diff --git a/app/docs/[...slug]/page.tsx b/app/docs/[...slug]/page.tsx
index d5b92c07022..57b701a91bb 100644
--- a/app/docs/[...slug]/page.tsx
+++ b/app/docs/[...slug]/page.tsx
@@ -7,8 +7,10 @@ import StateGrowthChart from "@/components/content-design/state-growth-chart";
 import { BackToTop } from "@/components/ui/back-to-top";
 import { Feedback } from "@/components/ui/feedback";
 import { SidebarActions } from "@/components/ui/sidebar-actions";
+import { ApiDeprecationNotice } from "@/components/api/api-deprecation-notice";
 import { CChainAPIPage, DataAPIPage, MetricsAPIPage, PChainAPIPage, VerificationAPIPage, XChainAPIPage } from "@/components/api/api-pages";
 import AddNetworkButtonInline from "@/components/client/AddNetworkButtonInline";
+import { getApiDeprecation } from "@/lib/api-deprecations";
 import { documentation } from "@/lib/source";
 import { createMetadata } from "@/utils/metadata";
 import { sharedMDXComponents } from "@/components/mdx/shared-components";
@@ -45,6 +47,7 @@ export default async function Page(props: {
   if (!page) notFound();
 
   const { body: MDX, toc } = await page.data.load();
+  const apiDeprecation = getApiDeprecation(page.slugs);
   // Use page.path which contains the actual file path relative to collection root
   // (e.g., "tooling/avalanche-sdk/index.mdx" for an index file)
   // This correctly handles both regular .mdx files and index.mdx files
@@ -84,6 +87,7 @@ export default async function Page(props: {
         <DocsDescription>{page.data.description}</DocsDescription>
       )}
       <DocsBody className="text-fd-foreground/80">
+        {apiDeprecation && <ApiDeprecationNotice deprecation={apiDeprecation} />}
         <MDX
           components={{
             ...(() => {
diff --git a/components/api/api-deprecation-notice.tsx b/components/api/api-deprecation-notice.tsx
new file mode 100644
index 00000000000..8d3b79dd4a1
--- /dev/null
+++ b/components/api/api-deprecation-notice.tsx
@@ -0,0 +1,25 @@
+import { DocsCallout } from '@/components/docs-book/callout';
+import { formatDeprecationDate, type ApiDeprecation } from '@/lib/api-deprecations';
+
+export function ApiDeprecationNotice({ deprecation }: { deprecation: ApiDeprecation }) {
+  const { name, deprecatedAt, sunsetAt, decommissionedAt } = deprecation;
+  return (
+    <DocsCallout type="warn" title="Deprecated" art={false}>
+      <p>
+        The {name} is deprecated and will be sunset on {formatDeprecationDate(sunsetAt)}. Plan to migrate off it
+        before then.
+      </p>
+      <ul>
+        <li>
+          <strong>Deprecated:</strong> {formatDeprecationDate(deprecatedAt)}
+        </li>
+        <li>
+          <strong>Sunset:</strong> {formatDeprecationDate(sunsetAt)}
+        </li>
+        <li>
+          <strong>Decommissioned:</strong> {formatDeprecationDate(decommissionedAt)}
+        </li>
+      </ul>
+    </DocsCallout>
+  );
+}
diff --git a/components/navigation/docs-nav-config.tsx b/components/navigation/docs-nav-config.tsx
index 8620f1bc018..c37718d80f2 100644
--- a/components/navigation/docs-nav-config.tsx
+++ b/components/navigation/docs-nav-config.tsx
@@ -96,7 +96,8 @@ export const apiReferenceOptions: NavOption[] = [
   },
   {
     title: 'Metrics API',
-    description: 'Network metrics and statistics',
+    badge: 'Deprecated',
+    description: 'Deprecated: network metrics and statistics',
     icon: <Activity className="w-5 h-5" />,
     url: '/docs/api-reference/metrics-api',
   },
diff --git a/content/docs/api-reference/metrics-api/meta.json b/content/docs/api-reference/metrics-api/meta.json
index 093e32a409b..76d13d6f2f6 100644
--- a/content/docs/api-reference/metrics-api/meta.json
+++ b/content/docs/api-reference/metrics-api/meta.json
@@ -1,6 +1,6 @@
 {
   "title": "Metrics API",
-  "description": "Popsicle Metrics API for Avalanche network metrics",
+  "description": "Deprecated: Popsicle Metrics API for Avalanche network metrics",
   "icon": "ChartLine",
   "root": true,
   "pages": [
diff --git a/lib/api-deprecations.ts b/lib/api-deprecations.ts
new file mode 100644
index 00000000000..4fe9dedb3af
--- /dev/null
+++ b/lib/api-deprecations.ts
@@ -0,0 +1,33 @@
+export interface ApiDeprecation {
+  name: string;
+  /** Docs slugs under /docs that this deprecation covers, e.g. ['api-reference', 'metrics-api']. */
+  slugPrefix: string[];
+  /** ISO 8601 timestamps in UTC. */
+  deprecatedAt: string;
+  sunsetAt: string;
+  decommissionedAt: string;
+}
+
+export const API_DEPRECATIONS: ApiDeprecation[] = [
+  {
+    name: 'Metrics API',
+    slugPrefix: ['api-reference', 'metrics-api'],
+    deprecatedAt: '2026-11-05T00:00:00Z',
+    sunsetAt: '2026-11-16T12:00:00Z',
+    decommissionedAt: '2026-11-30T12:00:00Z',
+  },
+];
+
+export function getApiDeprecation(slugs: string[]): ApiDeprecation | undefined {
+  return API_DEPRECATIONS.find(({ slugPrefix }) => slugPrefix.every((part, i) => slugs[i] === part));
+}
+
+const dateFormat = new Intl.DateTimeFormat('en-US', { dateStyle: 'long', timeZone: 'UTC' });
+const timeFormat = new Intl.DateTimeFormat('en-US', { hour: '2-digit', minute: '2-digit', hourCycle: 'h23', timeZone: 'UTC' });
+
+/** "November 16, 2026", or "November 16, 2026 12:00 UTC" when the time is not midnight. */
+export function formatDeprecationDate(iso: string): string {
+  const date = new Date(iso);
+  const day = dateFormat.format(date);
+  return date.getUTCHours() === 0 && date.getUTCMinutes() === 0 ? day : `${day} ${timeFormat.format(date)} UTC`;
+}
diff --git a/tests/e2e/ai/visual.ts b/tests/e2e/ai/visual.ts
index b08d65d77a2..59d6b8d7de5 100644
--- a/tests/e2e/ai/visual.ts
+++ b/tests/e2e/ai/visual.ts
@@ -24,7 +24,7 @@ export function layoutIsIntact(subject: string, normal: readonly string[] = []):
 }
 
 // Waits until the screen the judge sees has settled. First the page is at the top, the web fonts have loaded and
-// the images in view have decoded. A timeout names the image (a broken image in view never loads).
+// the image requests in view have finished. A timeout names an image whose request is still pending.
 export async function waitForStillScreen(browser: Browser): Promise<void> {
   await expect
     .poll(
@@ -39,7 +39,7 @@ export async function waitForStillScreen(browser: Browser): Promise<void> {
               const inHeight = box.bottom > 0 && box.top < window.innerHeight;
               return box.width > 0 && inHeight && box.right > 0 && box.left < window.innerWidth;
             })
-            .filter((image) => !(image.complete && image.naturalWidth > 0))
+            .filter((image) => !image.complete)
             .map((image) => image.currentSrc || image.src);
           return loading.length > 0 ? `images not loaded: ${loading.slice(0, 3).join(', ')}` : 'loaded';
         }),
diff --git a/tests/unit/docs/api-deprecations.test.ts b/tests/unit/docs/api-deprecations.test.ts
new file mode 100644
index 00000000000..f9b38998849
--- /dev/null
+++ b/tests/unit/docs/api-deprecations.test.ts
@@ -0,0 +1,25 @@
+import { describe, expect, it } from 'vitest';
+import { formatDeprecationDate, getApiDeprecation } from '@/lib/api-deprecations';
+
+describe('getApiDeprecation', () => {
+  it('covers every page of the Metrics API reference', () => {
+    expect(getApiDeprecation(['api-reference', 'metrics-api'])?.name).toBe('Metrics API');
+    expect(getApiDeprecation(['api-reference', 'metrics-api', 'evm-chains', 'getEvmChainMetrics'])?.name).toBe(
+      'Metrics API',
+    );
+  });
+
+  it('leaves other pages alone', () => {
+    expect(getApiDeprecation(['api-reference', 'data-api'])).toBeUndefined();
+    expect(getApiDeprecation(['api-reference', 'webhook-api', 'webhooks', 'createWebhook'])).toBeUndefined();
+    expect(getApiDeprecation(['api-reference'])).toBeUndefined();
+    expect(getApiDeprecation(['rpcs', 'other', 'metrics-api'])).toBeUndefined();
+  });
+});
+
+describe('formatDeprecationDate', () => {
+  it('shows the UTC time unless it is midnight', () => {
+    expect(formatDeprecationDate('2026-11-05T00:00:00Z')).toBe('November 5, 2026');
+    expect(formatDeprecationDate('2026-11-16T12:00:00Z')).toBe('November 16, 2026 12:00 UTC');
+  });
+});