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.

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;

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;

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;
+}

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;

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;

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);
+}

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;

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;

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 };
+}

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 };

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',
+	};
+}

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,
+		},
+	];
+}

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],