 192px;
+}
+
+.defaultValueSection {
+	display: grid;
+	grid-template-columns: max-content 1fr;
+	gap: 1rem;
+	align-items: center;
+	margin-bottom: 0;
+}
+
+.defaultValueSection .label {
+	display: block;
+	margin-bottom: 2px;
+}
+
+.defaultValueDesc {
+	display: block;
+	color: var(--l2-foreground);
+	font-family: Inter;
+	font-size: 11px;
+	line-height: 18px;
+	letter-spacing: -0.06px;
+}
+
+.searchSelect {
+	width: 100%;
+}
+
+/* Footer */
+.footer {
+	display: flex;
+	justify-content: flex-end;
+	gap: 1rem;
+	margin-top: 12px;
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/VariableForm.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/VariableForm.tsx
@@ -0,0 +1,351 @@
+import { useEffect, useState } from 'react';
+import { ArrowLeft, Check, X } from '@signozhq/icons';
+import { Badge } from '@signozhq/ui/badge';
+import { Button } from '@signozhq/ui/button';
+import { Input } from '@signozhq/ui/input';
+import { SelectSimple } from '@signozhq/ui/select';
+import { Switch } from '@signozhq/ui/switch';
+import { Typography } from '@signozhq/ui/typography';
+import cx from 'classnames';
+// eslint-disable-next-line signoz/no-antd-components -- TextArea/Collapse/searchable Select: no @signozhq/ui equivalent
+import { Collapse, Input as AntdInput, Select } from 'antd';
+import { commaValuesParser } from 'lib/dashboardVariables/customCommaValuesParser';
+import sortValues from 'lib/dashboardVariables/sortVariableValues';
+
+import {
+	VARIABLE_SORTS,
+	type VariableFormModel,
+	type VariableSort,
+	type VariableType,
+} from '../variableModel';
+import DynamicVariableFields from './DynamicVariableFields';
+import QueryVariableFields from './QueryVariableFields';
+import VariableTypeSelector from './VariableTypeSelector';
+import styles from './VariableForm.module.scss';
+
+const SORT_LABEL: Record<VariableSort, string> = {
+	DISABLED: 'Disabled',
+	ASC: 'Ascending',
+	DESC: 'Descending',
+};
+
+function getNameError(name: string, existingNames: string[]): string | null {
+	if (name === '') {
+		return 'Variable name is required';
+	}
+	if (/\s/.test(name)) {
+		return 'Variable name cannot contain whitespaces';
+	}
+	if (existingNames.includes(name)) {
+		return 'Variable name already exists';
+	}
+	return null;
+}
+
+interface VariableFormProps {
+	initial: VariableFormModel;
+	/** Names of the other variables, for uniqueness validation. */
+	existingNames: string[];
+	isSaving: boolean;
+	onClose: () => void;
+	onSave: (model: VariableFormModel) => void;
+}
+
+/**
+ * In-drawer variable editor reproducing the V1 VariableItem layout, built on
+ * @signozhq components (antd kept only for the monaco editor, TextArea, Collapse
+ * and searchable selects). Master→detail: renders in place of the list.
+ */
+function VariableForm({
+	initial,
+	existingNames,
+	isSaving,
+	onClose,
+	onSave,
+}: VariableFormProps): JSX.Element {
+	const [model, setModel] = useState<VariableFormModel>(initial);
+	const [previewValues, setPreviewValues] = useState<(string | number)[]>([]);
+	const [previewError, setPreviewError] = useState<string | null>(null);
+	const [defaultValue, setDefaultValue] = useState<string>(
+		((initial.defaultValue as { value?: string })?.value ?? '') as string,
+	);
+
+	useEffect(() => {
+		setModel(initial);
+		setPreviewValues([]);
+		setPreviewError(null);
+		setDefaultValue(
+			((initial.defaultValue as { value?: string })?.value ?? '') as string,
+		);
+	}, [initial]);
+
+	const set = (patch: Partial<VariableFormModel>): void =>
+		setModel((prev) => ({ ...prev, ...patch }));
+
+	const selectType = (type: VariableType): void => {
+		set({ type });
+		setPreviewValues([]);
+		setPreviewError(null);
+	};
+
+	const onCustomChange = (value: string): void => {
+		set({ customValue: value });
+		setPreviewValues(
+			sortValues(commaValuesParser(value), model.sort) as (string | number)[],
+		);
+	};
+
+	const trimmedName = model.name.trim();
+	const nameError = getNameError(trimmedName, existingNames);
+
+	const isListType =
+		model.type === 'QUERY' || model.type === 'CUSTOM' || model.type === 'DYNAMIC';
+	const showAllOptionField = model.type === 'QUERY' || model.type === 'CUSTOM';
+
+	const handleSave = (): void => {
+		onSave({
+			...model,
+			name: trimmedName,
+			defaultValue: defaultValue ? { value: defaultValue } : undefined,
+		});
+	};
+
+	return (
+		<>
+			<div className={styles.container}>
+				<div className={styles.allVariables}>
+					<Button
+						variant="ghost"
+						color="secondary"
+						className={styles.allVariablesBtn}
+						prefix={<ArrowLeft size={14} />}
+						onClick={onClose}
+						testId="variable-form-back"
+					>
+						All variables
+					</Button>
+				</div>
+
+				<div className={styles.content}>
+					{/* Name */}
+					<div className={cx(styles.row, styles.column)}>
+						<Typography.Text className={styles.label}>Name</Typography.Text>
+						<Input
+							className={styles.input}
+							value={model.name}
+							placeholder="Unique name of the variable"
+							onChange={(e): void => set({ name: e.target.value })}
+							testId="variable-name-input"
+						/>
+						{nameError ? (
+							<Typography.Text className={styles.errorText}>
+								{nameError}
+							</Typography.Text>
+						) : null}
+					</div>
+
+					{/* Description */}
+					<div className={cx(styles.row, styles.column)}>
+						<Typography.Text className={styles.label}>Description</Typography.Text>
+						<AntdInput.TextArea
+							className={styles.textarea}
+							value={model.description}
+							placeholder="Enter a description for the variable"
+							rows={3}
+							onChange={(e): void => set({ description: e.target.value })}
+							data-testid="variable-description-input"
+						/>
+					</div>
+
+					{/* Variable Type */}
+					<VariableTypeSelector value={model.type} onChange={selectType} />
+
+					{/* Type-specific body */}
+					{model.type === 'DYNAMIC' ? (
+						<DynamicVariableFields
+							attribute={model.dynamicAttribute}
+							signal={model.dynamicSignal}
+							onChange={(patch): void => set(patch)}
+							onPreview={setPreviewValues}
+						/>
+					) : null}
+
+					{model.type === 'QUERY' ? (
+						<QueryVariableFields
+							queryValue={model.queryValue}
+							sort={model.sort}
+							onChange={(queryValue): void => set({ queryValue })}
+							onPreview={setPreviewValues}
+							onError={setPreviewError}
+						/>
+					) : null}
+
+					{model.type === 'CUSTOM' ? (
+						<div className={cx(styles.row, styles.customSection)}>
+							<Collapse
+								collapsible="header"
+								rootClassName="custom-collapse"
+								defaultActiveKey={['1']}
+								items={[
+									{
+										key: '1',
+										label: 'Options',
+										children: (
+											<AntdInput.TextArea
+												value={model.customValue}
+												placeholder="Enter options separated by commas."
+												rootClassName="comma-input"
+												onChange={(e): void => onCustomChange(e.target.value)}
+												data-testid="variable-custom-input"
+											/>
+										),
+									},
+								]}
+							/>
+						</div>
+					) : null}
+
+					{model.type === 'TEXT' ? (
+						<div className={cx(styles.row, styles.textboxSection)}>
+							<div className={styles.labelContainer}>
+								<Typography.Text className={styles.label}>
+									Default Value
+								</Typography.Text>
+							</div>
+							<Input
+								className={styles.defaultInput}
+								value={model.textValue}
+								placeholder="Enter a default value (if any)..."
+								onChange={(e): void => set({ textValue: e.target.value })}
+								testId="variable-text-input"
+							/>
+						</div>
+					) : null}
+
+					{/* Shared rows for list-type variables */}
+					{isListType ? (
+						<>
+							<div className={cx(styles.row, styles.previewSection)}>
+								<Typography.Text className={styles.previewLabel}>
+									Preview of Values
+								</Typography.Text>
+								<div className={styles.previewValues}>
+									{previewError ? (
+										<Typography.Text className={styles.previewError}>
+											{previewError}
+										</Typography.Text>
+									) : (
+										previewValues.map((value, idx) => (
+											<Badge
+												// eslint-disable-next-line react/no-array-index-key -- preview values are display-only and may contain duplicates
+												key={`${value}-${idx}`}
+												color="vanilla"
+											>
+												{value.toString()}
+											</Badge>
+										))
+									)}
+								</div>
+							</div>
+
+							<div className={cx(styles.row, styles.sortSection)}>
+								<div className={styles.labelContainer}>
+									<Typography.Text className={styles.label}>Sort Values</Typography.Text>
+								</div>
+								<SelectSimple
+									className={styles.sortSelect}
+									value={model.sort}
+									items={VARIABLE_SORTS.map((sort) => ({
+										label: SORT_LABEL[sort],
+										value: sort,
+									}))}
+									onChange={(value): void => set({ sort: value as VariableSort })}
+									testId="variable-sort-select"
+								/>
+							</div>
+
+							<div className={cx(styles.row, styles.multiSection)}>
+								<Typography.Text className={styles.rowLabel}>
+									Enable multiple values to be checked
+								</Typography.Text>
+								<Switch
+									value={model.multiSelect}
+									onChange={(checked): void => {
+										set({
+											multiSelect: checked,
+											showAllOption: checked ? model.showAllOption : false,
+										});
+									}}
+									testId="variable-multi-switch"
+								/>
+							</div>
+
+							{model.multiSelect && showAllOptionField ? (
+								<div className={cx(styles.row, styles.allOptionSection)}>
+									<Typography.Text className={styles.rowLabel}>
+										Include an option for ALL values
+									</Typography.Text>
+									<Switch
+										value={model.showAllOption}
+										onChange={(checked): void => set({ showAllOption: checked })}
+										testId="variable-all-switch"
+									/>
+								</div>
+							) : null}
+
+							<div className={cx(styles.row, styles.defaultValueSection)}>
+								<div className={styles.labelContainer}>
+									<Typography.Text className={styles.label}>
+										Default Value
+									</Typography.Text>
+									<Typography.Text className={styles.defaultValueDesc}>
+										{model.type === 'QUERY'
+											? 'Click Test Run Query to see the values or add custom value'
+											: 'Select a value from the preview values or add custom value'}
+									</Typography.Text>
+								</div>
+								<Select
+									className={styles.searchSelect}
+									showSearch
+									allowClear
+									placeholder="Select a default value"
+									value={defaultValue || undefined}
+									onChange={(value): void => setDefaultValue(value ?? '')}
+									options={previewValues.map((value) => ({
+										label: value.toString(),
+										value: value.toString(),
+									}))}
+									data-testid="variable-default-select"
+								/>
+							</div>
+						</>
+					) : null}
+				</div>
+			</div>
+
+			<div className={styles.footer}>
+				<Button
+					variant="solid"
+					color="secondary"
+					prefix={<X size={14} />}
+					onClick={onClose}
+				>
+					Discard
+				</Button>
+				<Button
+					variant="solid"
+					color="primary"
+					prefix={<Check size={14} />}
+					disabled={!!nameError}
+					loading={isSaving}
+					onClick={handleSave}
+					testId="variable-save"
+				>
+					Save Variable
+				</Button>
+			</div>
+		</>
+	);
+}
+
+export default VariableForm;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/VariableTypeSelector.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariableForm/VariableTypeSelector.tsx
@@ -0,0 +1,99 @@
+import {
+	ClipboardType,
+	DatabaseZap,
+	Info,
+	LayoutList,
+	Pyramid,
+} from '@signozhq/icons';
+import { Badge } from '@signozhq/ui/badge';
+import { Button } from '@signozhq/ui/button';
+import { Typography } from '@signozhq/ui/typography';
+import cx from 'classnames';
+import TextToolTip from 'components/TextToolTip';
+
+import type { VariableType } from '../variableModel';
+import styles from './VariableForm.module.scss';
+
+interface VariableTypeSelectorProps {
+	value: VariableType;
+	onChange: (type: VariableType) => void;
+}
+
+/** The segmented Dynamic / Textbox / Custom / Query type picker. */
+function VariableTypeSelector({
+	value,
+	onChange,
+}: VariableTypeSelectorProps): JSX.Element {
+	return (
+		<div className={cx(styles.row, styles.typeSection)}>
+			<div className={styles.typeLabelContainer}>
+				<Typography.Text className={styles.label}>Variable Type</Typography.Text>
+				<TextToolTip
+					text="Learn more about supported variable types"
+					url="https://signoz.io/docs/userguide/manage-variables/#supported-variable-types"
+					urlText="here"
+					useFilledIcon={false}
+					outlinedIcon={<Info size={14} />}
+				/>
+			</div>
+			<div className={styles.typeBtnGroup}>
+				<Button
+					variant="ghost"
+					color="secondary"
+					prefix={<Pyramid size={14} />}
+					className={cx(styles.typeBtn, {
+						[styles.typeBtnSelected]: value === 'DYNAMIC',
+					})}
+					onClick={(): void => onChange('DYNAMIC')}
+					testId="variable-type-dynamic"
+				>
+					Dynamic
+					<Badge color="robin" className={styles.betaTag}>
+						Beta
+					</Badge>
+				</Button>
+				<Button
+					variant="ghost"
+					color="secondary"
+					prefix={<ClipboardType size={14} />}
+					className={cx(styles.typeBtn, {
+						[styles.typeBtnSelected]: value === 'TEXT',
+					})}
+					onClick={(): void => onChange('TEXT')}
+					testId="variable-type-textbox"
+				>
+					Textbox
+				</Button>
+				<Button
+					variant="ghost"
+					color="secondary"
+					prefix={<LayoutList size={14} />}
+					className={cx(styles.typeBtn, {
+						[styles.typeBtnSelected]: value === 'CUSTOM',
+					})}
+					onClick={(): void => onChange('CUSTOM')}
+					testId="variable-type-custom"
+				>
+					Custom
+				</Button>
+				<Button
+					variant="ghost"
+					color="secondary"
+					prefix={<DatabaseZap size={14} />}
+					className={cx(styles.typeBtn, {
+						[styles.typeBtnSelected]: value === 'QUERY',
+					})}
+					onClick={(): void => onChange('QUERY')}
+					testId="variable-type-query"
+				>
+					Query
+					<Badge color="amber" className={styles.betaTag}>
+						Not Recommended
+					</Badge>
+				</Button>
+			</div>
+		</div>
+	);
+}
+
+export default VariableTypeSelector;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/Variables.module.scss
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/Variables.module.scss
@@ -0,0 +1,101 @@
+.container {
+	display: flex;
+	flex-direction: column;
+	gap: 16px;
+	padding: 20px 16px;
+}
+
+.header {
+	display: flex;
+	align-items: flex-start;
+	justify-content: space-between;
+	gap: 16px;
+}
+
+.titleRow {
+	display: flex;
+	align-items: baseline;
+	flex-wrap: wrap;
+	gap: 8px;
+}
+
+.title {
+	font-size: 14px;
+	font-weight: 500;
+	color: var(--l1-foreground);
+}
+
+.subtitle {
+	font-size: 12px;
+	color: var(--l2-foreground);
+}
+
+.empty {
+	padding: 32px;
+	text-align: center;
+	border: 1px dashed var(--l1-border);
+	border-radius: 4px;
+	color: var(--l2-foreground);
+}
+
+.list {
+	display: flex;
+	flex-direction: column;
+	gap: 8px;
+}
+
+.row {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	gap: 12px;
+	padding: 10px 12px;
+	border: 1px solid var(--l1-border);
+	border-radius: 4px;
+	background: var(--l1-background);
+}
+
+.rowMain {
+	display: flex;
+	align-items: center;
+	gap: 10px;
+	min-width: 0;
+}
+
+.varName {
+	font-weight: 500;
+	color: var(--l1-foreground);
+}
+
+.varDesc {
+	min-width: 0;
+	overflow: hidden;
+	font-size: 12px;
+	color: var(--l2-foreground);
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.typeTag {
+	flex-shrink: 0;
+	padding: 1px 8px;
+	font-size: 11px;
+	letter-spacing: 0.04em;
+	color: var(--l2-foreground);
+	text-transform: uppercase;
+	background: var(--l2-background);
+	border-radius: 10px;
+}
+
+.rowActions {
+	display: flex;
+	flex-shrink: 0;
+	align-items: center;
+	gap: 2px;
+}
+
+.confirmText {
+	margin-right: 4px;
+	font-size: 12px;
+	color: var(--l2-foreground);
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariablesList.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/VariablesList.tsx
@@ -0,0 +1,139 @@
+import {
+	Check,
+	ChevronDown,
+	ChevronUp,
+	PenLine,
+	Trash2,
+	X,
+} from '@signozhq/icons';
+import { Button } from '@signozhq/ui/button';
+import { Typography } from '@signozhq/ui/typography';
+
+import type { VariableFormModel } from './variableModel';
+import styles from './Variables.module.scss';
+
+const TYPE_LABEL: Record<VariableFormModel['type'], string> = {
+	QUERY: 'Query',
+	CUSTOM: 'Custom',
+	TEXT: 'Text',
+	DYNAMIC: 'Dynamic',
+};
+
+interface VariablesListProps {
+	variables: VariableFormModel[];
+	canEdit: boolean;
+	/** Index whose delete is awaiting inline confirmation, if any. */
+	confirmingIndex: number | null;
+	onEdit: (index: number) => void;
+	onRequestDelete: (index: number) => void;
+	onConfirmDelete: (index: number) => void;
+	onCancelDelete: () => void;
+	onMove: (from: number, to: number) => void;
+}
+
+function VariablesList({
+	variables,
+	canEdit,
+	confirmingIndex,
+	onEdit,
+	onRequestDelete,
+	onConfirmDelete,
+	onCancelDelete,
+	onMove,
+}: VariablesListProps): JSX.Element {
+	return (
+		<div className={styles.list} data-testid="variables-list">
+			{variables.map((variable, index) => (
+				<div
+					className={styles.row}
+					key={variable.name || `variable-${index}`}
+					data-testid={`variable-row-${variable.name}`}
+				>
+					<div className={styles.rowMain}>
+						<Typography.Text className={styles.varName}>
+							${variable.name}
+						</Typography.Text>
+						<span className={styles.typeTag}>{TYPE_LABEL[variable.type]}</span>
+						{variable.description ? (
+							<Typography.Text className={styles.varDesc}>
+								{variable.description}
+							</Typography.Text>
+						) : null}
+					</div>
+
+					{canEdit && confirmingIndex === index ? (
+						<div className={styles.rowActions}>
+							<Typography.Text className={styles.confirmText}>Delete?</Typography.Text>
+							<Button
+								variant="ghost"
+								color="destructive"
+								size="icon"
+								onClick={(): void => onConfirmDelete(index)}
+								aria-label="Confirm delete"
+								testId={`variable-delete-confirm-${variable.name}`}
+							>
+								<Check size={14} />
+							</Button>
+							<Button
+								variant="ghost"
+								color="secondary"
+								size="icon"
+								onClick={onCancelDelete}
+								aria-label="Cancel delete"
+							>
+								<X size={14} />
+							</Button>
+						</div>
+					) : null}
+
+					{canEdit && confirmingIndex !== index ? (
+						<div className={styles.rowActions}>
+							<Button
+								variant="ghost"
+								color="secondary"
+								size="icon"
+								disabled={index === 0}
+								onClick={(): void => onMove(index, index - 1)}
+								aria-label="Move up"
+							>
+								<ChevronUp size={14} />
+							</Button>
+							<Button
+								variant="ghost"
+								color="secondary"
+								size="icon"
+								disabled={index === variables.length - 1}
+								onClick={(): void => onMove(index, index + 1)}
+								aria-label="Move down"
+							>
+								<ChevronDown size={14} />
+							</Button>
+							<Button
+								variant="ghost"
+								color="secondary"
+								size="icon"
+								onClick={(): void => onEdit(index)}
+								aria-label="Edit variable"
+								testId={`variable-edit-${variable.name}`}
+							>
+								<PenLine size={14} />
+							</Button>
+							<Button
+								variant="ghost"
+								color="secondary"
+								size="icon"
+								onClick={(): void => onRequestDelete(index)}
+								aria-label="Delete variable"
+								testId={`variable-delete-${variable.name}`}
+							>
+								<Trash2 size={14} />
+							</Button>
+						</div>
+					) : null}
+				</div>
+			))}
+		</div>
+	);
+}
+
+export default VariablesList;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/index.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/index.tsx
@@ -0,0 +1,147 @@
+import { useEffect, useMemo, useState } from 'react';
+import { Plus } from '@signozhq/icons';
+import { Button } from '@signozhq/ui/button';
+import { Typography } from '@signozhq/ui/typography';
+import type { DashboardtypesGettableDashboardV2DTO } from 'api/generated/services/sigNoz.schemas';
+
+import { useDashboardStore } from '../../store/useDashboardStore';
+import { useSaveVariables } from './useSaveVariables';
+import { dtoToFormModel } from './variableAdapters';
+import {
+	emptyVariableFormModel,
+	type VariableFormModel,
+} from './variableModel';
+import VariableForm from './VariableForm/VariableForm';
+import VariablesList from './VariablesList';
+import styles from './Variables.module.scss';
+
+interface VariablesSettingsProps {
+	dashboard: DashboardtypesGettableDashboardV2DTO;
+}
+
+/** `null` index = adding a new variable; a number = editing that row. */
+type EditingState = { index: number | null } | null;
+
+function VariablesSettings({ dashboard }: VariablesSettingsProps): JSX.Element {
+	const isEditable = useDashboardStore((s) => s.isEditable);
+	const { save, isSaving } = useSaveVariables();
+
+	const initialModels = useMemo(
+		() => (dashboard.spec?.variables ?? []).map(dtoToFormModel),
+		[dashboard.spec?.variables],
+	);
+	const [variables, setVariables] = useState<VariableFormModel[]>(initialModels);
+
+	// Resync from the dashboard after a save round-trips (refetch bumps updatedAt).
+	useEffect(() => {
+		setVariables(initialModels);
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [dashboard.updatedAt]);
+
+	const [editing, setEditing] = useState<EditingState>(null);
+	const [confirmDeleteIndex, setConfirmDeleteIndex] = useState<number | null>(
+		null,
+	);
+
+	const editingModel: VariableFormModel | null = useMemo(() => {
+		if (!editing) {
+			return null;
+		}
+		return editing.index === null
+			? emptyVariableFormModel()
+			: variables[editing.index];
+	}, [editing, variables]);
+
+	const existingNames = useMemo(() => {
+		const self = editing?.index ?? null;
+		return variables.filter((_, i) => i !== self).map((v) => v.name);
+	}, [variables, editing]);
+
+	const persist = (next: VariableFormModel[]): void => {
+		setVariables(next);
+		void save(next);
+	};
+
+	const handleFormSave = (model: VariableFormModel): void => {
+		const next = [...variables];
+		if (editing?.index == null) {
+			next.push(model);
+		} else {
+			next[editing.index] = model;
+		}
+		setEditing(null);
+		persist(next);
+	};
+
+	const handleMove = (from: number, to: number): void => {
+		if (to < 0 || to >= variables.length) {
+			return;
+		}
+		const next = [...variables];
+		const [moved] = next.splice(from, 1);
+		next.splice(to, 0, moved);
+		persist(next);
+	};
+
+	const handleConfirmDelete = (index: number): void => {
+		persist(variables.filter((_, i) => i !== index));
+		setConfirmDeleteIndex(null);
+	};
+
+	// Detail view — edit/new form replaces the list in place (no modal).
+	if (editingModel) {
+		return (
+			<VariableForm
+				initial={editingModel}
+				existingNames={existingNames}
+				isSaving={isSaving}
+				onClose={(): void => setEditing(null)}
+				onSave={handleFormSave}
+			/>
+		);
+	}
+
+	// Master view — the variables list.
+	return (
+		<div className={styles.container}>
+			<div className={styles.header}>
+				<div className={styles.titleRow}>
+					<Typography.Text className={styles.title}>Variables</Typography.Text>
+					<Typography.Text className={styles.subtitle}>
+						Define variables to parameterize panel queries.
+					</Typography.Text>
+				</div>
+				{isEditable ? (
+					<Button
+						variant="solid"
+						color="primary"
+						prefix={<Plus size={14} />}
+						onClick={(): void => setEditing({ index: null })}
+						testId="add-variable"
+					>
+						New variable
+					</Button>
+				) : null}
+			</div>
+
+			{variables.length === 0 ? (
+				<div className={styles.empty}>
+					<Typography.Text>No variables defined yet.</Typography.Text>
+				</div>
+			) : (
+				<VariablesList
+					variables={variables}
+					canEdit={isEditable}
+					confirmingIndex={confirmDeleteIndex}
+					onEdit={(index): void => setEditing({ index })}
+					onRequestDelete={(index): void => setConfirmDeleteIndex(index)}
+					onConfirmDelete={handleConfirmDelete}
+					onCancelDelete={(): void => setConfirmDeleteIndex(null)}
+					onMove={handleMove}
+				/>
+			)}
+		</div>
+	);
+}
+
+export default VariablesSettings;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/useSaveVariables.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/useSaveVariables.ts
@@ -0,0 +1,51 @@
+import { useCallback, useState } from 'react';
+import { patchDashboardV2 } from 'api/generated/services/dashboard';
+import { toast } from '@signozhq/ui/sonner';
+import { useErrorModal } from 'providers/ErrorModalProvider';
+import APIError from 'types/api/error';
+
+import { useDashboardStore } from '../../store/useDashboardStore';
+import { formModelToDto } from './variableAdapters';
+import type { VariableFormModel } from './variableModel';
+import { buildVariablesPatch } from './variablePatchOps';
+
+interface UseSaveVariables {
+	save: (variables: VariableFormModel[]) => Promise<boolean>;
+	isSaving: boolean;
+}
+
+/**
+ * Persists the dashboard's variable list via a single `/spec/variables` patch,
+ * then refetches. Mirrors the General-settings save flow (patch → toast →
+ * refetch → surface errors).
+ */
+export function useSaveVariables(): UseSaveVariables {
+	const dashboardId = useDashboardStore((s) => s.dashboardId);
+	const refetch = useDashboardStore((s) => s.refetch);
+	const { showErrorModal } = useErrorModal();
+	const [isSaving, setIsSaving] = useState(false);
+
+	const save = useCallback(
+		async (variables: VariableFormModel[]): Promise<boolean> => {
+			if (!dashboardId) {
+				return false;
+			}
+			const dtos = variables.map(formModelToDto);
+			try {
+				setIsSaving(true);
+				await patchDashboardV2({ id: dashboardId }, buildVariablesPatch(dtos));
+				toast.success('Variables updated');
+				refetch();
+				return true;
+			} catch (error) {
+				showErrorModal(error as APIError);
+				return false;
+			} finally {
+				setIsSaving(false);
+			}
+		},
+		[dashboardId, refetch, showErrorModal],
+	);
+
+	return { save, isSaving };
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/variableAdapters.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/variableAdapters.ts
@@ -0,0 +1,154 @@
+import {
+	DashboardtypesVariableEnvelopeGithubComPersesSpecGoDashboardTextVariableSpecDTOKind as TextEnvelopeKind,
+	DashboardtypesVariableEnvelopeGithubComSigNozSignozPkgTypesDashboardtypesListVariableSpecDTOKind as ListEnvelopeKind,
+	DashboardtypesVariablePluginVariantGithubComSigNozSignozPkgTypesDashboardtypesCustomVariableSpecDTOKind as CustomPluginKind,
+	DashboardtypesVariablePluginVariantGithubComSigNozSignozPkgTypesDashboardtypesDynamicVariableSpecDTOKind as DynamicPluginKind,
+	DashboardtypesVariablePluginVariantGithubComSigNozSignozPkgTypesDashboardtypesQueryVariableSpecDTOKind as QueryPluginKind,
+	TelemetrytypesSignalDTO,
+} from 'api/generated/services/sigNoz.schemas';
+import type {
+	DashboardtypesListVariableSpecDTO,
+	DashboardtypesVariableDTO,
+	DashboardtypesVariablePluginDTO,
+	DashboardTextVariableSpecDTO,
+} from 'api/generated/services/sigNoz.schemas';
+
+import {
+	emptyVariableFormModel,
+	PLUGIN_KIND,
+	type TelemetrySignal,
+	type VariableFormModel,
+	type VariableSort,
+} from './variableModel';
+
+/** DTO envelope → flat form model (for display / editing). */
+export function dtoToFormModel(
+	dto: DashboardtypesVariableDTO,
+): VariableFormModel {
+	const base = emptyVariableFormModel();
+	const display = dto.spec?.display;
+	const common: VariableFormModel = {
+		...base,
+		name: dto.spec?.name ?? display?.name ?? '',
+		description: display?.description ?? '',
+		hidden: display?.hidden ?? false,
+	};
+
+	// Text variable — a distinct envelope (no list plugin).
+	if (dto.kind === TextEnvelopeKind.TextVariable) {
+		const spec = dto.spec as DashboardTextVariableSpecDTO;
+		return {
+			...common,
+			type: 'TEXT',
+			textValue: spec.value ?? '',
+			textConstant: spec.constant ?? false,
+		};
+	}
+
+	// List variable — Query / Custom / Dynamic, distinguished by plugin.kind.
+	const spec = dto.spec as DashboardtypesListVariableSpecDTO;
+	const listCommon: VariableFormModel = {
+		...common,
+		multiSelect: spec.allowMultiple ?? false,
+		showAllOption: spec.allowAllValue ?? false,
+		sort: (spec.sort as VariableSort) ?? 'DISABLED',
+		defaultValue: spec.defaultValue,
+	};
+	const plugin = spec.plugin;
+
+	if (plugin?.kind === CustomPluginKind['signoz/CustomVariable']) {
+		return {
+			...listCommon,
+			type: 'CUSTOM',
+			customValue: plugin.spec.customValue ?? '',
+		};
+	}
+	if (plugin?.kind === DynamicPluginKind['signoz/DynamicVariable']) {
+		return {
+			...listCommon,
+			type: 'DYNAMIC',
+			dynamicAttribute: plugin.spec.name ?? '',
+			dynamicSignal: (plugin.spec.signal as TelemetrySignal) ?? 'traces',
+		};
+	}
+	// Default to Query (also covers a query plugin or a missing/unknown plugin).
+	return {
+		...listCommon,
+		type: 'QUERY',
+		queryValue:
+			plugin?.kind === QueryPluginKind['signoz/QueryVariable']
+				? (plugin.spec.queryValue ?? '')
+				: '',
+	};
+}
+
+function buildPlugin(
+	model: VariableFormModel,
+): DashboardtypesVariablePluginDTO {
+	switch (model.type) {
+		case 'CUSTOM':
+			return {
+				kind: CustomPluginKind['signoz/CustomVariable'],
+				spec: { customValue: model.customValue },
+			};
+		case 'DYNAMIC':
+			return {
+				kind: DynamicPluginKind['signoz/DynamicVariable'],
+				spec: {
+					name: model.dynamicAttribute,
+					signal: model.dynamicSignal as TelemetrytypesSignalDTO,
+				},
+			};
+		case 'QUERY':
+		default:
+			return {
+				kind: QueryPluginKind['signoz/QueryVariable'],
+				spec: { queryValue: model.queryValue },
+			};
+	}
+}
+
+/** Flat form model → DTO envelope (for persistence). */
+export function formModelToDto(
+	model: VariableFormModel,
+): DashboardtypesVariableDTO {
+	const display = {
+		name: model.name,
+		description: model.description,
+		hidden: model.hidden,
+	};
+
+	if (model.type === 'TEXT') {
+		return {
+			kind: TextEnvelopeKind.TextVariable,
+			spec: {
+				name: model.name,
+				display,
+				value: model.textValue,
+				constant: model.textConstant,
+			},
+		};
+	}
+
+	return {
+		kind: ListEnvelopeKind.ListVariable,
+		spec: {
+			name: model.name,
+			display,
+			allowMultiple: model.multiSelect,
+			allowAllValue: model.showAllOption,
+			sort: model.sort,
+			defaultValue: model.defaultValue,
+			plugin: buildPlugin(model),
+		},
+	};
+}
+
+/** Maps the V2 plugin/envelope to the four UI-facing variable types. */
+export function variableTypeOf(
+	dto: DashboardtypesVariableDTO,
+): VariableFormModel['type'] {
+	return dtoToFormModel(dto).type;
+}
+
+export { PLUGIN_KIND };
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/variableModel.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/variableModel.ts
@@ -0,0 +1,78 @@
+import type { VariableDefaultValueDTO } from 'api/generated/services/sigNoz.schemas';
+
+/**
+ * Flat, UI-friendly representation of a V2 dashboard variable. The wire format
+ * (`DashboardtypesVariableDTO`) is a nested envelope/plugin union that is awkward
+ * to bind a form to; `variableAdapters` converts between this model and the DTO.
+ */
+
+export type VariableType = 'QUERY' | 'CUSTOM' | 'TEXT' | 'DYNAMIC';
+
+export type VariableSort = 'DISABLED' | 'ASC' | 'DESC';
+
+export type TelemetrySignal = 'traces' | 'logs' | 'metrics';
+
+/** Wire `kind` discriminators (string values of the generated enums). */
+export const ENVELOPE_KIND = {
+	LIST: 'ListVariable',
+	TEXT: 'TextVariable',
+} as const;
+
+export const PLUGIN_KIND = {
+	QUERY: 'signoz/QueryVariable',
+	CUSTOM: 'signoz/CustomVariable',
+	DYNAMIC: 'signoz/DynamicVariable',
+} as const;
+
+export const VARIABLE_SORTS: VariableSort[] = ['DISABLED', 'ASC', 'DESC'];
+
+export const TELEMETRY_SIGNALS: TelemetrySignal[] = [
+	'traces',
+	'logs',
+	'metrics',
+];
+
+export interface VariableFormModel {
+	/** Stable identifier, referenced in queries (e.g. `$name`); must be unique. */
+	name: string;
+	description: string;
+	hidden: boolean;
+	type: VariableType;
+
+	// List-variable common fields (Query / Custom / Dynamic).
+	multiSelect: boolean;
+	showAllOption: boolean;
+	sort: VariableSort;
+
+	// Type-specific.
+	queryValue: string; // QUERY
+	customValue: string; // CUSTOM
+	textValue: string; // TEXT
+	textConstant: boolean; // TEXT
+	dynamicAttribute: string; // DYNAMIC — the telemetry field name
+	dynamicSignal: TelemetrySignal; // DYNAMIC — the telemetry signal
+
+	/**
+	 * Runtime-selected default, not editable in the management tab yet; carried
+	 * through edits so saving a definition doesn't clobber it.
+	 */
+	defaultValue?: VariableDefaultValueDTO;
+}
+
+export function emptyVariableFormModel(): VariableFormModel {
+	return {
+		name: '',
+		description: '',
+		hidden: false,
+		type: 'QUERY',
+		multiSelect: false,
+		showAllOption: false,
+		sort: 'DISABLED',
+		queryValue: '',
+		customValue: '',
+		textValue: '',
+		textConstant: false,
+		dynamicAttribute: '',
+		dynamicSignal: 'traces',
+	};
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/variablePatchOps.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/Variables/variablePatchOps.ts
@@ -0,0 +1,22 @@
+import type {
+	DashboardtypesJSONPatchOperationDTO,
+	DashboardtypesVariableDTO,
+} from 'api/generated/services/sigNoz.schemas';
+
+/**
+ * Builds the JSON-Patch to persist the dashboard's variable list. Add/edit/
+ * delete/reorder all replace the whole `/spec/variables` array in one atomic op
+ * — simpler and race-free vs per-index patches. RFC-6902 `add` on an object
+ * member sets-or-replaces, so it works whether or not `variables` already exists.
+ */
+export function buildVariablesPatch(
+	variables: DashboardtypesVariableDTO[],
+): DashboardtypesJSONPatchOperationDTO[] {
+	return [
+		{
+			op: 'add' as DashboardtypesJSONPatchOperationDTO['op'],
+			path: '/spec/variables',
+			value: variables,
+		},
+	];
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/index.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/DashboardSettings/index.tsx
@@ -1,48 +1,39 @@
 import { useMemo } from 'react';

 import { Braces, Globe, Table } from '@signozhq/icons';
-import { Tabs } from '@signozhq/ui/tabs';
+import { TabItemProps, Tabs } from '@signozhq/ui/tabs';
 import type { DashboardtypesGettableDashboardV2DTO } from 'api/generated/services/sigNoz.schemas';

 import GeneralSettings from './General';
 import { SettingsTabPlaceholder } from './utils';
-
-import styles from './DashboardSettings.module.scss';
+import VariablesSettings from './Variables';

 interface DashboardSettingsProps {
 	dashboard: DashboardtypesGettableDashboardV2DTO;
 }

-function tabLabel(icon: JSX.Element, text: string): JSX.Element {
-	return (
-		<span className={styles.tabLabel}>
-			{icon}
-			{text}
-		</span>
-	);
-}
-
 function DashboardSettings({ dashboard }: DashboardSettingsProps): JSX.Element {
-	const items = useMemo(
+	const items: TabItemProps[] = useMemo(
 		() => [
 			{
 				key: 'general',
-				label: tabLabel(<Table size={14} />, 'General'),
+				label: 'General',
 				children: <GeneralSettings dashboard={dashboard} />,
+				prefixIcon: <Table size={14} />,
 			},
 			{
 				key: 'variables',
-				label: tabLabel(<Braces size={14} />, 'Variables'),
-				children: (
-					<SettingsTabPlaceholder message="V2 dashboard variables coming next." />
-				),
+				label: 'Variables',
+				children: <VariablesSettings dashboard={dashboard} />,
+				prefixIcon: <Braces size={14} />,
 			},
 			{
 				key: 'public-dashboard',
-				label: tabLabel(<Globe size={14} />, 'Publish'),
+				label: 'Publish',
 				children: (
 					<SettingsTabPlaceholder message="V2 public dashboard publishing coming next." />
 				),
+				prefixIcon: <Globe size={14} />,
 			},
 		],
 		[dashboard],
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/VariableSelector.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/VariableSelector.tsx
@@ -0,0 +1,93 @@
+import { useMemo } from 'react';
+import { Typography } from '@signozhq/ui/typography';
+import { commaValuesParser } from 'lib/dashboardVariables/customCommaValuesParser';
+import sortValues from 'lib/dashboardVariables/sortVariableValues';
+
+import type { VariableFormModel } from '../DashboardSettings/Variables/variableModel';
+import type { VariableSelection, VariableSelectionMap } from './selectionTypes';
+import DynamicSelector from './selectors/DynamicSelector';
+import QuerySelector from './selectors/QuerySelector';
+import TextSelector from './selectors/TextSelector';
+import ValueSelector from './selectors/ValueSelector';
+import styles from './VariablesBar.module.scss';
+
+interface VariableSelectorProps {
+	variable: VariableFormModel;
+	/** Names this variable depends on (for Query gating). */
+	parents: string[];
+	/** All current selections (Query passes them as the request payload). */
+	selections: VariableSelectionMap;
+	selection: VariableSelection;
+	onChange: (selection: VariableSelection) => void;
+}
+
+/** One labelled variable control; dispatches on the variable type. */
+function VariableSelector({
+	variable,
+	parents,
+	selections,
+	selection,
+	onChange,
+}: VariableSelectorProps): JSX.Element {
+	const customOptions = useMemo(
+		() =>
+			variable.type === 'CUSTOM'
+				? sortValues(commaValuesParser(variable.customValue), variable.sort).map(
+						String,
+					)
+				: [],
+		[variable],
+	);
+
+	const renderControl = (): JSX.Element => {
+		switch (variable.type) {
+			case 'TEXT':
+				return (
+					<TextSelector
+						selection={selection}
+						onChange={onChange}
+						testId={`variable-input-${variable.name}`}
+					/>
+				);
+			case 'QUERY':
+				return (
+					<QuerySelector
+						variable={variable}
+						parents={parents}
+						selections={selections}
+						selection={selection}
+						onChange={onChange}
+					/>
+				);
+			case 'DYNAMIC':
+				return (
+					<DynamicSelector
+						variable={variable}
+						selection={selection}
+						onChange={onChange}
+					/>
+				);
+			case 'CUSTOM':
+			default:
+				return (
+					<ValueSelector
+						options={customOptions}
+						multiSelect={variable.multiSelect}
+						showAllOption={variable.showAllOption}
+						selection={selection}
+						onChange={onChange}
+						testId={`variable-select-${variable.name}`}
+					/>
+				);
+		}
+	};
+
+	return (
+		<div className={styles.variable} data-testid={`variable-${variable.name}`}>
+			<Typography.Text className={styles.label}>${variable.name}</Typography.Text>
+			{renderControl()}
+		</div>
+	);
+}
+
+export default VariableSelector;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/VariablesBar.module.scss
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/VariablesBar.module.scss
@@ -0,0 +1,29 @@
+.bar {
+	display: flex;
+	flex-wrap: wrap;
+	align-items: flex-end;
+	gap: 12px 16px;
+	padding: 12px 16px;
+	border-bottom: 1px solid var(--l1-border);
+}
+
+.variable {
+	display: flex;
+	flex-direction: column;
+	gap: 4px;
+	min-width: 0;
+}
+
+.label {
+	font-size: 12px;
+	font-weight: 500;
+	color: var(--l2-foreground);
+}
+
+.select {
+	min-width: 160px;
+}
+
+.input {
+	min-width: 160px;
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/VariablesBar.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/VariablesBar.tsx
@@ -0,0 +1,44 @@
+import type { DashboardtypesGettableDashboardV2DTO } from 'api/generated/services/sigNoz.schemas';
+
+import { useVariableSelection } from './useVariableSelection';
+import VariableSelector from './VariableSelector';
+import styles from './VariablesBar.module.scss';
+
+interface VariablesBarProps {
+	dashboard: DashboardtypesGettableDashboardV2DTO;
+}
+
+/**
+ * Runtime variable selector bar shown above the panels. Renders one control per
+ * dashboard variable; selections live in the store + URL (never the spec).
+ */
+function VariablesBar({ dashboard }: VariablesBarProps): JSX.Element | null {
+	const { variables, dependencyData, selection, setSelection } =
+		useVariableSelection(dashboard);
+
+	if (variables.length === 0) {
+		return null;
+	}
+
+	return (
+		<div className={styles.bar} data-testid="dashboard-variables-bar">
+			{variables.map((variable) => (
+				<VariableSelector
+					key={variable.name}
+					variable={variable}
+					parents={dependencyData.parentGraph[variable.name] ?? []}
+					selections={selection}
+					selection={
+						selection[variable.name] ?? {
+							value: variable.multiSelect ? [] : '',
+							allSelected: false,
+						}
+					}
+					onChange={(next): void => setSelection(variable.name, next)}
+				/>
+			))}
+		</div>
+	);
+}
+
+export default VariablesBar;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectionTypes.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectionTypes.ts
@@ -0,0 +1,16 @@
+/** A user-selected variable value at runtime (not persisted to the spec). */
+export type SelectedVariableValue =
+	| string
+	| number
+	| boolean
+	| (string | number | boolean)[]
+	| null;
+
+export interface VariableSelection {
+	value: SelectedVariableValue;
+	/** True when every option is selected ("ALL"); for dynamic vars value may be null. */
+	allSelected: boolean;
+}
+
+/** Selected values for a dashboard's variables, keyed by variable name. */
+export type VariableSelectionMap = Record<string, VariableSelection>;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectionUtils.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectionUtils.ts
@@ -0,0 +1,31 @@
+import type {
+	SelectedVariableValue,
+	VariableSelection,
+	VariableSelectionMap,
+} from './selectionTypes';
+
+/** A selection counts as resolved (usable as a parent value) when it's non-empty. */
+export function isResolved(selection?: VariableSelection): boolean {
+	if (!selection) {
+		return false;
+	}
+	if (selection.allSelected) {
+		return true;
+	}
+	const { value } = selection;
+	if (Array.isArray(value)) {
+		return value.length > 0;
+	}
+	return value !== '' && value !== null && value !== undefined;
+}
+
+/** Flatten the selection map into the `{ name: value }` payload a query expects. */
+export function selectionToPayload(
+	selection: VariableSelectionMap,
+): Record<string, SelectedVariableValue> {
+	const payload: Record<string, SelectedVariableValue> = {};
+	Object.entries(selection).forEach(([name, sel]) => {
+		payload[name] = sel.value;
+	});
+	return payload;
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/DynamicSelector.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/DynamicSelector.tsx
@@ -0,0 +1,63 @@
+import { useMemo } from 'react';
+// eslint-disable-next-line no-restricted-imports
+import { useSelector } from 'react-redux';
+import { useGetFieldValues } from 'hooks/dynamicVariables/useGetFieldValues';
+import sortValues from 'lib/dashboardVariables/sortVariableValues';
+import type { AppState } from 'store/reducers';
+import type { GlobalReducer } from 'types/reducer/globalTime';
+
+import type { VariableFormModel } from '../../DashboardSettings/Variables/variableModel';
+import type { VariableSelection } from '../selectionTypes';
+import { useAutoSelect } from '../useAutoSelect';
+import ValueSelector from './ValueSelector';
+
+interface DynamicSelectorProps {
+	variable: VariableFormModel;
+	selection: VariableSelection;
+	onChange: (selection: VariableSelection) => void;
+}
+
+/**
+ * Dynamic-variable options sourced from live telemetry field values for the
+ * chosen signal + attribute. (Sibling-dynamic filtering is a later refinement.)
+ */
+function DynamicSelector({
+	variable,
+	selection,
+	onChange,
+}: DynamicSelectorProps): JSX.Element {
+	const { minTime, maxTime } = useSelector<AppState, GlobalReducer>(
+		(state) => state.globalTime,
+	);
+
+	const { data, isFetching } = useGetFieldValues({
+		signal: variable.dynamicSignal,
+		name: variable.dynamicAttribute,
+		startUnixMilli: minTime,
+		endUnixMilli: maxTime,
+		enabled: !!variable.dynamicAttribute,
+	});
+
+	const options = useMemo(() => {
+		const payload = data?.data;
+		const values =
+			payload?.normalizedValues ?? payload?.values?.StringValues ?? [];
+		return sortValues(values, variable.sort).map(String);
+	}, [data, variable.sort]);
+
+	useAutoSelect(variable, options, selection, onChange);
+
+	return (
+		<ValueSelector
+			options={options}
+			multiSelect={variable.multiSelect}
+			showAllOption={variable.showAllOption}
+			loading={isFetching}
+			selection={selection}
+			onChange={onChange}
+			testId={`variable-select-${variable.name}`}
+		/>
+	);
+}
+
+export default DynamicSelector;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/QuerySelector.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/QuerySelector.tsx
@@ -0,0 +1,89 @@
+import { useMemo } from 'react';
+import { useQuery } from 'react-query';
+// eslint-disable-next-line no-restricted-imports
+import { useSelector } from 'react-redux';
+import dashboardVariablesQuery from 'api/dashboard/variables/dashboardVariablesQuery';
+import sortValues from 'lib/dashboardVariables/sortVariableValues';
+import type { AppState } from 'store/reducers';
+import type { GlobalReducer } from 'types/reducer/globalTime';
+
+import type { VariableFormModel } from '../../DashboardSettings/Variables/variableModel';
+import type {
+	VariableSelection,
+	VariableSelectionMap,
+} from '../selectionTypes';
+import { isResolved, selectionToPayload } from '../selectionUtils';
+import { useAutoSelect } from '../useAutoSelect';
+import ValueSelector from './ValueSelector';
+
+interface QuerySelectorProps {
+	variable: VariableFormModel;
+	/** Names this variable's query references; it waits until they're resolved. */
+	parents: string[];
+	/** All current selections, fed to the query as `{ name: value }`. */
+	selections: VariableSelectionMap;
+	selection: VariableSelection;
+	onChange: (selection: VariableSelection) => void;
+}
+
+/**
+ * Query-driven options. Dependency orchestration is declarative: the query is
+ * `enabled` only once every parent is resolved, and the parent values are in the
+ * query key — so it refetches automatically when a parent changes (and a cyclic
+ * dependency is simply never enabled).
+ */
+function QuerySelector({
+	variable,
+	parents,
+	selections,
+	selection,
+	onChange,
+}: QuerySelectorProps): JSX.Element {
+	const { minTime, maxTime } = useSelector<AppState, GlobalReducer>(
+		(state) => state.globalTime,
+	);
+	const payload = useMemo(() => selectionToPayload(selections), [selections]);
+	const enabled = parents.every((parent) => isResolved(selections[parent]));
+
+	const { data, isFetching } = useQuery(
+		[
+			'dashboard-variable',
+			variable.name,
+			variable.queryValue,
+			payload,
+			minTime,
+			maxTime,
+		],
+		() =>
+			dashboardVariablesQuery({
+				query: variable.queryValue,
+				variables: payload,
+			}),
+		{ enabled, refetchOnWindowFocus: false },
+	);
+
+	const options = useMemo(() => {
+		if (!data || data.statusCode !== 200 || !data.payload) {
+			return [] as string[];
+		}
+		return sortValues(data.payload.variableValues ?? [], variable.sort).map(
+			String,
+		);
+	}, [data, variable.sort]);
+
+	useAutoSelect(variable, options, selection, onChange);
+
+	return (
+		<ValueSelector
+			options={options}
+			multiSelect={variable.multiSelect}
+			showAllOption={variable.showAllOption}
+			loading={isFetching}
+			selection={selection}
+			onChange={onChange}
+			testId={`variable-select-${variable.name}`}
+		/>
+	);
+}
+
+export default QuerySelector;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/TextSelector.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/TextSelector.tsx
@@ -0,0 +1,31 @@
+import { Input } from '@signozhq/ui/input';
+
+import type { VariableSelection } from '../selectionTypes';
+import styles from '../VariablesBar.module.scss';
+
+interface TextSelectorProps {
+	selection: VariableSelection;
+	onChange: (selection: VariableSelection) => void;
+	testId?: string;
+}
+
+/** Free-text variable input. */
+function TextSelector({
+	selection,
+	onChange,
+	testId,
+}: TextSelectorProps): JSX.Element {
+	return (
+		<Input
+			className={styles.input}
+			value={typeof selection.value === 'string' ? selection.value : ''}
+			placeholder="Enter a value"
+			onChange={(e): void =>
+				onChange({ value: e.target.value, allSelected: false })
+			}
+			testId={testId}
+		/>
+	);
+}
+
+export default TextSelector;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/ValueSelector.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/selectors/ValueSelector.tsx
@@ -0,0 +1,68 @@
+import { SelectSimple } from '@signozhq/ui/select';
+
+import type { VariableSelection } from '../selectionTypes';
+import { ALL_SELECTED } from '../useVariableSelection';
+import styles from '../VariablesBar.module.scss';
+
+interface ValueSelectorProps {
+	options: string[];
+	multiSelect: boolean;
+	showAllOption: boolean;
+	loading?: boolean;
+	selection: VariableSelection;
+	onChange: (selection: VariableSelection) => void;
+	testId?: string;
+}
+
+/** Single/multi value picker for Custom/Query/Dynamic variables (options injected). */
+function ValueSelector({
+	options,
+	multiSelect,
+	showAllOption,
+	loading,
+	selection,
+	onChange,
+	testId,
+}: ValueSelectorProps): JSX.Element {
+	const items = [
+		...(showAllOption && multiSelect
+			? [{ label: 'ALL', value: ALL_SELECTED }]
+			: []),
+		...options.map((option) => ({ label: option, value: option })),
+	];
+
+	let value: string | string[];
+	if (selection.allSelected) {
+		value = multiSelect ? [ALL_SELECTED] : '';
+	} else if (multiSelect) {
+		value = (Array.isArray(selection.value) ? selection.value : []).map(String);
+	} else {
+		value = selection.value == null ? '' : String(selection.value);
+	}
+
+	const handleChange = (next: string | string[]): void => {
+		const picksAll =
+			next === ALL_SELECTED ||
+			(Array.isArray(next) && next.includes(ALL_SELECTED));
+		if (showAllOption && multiSelect && picksAll) {
+			onChange({ value: options, allSelected: true });
+			return;
+		}
+		onChange({ value: next, allSelected: false });
+	};
+
+	return (
+		<SelectSimple
+			className={styles.select}
+			items={items}
+			value={value}
+			multiple={multiSelect}
+			loading={loading}
+			placeholder="Select"
+			onChange={handleChange}
+			testId={testId}
+		/>
+	);
+}
+
+export default ValueSelector;
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/useAutoSelect.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/useAutoSelect.ts
@@ -0,0 +1,41 @@
+import { useEffect } from 'react';
+
+import type { VariableFormModel } from '../DashboardSettings/Variables/variableModel';
+import type { VariableSelection } from './selectionTypes';
+
+/**
+ * When fetched options arrive and the current selection isn't one of them,
+ * auto-pick the variable's default (if present in the options) or the first
+ * option — so dependent children always have a usable parent value.
+ */
+export function useAutoSelect(
+	variable: VariableFormModel,
+	options: string[],
+	selection: VariableSelection,
+	onChange: (selection: VariableSelection) => void,
+): void {
+	useEffect(() => {
+		if (options.length === 0 || selection.allSelected) {
+			return;
+		}
+		const current = selection.value;
+		const isValid = Array.isArray(current)
+			? current.length > 0 && current.every((c) => options.includes(String(c)))
+			: current !== '' &&
+				current !== null &&
+				current !== undefined &&
+				options.includes(String(current));
+		if (isValid) {
+			return;
+		}
+		const fallback = (variable.defaultValue as { value?: string } | undefined)
+			?.value;
+		const initial =
+			fallback && options.includes(fallback) ? fallback : options[0];
+		onChange({
+			value: variable.multiSelect ? [initial] : initial,
+			allSelected: false,
+		});
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [options]);
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/useVariableSelection.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/useVariableSelection.ts
@@ -0,0 +1,116 @@
+import { useCallback, useEffect, useMemo } from 'react';
+import { parseAsJson, useQueryState } from 'nuqs';
+import type { DashboardtypesGettableDashboardV2DTO } from 'api/generated/services/sigNoz.schemas';
+
+import { dtoToFormModel } from '../DashboardSettings/Variables/variableAdapters';
+import type { VariableFormModel } from '../DashboardSettings/Variables/variableModel';
+import { selectVariableValues } from '../store/slices/variableSelectionSlice';
+import { useDashboardStore } from '../store/useDashboardStore';
+import type {
+	SelectedVariableValue,
+	VariableSelection,
+	VariableSelectionMap,
+} from './selectionTypes';
+import {
+	computeVariableDependencies,
+	type VariableDependencyData,
+} from './variableDependencies';
+
+/** URL sentinel for an "ALL values selected" state (matches V1). */
+export const ALL_SELECTED = '__ALL__';
+
+/** `?variables=` holds `{ [name]: value }` (ALL encoded as the sentinel). */
+const variablesUrlParser = parseAsJson<Record<string, SelectedVariableValue>>(
+	(v) =>
+		typeof v === 'object' && v !== null
+			? (v as Record<string, SelectedVariableValue>)
+			: null,
+);
+
+function defaultSelection(model: VariableFormModel): VariableSelection {
+	const def = (
+		model.defaultValue as { value?: SelectedVariableValue } | undefined
+	)?.value;
+	if (def !== undefined && def !== null && def !== '') {
+		return { value: def, allSelected: false };
+	}
+	return { value: model.multiSelect ? [] : '', allSelected: false };
+}
+
+function fromUrlValue(raw: SelectedVariableValue): VariableSelection {
+	return raw === ALL_SELECTED
+		? { value: null, allSelected: true }
+		: { value: raw, allSelected: false };
+}
+
+interface UseVariableSelection {
+	variables: VariableFormModel[];
+	dependencyData: VariableDependencyData;
+	selection: VariableSelectionMap;
+	setSelection: (name: string, selection: VariableSelection) => void;
+}
+
+/**
+ * Runtime variable selection: derives the variable list from the spec, seeds
+ * each value from URL → localStorage(store) → default, and persists changes to
+ * both the store and the URL. Never writes to the dashboard spec.
+ */
+export function useVariableSelection(
+	dashboard: DashboardtypesGettableDashboardV2DTO,
+): UseVariableSelection {
+	const dashboardId = dashboard.id ?? '';
+
+	const variables = useMemo(
+		() => (dashboard.spec?.variables ?? []).map(dtoToFormModel),
+		[dashboard.spec?.variables],
+	);
+	const dependencyData = useMemo(
+		() => computeVariableDependencies(variables),
+		[variables],
+	);
+
+	const selection = useDashboardStore(selectVariableValues(dashboardId));
+	const setVariableValue = useDashboardStore((s) => s.setVariableValue);
+	const setVariableValues = useDashboardStore((s) => s.setVariableValues);
+
+	const [urlValues, setUrlValues] = useQueryState(
+		'variables',
+		variablesUrlParser.withOptions({ history: 'replace' }),
+	);
+
+	// Seed selections for this dashboard: URL wins, then persisted store, then default.
+	useEffect(() => {
+		if (!dashboardId || variables.length === 0) {
+			return;
+		}
+		// `selection` here is the persisted (localStorage) map on mount — the
+		// effect deliberately doesn't depend on it, so seeding runs once per set.
+		const stored = selection;
+		const seeded: VariableSelectionMap = {};
+		variables.forEach((variable) => {
+			const urlValue = urlValues?.[variable.name];
+			if (urlValue !== undefined) {
+				seeded[variable.name] = fromUrlValue(urlValue);
+			} else if (stored[variable.name]) {
+				seeded[variable.name] = stored[variable.name];
+			} else {
+				seeded[variable.name] = defaultSelection(variable);
+			}
+		});
+		setVariableValues(dashboardId, seeded);
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [dashboardId, variables]);
+
+	const setSelection = useCallback(
+		(name: string, next: VariableSelection): void => {
+			setVariableValue(dashboardId, name, next);
+			void setUrlValues((prev) => ({
+				...(prev ?? {}),
+				[name]: next.allSelected ? ALL_SELECTED : next.value,
+			}));
+		},
+		[dashboardId, setVariableValue, setUrlValues],
+	);
+
+	return { variables, dependencyData, selection, setSelection };
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/variableDependencies.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/VariablesBar/variableDependencies.ts
@@ -0,0 +1,199 @@
+import { textContainsVariableReference } from 'lib/dashboardVariables/variableReference';
+
+import type { VariableFormModel } from '../DashboardSettings/Variables/variableModel';
+
+/**
+ * Inter-variable dependency graph for runtime selection. A QUERY variable
+ * "depends on" another variable when its query text references that variable
+ * (`{{.name}}`, `{{name}}`, `$name`, `[[name]]`). When a variable's value
+ * changes, its dependent QUERY variables must refetch. Ported from the V1
+ * dashboard-variables runtime; operates on the V2 flat variable model.
+ */
+
+export type VariableGraph = Record<string, string[]>;
+
+export interface VariableDependencyData {
+	/** Topological order of variables (parents before children). */
+	order: string[];
+	/** Direct children (dependents) of each variable. */
+	graph: VariableGraph;
+	/** Direct parents of each variable. */
+	parentGraph: VariableGraph;
+	/** All transitive descendants of each variable (precomputed). */
+	transitiveDescendants: VariableGraph;
+	hasCycle: boolean;
+	cycleNodes?: string[];
+}
+
+/** Names of QUERY variables whose query references `variableName`. */
+function getDependents(
+	variableName: string,
+	variables: VariableFormModel[],
+): string[] {
+	return variables
+		.filter(
+			(v) =>
+				v.type === 'QUERY' &&
+				!!v.name &&
+				textContainsVariableReference(v.queryValue || '', variableName),
+		)
+		.map((v) => v.name);
+}
+
+/** variable name → its direct dependents (children). */
+export function buildDependencies(
+	variables: VariableFormModel[],
+): VariableGraph {
+	const graph: VariableGraph = {};
+	variables.forEach((v) => {
+		if (v.name) {
+			graph[v.name] = getDependents(v.name, variables);
+		}
+	});
+	return graph;
+}
+
+/** Invert a child graph into a parent graph. */
+export function buildParentGraph(graph: VariableGraph): VariableGraph {
+	const parents: VariableGraph = {};
+	Object.keys(graph).forEach((node) => {
+		parents[node] = parents[node] ?? [];
+	});
+	Object.entries(graph).forEach(([node, children]) => {
+		children.forEach((child) => {
+			parents[child] = parents[child] ?? [];
+			parents[child].push(node);
+		});
+	});
+	return parents;
+}
+
+function collectCyclePath(
+	graph: VariableGraph,
+	start: string,
+	end: string,
+): string[] {
+	const path: string[] = [];
+	let current = start;
+	const findParent = (node: string): string | undefined =>
+		Object.keys(graph).find((key) => graph[key]?.includes(node));
+	while (current !== end) {
+		const parent = findParent(current);
+		if (!parent) {
+			break;
+		}
+		path.push(parent);
+		current = parent;
+	}
+	return [start, ...path];
+}
+
+function detectCycle(
+	graph: VariableGraph,
+	node: string,
+	visited: Set<string>,
+	recStack: Set<string>,
+): string[] | null {
+	if (!visited.has(node)) {
+		visited.add(node);
+		recStack.add(node);
+		let cycleNodes: string[] | null = null;
+		(graph[node] || []).some((neighbor) => {
+			if (!visited.has(neighbor)) {
+				const found = detectCycle(graph, neighbor, visited, recStack);
+				if (found) {
+					cycleNodes = found;
+					return true;
+				}
+			} else if (recStack.has(neighbor)) {
+				cycleNodes = collectCyclePath(graph, node, neighbor);
+				return true;
+			}
+			return false;
+		});
+		if (cycleNodes) {
+			return cycleNodes;
+		}
+	}
+	recStack.delete(node);
+	return null;
+}
+
+/** Build the full dependency data (topo order, parents, transitive descendants, cycle info). */
+export function buildDependencyData(
+	dependencies: VariableGraph,
+): VariableDependencyData {
+	const inDegree: Record<string, number> = {};
+	const adjList: VariableGraph = {};
+
+	Object.keys(dependencies).forEach((node) => {
+		inDegree[node] = inDegree[node] ?? 0;
+		adjList[node] = adjList[node] ?? [];
+		(dependencies[node] || []).forEach((child) => {
+			inDegree[child] = inDegree[child] ?? 0;
+			inDegree[child] += 1;
+			adjList[node].push(child);
+		});
+	});
+
+	const visited = new Set<string>();
+	const recStack = new Set<string>();
+	let cycleNodes: string[] | undefined;
+	Object.keys(dependencies).some((node) => {
+		if (!visited.has(node)) {
+			const found = detectCycle(dependencies, node, visited, recStack);
+			if (found) {
+				cycleNodes = found;
+				return true;
+			}
+		}
+		return false;
+	});
+
+	// Topological sort (Kahn's algorithm).
+	const queue = Object.keys(inDegree).filter((n) => inDegree[n] === 0);
+	const order: string[] = [];
+	while (queue.length > 0) {
+		const current = queue.shift();
+		if (current === undefined) {
+			break;
+		}
+		order.push(current);
+		(adjList[current] || []).forEach((neighbor) => {
+			inDegree[neighbor] -= 1;
+			if (inDegree[neighbor] === 0) {
+				queue.push(neighbor);
+			}
+		});
+	}
+
+	const hasCycle = order.length !== Object.keys(dependencies).length;
+
+	// Transitive descendants: walk topo order in reverse.
+	const transitiveDescendants: VariableGraph = {};
+	for (let i = order.length - 1; i >= 0; i--) {
+		const node = order[i];
+		const desc = new Set<string>();
+		(adjList[node] || []).forEach((child) => {
+			desc.add(child);
+			(transitiveDescendants[child] || []).forEach((d) => desc.add(d));
+		});
+		transitiveDescendants[node] = Array.from(desc);
+	}
+
+	return {
+		order,
+		graph: adjList,
+		parentGraph: buildParentGraph(adjList),
+		transitiveDescendants,
+		hasCycle,
+		cycleNodes,
+	};
+}
+
+/** Compute the full dependency data straight from the variable list. */
+export function computeVariableDependencies(
+	variables: VariableFormModel[],
+): VariableDependencyData {
+	return buildDependencyData(buildDependencies(variables));
+}
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/index.tsx
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/index.tsx
@@ -9,6 +9,7 @@ import { useAppContext } from 'providers/App/App';
 import DashboardDescription from './DashboardDescription';
 import PanelsAndSectionsLayout from './PanelsAndSectionsLayout';
 import { useDashboardStore } from './store/useDashboardStore';
+import VariablesBar from './VariablesBar/VariablesBar';
 import styles from './DashboardContainer.module.scss';

 interface DashboardContainerProps {
@@ -45,6 +46,7 @@ function DashboardContainer({
 					handle={fullScreenHandle}
 					refetch={refetch}
 				/>
+				<VariablesBar dashboard={dashboard} />
 				<PanelsAndSectionsLayout layouts={layouts} panels={panels} />
 			</div>
 			{/* Shared panel-type picker (V1 component): opened from any "New Panel"
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/store/slices/variableSelectionSlice.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/store/slices/variableSelectionSlice.ts
@@ -0,0 +1,58 @@
+import type { StateCreator } from 'zustand';
+
+import type {
+	VariableSelection,
+	VariableSelectionMap,
+} from '../../VariablesBar/selectionTypes';
+import type { DashboardStore } from '../useDashboardStore';
+
+/**
+ * Runtime variable selection — the values the user picks in the variable bar.
+ * Keyed by dashboardId → variable name. Frontend-only and persisted to
+ * localStorage (mirrored to the URL by the bar for shareable links); it is
+ * deliberately NOT part of the dashboard spec, so selecting a value never
+ * patches the dashboard.
+ */
+export interface VariableSelectionSlice {
+	variableValues: Record<string, VariableSelectionMap>;
+	setVariableValue: (
+		dashboardId: string,
+		name: string,
+		selection: VariableSelection,
+	) => void;
+	/** Bulk set (used to seed from URL/localStorage/defaults on load). */
+	setVariableValues: (
+		dashboardId: string,
+		values: VariableSelectionMap,
+	) => void;
+}
+
+export const createVariableSelectionSlice: StateCreator<
+	DashboardStore,
+	[['zustand/persist', unknown]],
+	[],
+	VariableSelectionSlice
+> = (set, get) => ({
+	variableValues: {},
+	setVariableValue: (dashboardId, name, selection): void => {
+		const { variableValues } = get();
+		set({
+			variableValues: {
+				...variableValues,
+				[dashboardId]: { ...variableValues[dashboardId], [name]: selection },
+			},
+		});
+	},
+	setVariableValues: (dashboardId, values): void => {
+		const { variableValues } = get();
+		set({
+			variableValues: { ...variableValues, [dashboardId]: values },
+		});
+	},
+});
+
+/** Selector: the selection map for a dashboard (empty if none). */
+export const selectVariableValues =
+	(dashboardId: string) =>
+	(state: DashboardStore): VariableSelectionMap =>
+		state.variableValues[dashboardId] ?? {};
--- a/frontend/src/pages/DashboardPageV2/DashboardContainer/store/useDashboardStore.ts
+++ b/frontend/src/pages/DashboardPageV2/DashboardContainer/store/useDashboardStore.ts
@@ -9,25 +9,36 @@ import {
 	createCollapseSlice,
 	type CollapseSlice,
 } from './slices/collapseSlice';
+import {
+	createVariableSelectionSlice,
+	type VariableSelectionSlice,
+} from './slices/variableSelectionSlice';

-export type DashboardStore = EditContextSlice & CollapseSlice;
+export type DashboardStore = EditContextSlice &
+	CollapseSlice &
+	VariableSelectionSlice;

 /**
 * V2 dashboard session store. Holds cross-cutting client state only — never the
- * dashboard spec (that stays in react-query via useGetDashboardV2). Two slices:
+ * dashboard spec (that stays in react-query via useGetDashboardV2). Slices:
 * - edit-context: dashboardId / isEditable / refetch (set once, not persisted).
 * - collapse: per-section open state (frontend-only, persisted to localStorage).
+ * - variable-selection: runtime variable values (frontend-only, persisted).
 */
 export const useDashboardStore = create<DashboardStore>()(
 	persist(
 		(...a) => ({
 			...createEditContextSlice(...a),
 			...createCollapseSlice(...a),
+			...createVariableSelectionSlice(...a),
 		}),
 		{
 			name: '@signoz/dashboard-v2',
-			// Persist only the collapse map — context (incl. the refetch fn) is transient.
-			partialize: (state) => ({ collapsed: state.collapsed }),
+			// Persist UI-only state (context incl. the refetch fn is transient).
+			partialize: (state) => ({
+				collapsed: state.collapsed,
+				variableValues: state.variableValues,
+			}),
 		},
 	),
 );
Author	SHA1	Message	Date
Ashwin Bhatkal	736a2a751e	feat(dashboard-v2): query & dynamic selectors with dependency orchestration Query variables fetch options via /variables/query (passing the other variables' values); Dynamic variables fetch live telemetry field values. Dependencies are orchestrated declaratively: a Query selector is enabled only once its parents resolve and its query key carries the parent values, so it refetches when a parent changes and a cyclic dependency is simply never enabled. Options auto-select the default/first value so dependent children always have input.	2026-06-11 11:52:00 +05:30
Ashwin Bhatkal	d01e8aff22	feat(dashboard-v2): variable selector bar with static selectors Render a runtime variable bar above the panels (one control per spec variable), seeding each value from URL -> localStorage(store) -> default and persisting changes to the store + URL (?variables=). Custom (static options) and Text selectors are wired; Query/Dynamic render the picker shell (option-fetching and dependency orchestration follow).	2026-06-11 10:54:27 +05:30
Ashwin Bhatkal	6ae1033752	feat(dashboard-v2): variable-selection foundation — dependency graph & store Pure runtime-selection groundwork (no UI yet): inter-variable dependency graph (detect query references, topo order, cycle detection, transitive descendants) ported to the V2 model; selection value types; and a persisted zustand variableValues slice (frontend-only — selecting a value never patches the spec).	2026-06-11 10:31:31 +05:30
Ashwin Bhatkal	0587fe41e4	feat(dashboard-v2): variables settings tab — list, CRUD & persistence Wire the Variables tab into the settings drawer (replacing the placeholder): list variables, add/edit in place, delete via inline confirm, reorder, each persisted with a single /spec/variables patch -> toast -> refetch.	2026-06-11 09:54:25 +05:30
Ashwin Bhatkal	75f5a8b82c	feat(dashboard-v2): variable editor form for all variable types In-drawer master-detail editor reproducing the V1 VariableItem layout with @signozhq components: segmented type selector, per-type bodies (Custom comma values, Text default + constant, Query editor + test-run preview, Dynamic signal + field autocomplete) and the shared preview / sort / multi-select / ALL / default-value rows.	2026-06-11 09:54:25 +05:30
Ashwin Bhatkal	2f541df60e	feat(dashboard-v2): variable model, adapters & patch builder Flat VariableFormModel + adapters between the nested envelope/plugin DTO union (ListVariable{Query,Custom,Dynamic} / TextVariable) and the model, plus a JSON-patch builder that replaces /spec/variables atomically. Pure, no UI.	2026-06-11 09:54:25 +05:30