fix(uplotV2): tooltip list clips last row and over-scrolls (#11883)

The Virtuoso scroller height was set to min(totalListHeight, 300), but the
scroll viewport adds 8px top + 8px bottom padding that totalListHeight does
not account for. The box was therefore ~16px shorter than its content,
clipping the last row and showing a scrollbar even when every row would fit.

Add the viewport's vertical padding back into the computed height so it only
scrolls once content genuinely exceeds the max height.

frontend/src/container/AIAssistant/__tests__/getAutoContexts.test.ts

@@ -48,6 +48,48 @@ describe('getAutoContexts', () => {
 		]);
 	});
 
+	it('includes the query in alert edit context', () => {
+		const ruleId = 'rule-edit';
+		const query = { queryType: 'builder', builder: { queryData: [] } };
+		const compositeQuery = encodeURIComponent(JSON.stringify(query));
+		const search = `?${QueryParams.ruleId}=${ruleId}&${QueryParams.compositeQuery}=${compositeQuery}`;
+
+		const contexts = getAutoContexts(ROUTES.EDIT_ALERTS, search);
+
+		expect(contexts).toStrictEqual([
+			{
+				source: 'auto',
+				type: 'alert',
+				resourceId: ruleId,
+				metadata: {
+					page: 'alert_edit',
+					ruleId,
+					query,
+				},
+			},
+		]);
+	});
+
+	it('includes the query in alert new context (no ruleId)', () => {
+		const query = { queryType: 'builder', builder: { queryData: [] } };
+		const compositeQuery = encodeURIComponent(JSON.stringify(query));
+		const search = `?${QueryParams.compositeQuery}=${compositeQuery}`;
+
+		const contexts = getAutoContexts(ROUTES.ALERTS_NEW, search);
+
+		expect(contexts).toStrictEqual([
+			{
+				source: 'auto',
+				type: 'alert',
+				resourceId: null,
+				metadata: {
+					page: 'alert_new',
+					query,
+				},
+			},
+		]);
+	});
+
 	it('returns triggered alerts context on alert history without ruleId', () => {
 		const contexts = getAutoContexts(ROUTES.ALERT_HISTORY, '');
 

frontend/src/container/AIAssistant/getAutoContexts.ts

@@ -124,7 +124,9 @@ export function getAutoContexts(
 		}
 	}
 
-	// Alert edit — `/alerts/edit?ruleId=…`.
+	// Alert edit — `/alerts/edit?ruleId=…`. The form syncs its query-builder
+	// state to the URL (`useShareBuilderUrl`), so shared metadata carries the
+	// alert's query + time range, mirroring the dashboard panel editor.
 	if (matchPath(pathname, { path: ROUTES.EDIT_ALERTS, exact: true })) {
 		const ruleId = params.get(QueryParams.ruleId);
 		if (ruleId) {
@@ -133,19 +135,21 @@ export function getAutoContexts(
 					source: 'auto',
 					type: 'alert',
 					resourceId: ruleId,
-					metadata: { page: 'alert_edit', ruleId },
+					metadata: { page: 'alert_edit', ruleId, ...sharedMetadata },
 				},
 			];
 		}
 	}
 
+	// Alert new — `/alerts/new`. No rule id yet (draft), but the query-builder
+	// state is on the URL, so shared metadata carries the in-progress query.
 	if (matchPath(pathname, { path: ROUTES.ALERTS_NEW, exact: true })) {
 		return [
 			{
 				source: 'auto',
 				type: 'alert',
 				resourceId: null,
-				metadata: { page: 'alert_new' },
+				metadata: { page: 'alert_new', ...sharedMetadata },
 			},
 		];
 	}

frontend/src/container/LLMObservability/Settings/ModelPricing/LLMObservabilityModelPricing.module.scss

@@ -13,6 +13,9 @@
 }
 
 .pageHeaderTitle {
+	display: flex;
+	flex-direction: column;
+	gap: var(--spacing-2);
 	.title {
 		margin: 0;
 		font-size: var(--font-size-xl);

frontend/src/container/LLMObservability/Settings/ModelPricing/LLMObservabilityModelPricing.tsx

@@ -1,3 +1,7 @@
+import { Tabs } from '@signozhq/ui/tabs';
+import { Typography } from '@signozhq/ui/typography';
+
+import ModelCostTabPanel from './ModelCostTabPanel';
 import styles from './LLMObservabilityModelPricing.module.scss';
 
 function LLMObservabilityModelPricing(): JSX.Element {
@@ -8,12 +12,34 @@ function LLMObservabilityModelPricing(): JSX.Element {
 		>
 			<header className={styles.pageHeader}>
 				<div className={styles.pageHeaderTitle}>
-					<h1 className={styles.title}>Configuration</h1>
-					<p className={styles.subtitle}>
+					<Typography.Text as="h1" size="large" weight="semibold">
+						Configuration
+					</Typography.Text>
+					<Typography.Text color="muted">
 						Model pricing and cost estimation settings
-					</p>
+					</Typography.Text>
 				</div>
 			</header>
+
+			<Tabs
+				// Model costs is the only enabled tab for now, so default to it. When
+				// the unpriced-models tab lands, this can become a URL-backed param.
+				defaultValue="model-costs"
+				items={[
+					{
+						key: 'model-costs',
+						label: 'Model costs',
+						children: <ModelCostTabPanel />,
+					},
+					{
+						// Unpriced-models tab lands in a later PR.
+						key: 'unpriced-models',
+						label: 'Unpriced models',
+						disabled: true,
+						children: null,
+					},
+				]}
+			/>
 		</div>
 	);
 }

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/ModelCostTabPanel.module.scss

@@ -0,0 +1,7 @@
+.pageError {
+	padding: var(--spacing-6) var(--spacing-8);
+	border-radius: var(--radius-2);
+	background: color-mix(in srgb, var(--bg-cherry-400) 8%, transparent);
+	color: var(--text-cherry-400);
+	font-size: var(--periscope-font-size-base);
+}

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/ModelCostTabPanel.tsx

@@ -0,0 +1,61 @@
+import { useMemo } from 'react';
+import { useListLLMPricingRules } from 'api/generated/services/llmpricingrules';
+import { type ListLLMPricingRulesParams } from 'api/generated/services/sigNoz.schemas';
+import { useTableParams } from 'components/TanStackTableView';
+import { Typography } from '@signozhq/ui/typography';
+
+import { LIMIT_KEY, PAGE_KEY, PAGE_SIZE } from '../constants';
+import styles from './ModelCostTabPanel.module.scss';
+import ModelCostsTable from './components/ModelCostsTable';
+import { type LlmpricingruletypesLLMPricingRuleDTO } from 'api/generated/services/sigNoz.schemas';
+
+function ModelCostTabPanel(): JSX.Element {
+	const { page, limit } = useTableParams(
+		{ page: PAGE_KEY, limit: LIMIT_KEY },
+		{ page: 1, limit: PAGE_SIZE },
+	);
+
+	// Search + source filters are intentionally omitted for now — the list API
+	// doesn't honour them yet. They'll be reintroduced here once it does.
+	const listParams: ListLLMPricingRulesParams = {
+		offset: (page - 1) * limit,
+		limit,
+	};
+
+	const { data, isLoading, isError } = useListLLMPricingRules(listParams);
+
+	const rules: LlmpricingruletypesLLMPricingRuleDTO[] = useMemo(
+		() => data?.data?.items || [],
+		[data],
+	);
+	const total = data?.data?.total ?? 0;
+
+	return (
+		<>
+			{isError && (
+				<div className={styles.pageError} role="alert">
+					Failed to load pricing rules. Please try again.
+				</div>
+			)}
+
+			{/* Read-only listing. Edit/Add wiring + the drawer land in the next PR. */}
+			<ModelCostsTable
+				rules={rules}
+				isLoading={isLoading}
+				total={total}
+				selectedRuleId={null}
+				canManage={false}
+				onEdit={(): void => undefined}
+				onDelete={(): void => undefined}
+			/>
+
+			<footer>
+				<Typography.Text color="muted" size="small">
+					All prices per 1M tokens (USD)
+				</Typography.Text>
+			</footer>
+		</>
+	);
+}
+
+export default ModelCostTabPanel;

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/ModelCostActionsMenu.module.scss

@@ -0,0 +1,8 @@
+.actionButton {
+	opacity: 0.7;
+	transition: opacity 0.15s ease;
+
+	&:hover {
+		opacity: 1;
+	}
+}

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/ModelCostActionsMenu.tsx

@@ -0,0 +1,61 @@
+import { useMemo } from 'react';
+import { Ellipsis } from '@signozhq/icons';
+import { Button } from '@signozhq/ui/button';
+import { DropdownMenuSimple, type MenuItem } from '@signozhq/ui/dropdown-menu';
+import { type LlmpricingruletypesLLMPricingRuleDTO } from 'api/generated/services/sigNoz.schemas';
+
+import styles from './ModelCostActionsMenu.module.scss';
+
+interface ModelCostActionsMenuProps {
+	rule: LlmpricingruletypesLLMPricingRuleDTO;
+	canManage: boolean;
+	onEdit: (rule: LlmpricingruletypesLLMPricingRuleDTO) => void;
+	onDelete: (rule: LlmpricingruletypesLLMPricingRuleDTO) => void;
+}
+
+// Per-row kebab menu for the model-costs table. Only manage users get actions
+// (Edit + Delete); view-only users have nothing to act on, so the cell stays
+// empty rather than showing a single-item menu.
+function ModelCostActionsMenu({
+	rule,
+	canManage,
+	onEdit,
+	onDelete,
+}: ModelCostActionsMenuProps): JSX.Element | null {
+	const menuItems = useMemo<MenuItem[]>(
+		() => [
+			{
+				key: 'edit',
+				label: 'Edit',
+				onClick: (): void => onEdit(rule),
+			},
+			{
+				key: 'delete',
+				label: 'Delete',
+				danger: true,
+				onClick: (): void => onDelete(rule),
+			},
+		],
+		[onEdit, onDelete, rule],
+	);
+
+	if (!canManage) {
+		return null;
+	}
+
+	return (
+		<DropdownMenuSimple menu={{ items: menuItems }} align="end">
+			<Button
+				variant="ghost"
+				color="secondary"
+				size="icon"
+				className={styles.actionButton}
+				testId={`model-cost-actions-${rule.id}`}
+			>
+				<Ellipsis size={16} />
+			</Button>
+		</DropdownMenuSimple>
+	);
+}
+
+export default ModelCostActionsMenu;

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/ModelCostsTable.module.scss

@@ -0,0 +1,20 @@
+.modelCostsTable {
+	margin-top: var(--spacing-8);
+	--tanstack-table-row-height: 48px;
+	height: calc(100vh - 250px);
+	overflow-y: auto;
+
+	:global(table) tbody tr {
+		cursor: default;
+	}
+}
+
+.modelCostsEmpty {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	margin-top: var(--spacing-8);
+	min-height: 400px;
+	color: var(--text-vanilla-400);
+	font-size: var(--periscope-font-size-base);
+}

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/ModelCostsTable.tsx

@@ -0,0 +1,73 @@
+import { useMemo } from 'react';
+import TanStackTable from 'components/TanStackTableView';
+
+import {
+	LIMIT_KEY,
+	PAGE_KEY,
+	PAGE_SIZE,
+	SKELETON_ROW_COUNT,
+} from '../../../constants';
+import styles from './ModelCostsTable.module.scss';
+import { getModelCostsColumns } from './TableConfig';
+import { type LlmpricingruletypesLLMPricingRuleDTO } from 'api/generated/services/sigNoz.schemas';
+
+interface ModelCostsTableProps {
+	rules: LlmpricingruletypesLLMPricingRuleDTO[];
+	isLoading: boolean;
+	total: number;
+	selectedRuleId: string | null;
+	canManage: boolean;
+	onEdit: (rule: LlmpricingruletypesLLMPricingRuleDTO) => void;
+	onDelete: (rule: LlmpricingruletypesLLMPricingRuleDTO) => void;
+}
+
+// The table owns its own pagination URL state (page/limit) via enableQueryParams;
+// ModelCostsTab reads the same keys to build the list request. Virtual scroll is
+// disabled: a plain table renders fine at our page sizes (up to 100 rows) and the
+// fixed-height scroll viewport (.modelCostsTable) keeps large pages scrolling
+// inside the table.
+function ModelCostsTable({
+	rules,
+	isLoading,
+	total,
+	selectedRuleId,
+	canManage,
+	onEdit,
+	onDelete,
+}: ModelCostsTableProps): JSX.Element {
+	const columns = useMemo(
+		() => getModelCostsColumns({ canManage, onEdit, onDelete }),
+		[canManage, onEdit, onDelete],
+	);
+
+	if (!isLoading && rules.length === 0) {
+		return (
+			<div className={styles.modelCostsEmpty} data-testid="model-costs-empty">
+				No model costs yet.
+			</div>
+		);
+	}
+
+	return (
+		<TanStackTable<LlmpricingruletypesLLMPricingRuleDTO>
+			className={styles.modelCostsTable}
+			data={rules}
+			columns={columns}
+			isLoading={isLoading}
+			skeletonRowCount={SKELETON_ROW_COUNT}
+			getRowKey={(row): string => row.id}
+			isRowActive={(row): boolean => row.id === selectedRuleId}
+			disableVirtualScroll
+			testId="model-costs-table"
+			enableQueryParams={{ page: PAGE_KEY, limit: LIMIT_KEY }}
+			pagination={{
+				total,
+				defaultLimit: PAGE_SIZE,
+				showTotalCount: true,
+				totalCountLabel: 'models',
+			}}
+		/>
+	);
+}
+
+export default ModelCostsTable;

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/TableConfig/index.ts

@@ -0,0 +1 @@
+export { getModelCostsColumns } from './table.config';

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/TableConfig/table.config.tsx

@@ -0,0 +1,161 @@
+import { Badge } from '@signozhq/ui/badge';
+import { Typography } from '@signozhq/ui/typography';
+import type { TableColumnDef } from 'components/TanStackTableView';
+import { startCase } from 'lodash-es';
+
+import styles from './tableConfig.module.scss';
+import ModelCostActionsMenu from '../ModelCostActionsMenu';
+import { type LlmpricingruletypesLLMPricingRuleDTO } from 'api/generated/services/sigNoz.schemas';
+
+import {
+	formatPricePerMillion,
+	getCanonicalId,
+	getExtraBuckets,
+	getRelativeLastSeen,
+	getSourceLabel,
+} from '../../../../utils';
+
+interface ColumnsConfig {
+	canManage: boolean;
+	onEdit: (rule: LlmpricingruletypesLLMPricingRuleDTO) => void;
+	onDelete: (rule: LlmpricingruletypesLLMPricingRuleDTO) => void;
+}
+
+// Column definitions for the model-costs TanStackTable. Sorting is intentionally
+// off across the board — the list API only accepts offset/limit, so there's no
+// server-side ordering to back a sortable header yet.
+export function getModelCostsColumns({
+	canManage,
+	onEdit,
+	onDelete,
+}: ColumnsConfig): TableColumnDef<LlmpricingruletypesLLMPricingRuleDTO>[] {
+	return [
+		{
+			id: 'model',
+			header: 'Model',
+			accessorFn: (row): string => row.modelName ?? '',
+			// Flexes to absorb spare width alongside Extra buckets so the row fills
+			// the container instead of leaving a gap on the right.
+			width: { min: 240, default: '100%' },
+			enableMove: false,
+			enableRemove: false,
+			cell: ({ row }): JSX.Element => (
+				<div className={styles.modelCell}>
+					<Typography.Text
+						weight="semibold"
+						truncate={1}
+						testId={`model-cell-name-${row.id}`}
+					>
+						{row.modelName}
+					</Typography.Text>
+
+					<Typography.Text truncate={1}>{getCanonicalId(row)}</Typography.Text>
+				</div>
+			),
+		},
+		{
+			id: 'provider',
+			header: 'Provider',
+			accessorKey: 'provider',
+			width: { min: 140 },
+			enableMove: false,
+			cell: ({ row }): string => row.provider ?? '',
+		},
+		{
+			id: 'input',
+			header: 'Input / 1M',
+			width: { min: 120 },
+			enableMove: false,
+			cell: ({ row }): JSX.Element => (
+				<Typography.Text>
+					{formatPricePerMillion(row.pricing?.input)}
+				</Typography.Text>
+			),
+		},
+		{
+			id: 'output',
+			header: 'Output / 1M',
+			width: { min: 120 },
+			enableMove: false,
+			cell: ({ row }): JSX.Element => (
+				<Typography.Text>
+					{formatPricePerMillion(row.pricing?.output)}
+				</Typography.Text>
+			),
+		},
+		{
+			id: 'extraBuckets',
+			header: 'Extra buckets',
+			width: { min: 200, default: '100%' },
+			enableMove: false,
+			cell: ({ row }): JSX.Element => {
+				const buckets = getExtraBuckets(row);
+				if (buckets.length === 0) {
+					return (
+						<Typography.Text color="muted" as="span">
+							—
+						</Typography.Text>
+					);
+				}
+				return (
+					<div className={styles.extraBuckets}>
+						{buckets.map((bucket) => (
+							<Badge
+								key={bucket.key}
+								color="vanilla"
+								variant="outline"
+								className={styles.extraBucketsChip}
+							>
+								<Typography.Text as="span" size="small">
+									{startCase(bucket.key)}
+								</Typography.Text>
+								<Typography.Text as="span" size="small" weight="semibold">
+									{formatPricePerMillion(bucket.pricePerMillion)}
+								</Typography.Text>
+							</Badge>
+						))}
+					</div>
+				);
+			},
+		},
+		{
+			id: 'source',
+			header: 'Source',
+			width: { min: 130 },
+			enableMove: false,
+			cell: ({ row }): JSX.Element => (
+				<Badge
+					color={row.isOverride ? 'amber' : 'robin'}
+					variant="outline"
+					className={styles.sourceBadge}
+					data-testid={`source-badge-${row.id}`}
+				>
+					{getSourceLabel(row)}
+				</Badge>
+			),
+		},
+		{
+			id: 'lastSeen',
+			header: 'Last seen',
+			width: { min: 120 },
+			enableMove: false,
+			cell: ({ row }): string => getRelativeLastSeen(row),
+		},
+		{
+			id: 'actions',
+			header: '',
+			width: { fixed: '56px', ignoreLastColumnFill: true },
+			pin: 'right',
+			enableMove: false,
+			enableRemove: false,
+			cell: ({ row }): JSX.Element | null => (
+				<ModelCostActionsMenu
+					rule={row}
+					canManage={canManage}
+					onEdit={onEdit}
+					onDelete={onDelete}
+				/>
+			),
+		},
+	];
+}

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/TableConfig/tableConfig.module.scss

@@ -0,0 +1,26 @@
+.modelCell {
+	display: flex;
+	flex-direction: column;
+	gap: var(--spacing-1);
+	min-width: 0;
+}
+
+.extraBuckets {
+	display: flex;
+	// Keep chips on a single line so the row stays at the table's fixed row
+	// height; the column flexes to 100% so there's room for both.
+	flex-wrap: nowrap;
+	gap: var(--spacing-3);
+	overflow: hidden;
+}
+
+.extraBucketsChip {
+	display: inline-flex;
+	align-items: center;
+	gap: var(--spacing-3);
+	margin: 0;
+}
+
+.sourceBadge {
+	margin: 0;
+}

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/components/ModelCostsTable/index.ts

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

frontend/src/container/LLMObservability/Settings/ModelPricing/ModelCostTabPanel/index.ts

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

frontend/src/container/LLMObservability/Settings/ModelPricing/constants.ts

@@ -0,0 +1,6 @@
+export const PAGE_SIZE = 20;
+
+export const PAGE_KEY = 'page';
+export const LIMIT_KEY = 'limit';
+
+export const SKELETON_ROW_COUNT = PAGE_SIZE;

frontend/src/container/LLMObservability/Settings/ModelPricing/types.ts

@@ -0,0 +1,4 @@
+export interface ExtraBucket {
+	key: string;
+	pricePerMillion: number;
+}

frontend/src/container/LLMObservability/Settings/ModelPricing/utils.ts

@@ -0,0 +1,60 @@
+import dayjs from 'dayjs';
+import relativeTime from 'dayjs/plugin/relativeTime';
+
+import type { ExtraBucket } from './types';
+import type { LlmpricingruletypesLLMPricingRuleDTO } from 'api/generated/services/sigNoz.schemas';
+
+dayjs.extend(relativeTime);
+
+const getRelativeTime = (
+	timestamp: string | number | Date | null | undefined,
+): string => {
+	const parsed = timestamp != null ? dayjs(timestamp) : null;
+	return parsed?.isValid() ? parsed.fromNow() : '—';
+};
+
+// ─── Display helpers ─────────────────────────────────────────────────────────
+
+export const formatPricePerMillion = (value: number | undefined): string => {
+	if (value === undefined || value === null) {
+		return '—';
+	}
+	// 2dp is enough for per-1M pricing. we can update this later we models have sub-cent pricing.
+	return `$${value.toFixed(2)}`;
+};
+
+export const getExtraBuckets = (
+	rule: LlmpricingruletypesLLMPricingRuleDTO,
+): ExtraBucket[] => {
+	const cache = rule.pricing?.cache;
+	if (!cache) {
+		return [];
+	}
+	const buckets: ExtraBucket[] = [];
+	if (typeof cache.read === 'number' && cache.read > 0) {
+		buckets.push({ key: 'cache_read', pricePerMillion: cache.read });
+	}
+	if (typeof cache.write === 'number' && cache.write > 0) {
+		buckets.push({ key: 'cache_write', pricePerMillion: cache.write });
+	}
+	return buckets;
+};
+
+export const getSourceLabel = (
+	rule: LlmpricingruletypesLLMPricingRuleDTO,
+): 'Auto' | 'User override' => (rule.isOverride ? 'User override' : 'Auto');
+
+export const getRelativeLastSeen = (
+	rule: LlmpricingruletypesLLMPricingRuleDTO,
+): string => getRelativeTime(rule.updatedAt || rule.syncedAt || rule.createdAt);
+
+// Canonical id shown under the model name, e.g. "openai:gpt-4o". Both segments
+// are lower-cased so the id is consistently normalised (providers/models can
+// arrive with mixed casing).
+export const getCanonicalId = (
+	rule: LlmpricingruletypesLLMPricingRuleDTO,
+): string => {
+	const provider = rule.provider?.trim().toLowerCase() || 'unknown';
+	const model = rule.modelName?.trim().toLowerCase() || 'unknown';
+	return `${provider}:${model}`;
+};

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

@@ -177,7 +177,8 @@ describe('Tooltip', () => {
 		renderTooltip({ uPlotInstance, content });
 
 		const list = screen.getByTestId('uplot-tooltip-list');
-		expect(list).toHaveStyle({ height: '200px' });
+		// Measured height (200) + the scroll viewport's vertical padding (16)
+		expect(list).toHaveStyle({ height: '216px' });
 	});
 
 	it('sets tooltip list height based on content length when Virtuoso reports 0 height', () => {
@@ -188,8 +189,8 @@ describe('Tooltip', () => {
 		renderTooltip({ uPlotInstance, content });
 
 		const list = screen.getByTestId('uplot-tooltip-list');
-		// Falls back to content length: 2 items * 38px = 76px
-		expect(list).toHaveStyle({ height: '76px' });
+		// Falls back to content length (2 * 38 = 76) + vertical padding (16) = 92px
+		expect(list).toHaveStyle({ height: '92px' });
 	});
 });
 

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

@@ -13,6 +13,11 @@ import Styles from './TooltipList.module.scss';
 // Fallback per-item height before Virtuoso reports the real total.
 const TOOLTIP_ITEM_HEIGHT = 38;
 const LIST_MAX_HEIGHT = 300;
+// Vertical padding (spacing-4 top + bottom) the SCSS applies to the scroll
+// viewport. Virtuoso's reported height covers only the items, so it must be
+// added back — otherwise the box is short by this amount, clipping the last
+// row and showing a scrollbar even when every row would fit.
+const LIST_VERTICAL_PADDING = 16;
 
 interface TooltipListProps {
 	id: string;
@@ -30,13 +35,13 @@ export default function TooltipList({
 	// Use the measured height from Virtuoso when available; fall back to a
 	// per-item estimate on first render. Math.ceil prevents a 1 px
 	// subpixel rounding gap from triggering a spurious scrollbar.
-	const height = useMemo(
-		() =>
-			totalListHeight > 0
-				? Math.ceil(Math.min(totalListHeight, LIST_MAX_HEIGHT))
-				: Math.min(content.length * TOOLTIP_ITEM_HEIGHT, LIST_MAX_HEIGHT),
-		[totalListHeight, content.length],
-	);
+	const height = useMemo(() => {
+		const contentHeight =
+			totalListHeight > 0 ? totalListHeight : content.length * TOOLTIP_ITEM_HEIGHT;
+		return Math.ceil(
+			Math.min(contentHeight + LIST_VERTICAL_PADDING, LIST_MAX_HEIGHT),
+		);
+	}, [totalListHeight, content.length]);
 
 	const handleScroll = useCallback(() => {
 		if (!isScrollEventTriggered.current) {

pkg/http/render/render.go

@@ -130,6 +130,7 @@ func Error(rw http.ResponseWriter, cause error) {
 		rw.Header().Set("Retry-After", strconv.Itoa(int(math.Ceil(d.Seconds()))))
 	}
 
+	rw.Header().Set("Content-Type", "application/json")
 	rw.WriteHeader(httpCode)
 	_, _ = rw.Write(body)
 }