Added: [DI-27819] - Add Notice banner for upcoming maintenance activity in longview

packages/manager/.changeset/pr-13080-added-1762923818606.md

@@ -0,0 +1,5 @@
+---
+"@linode/manager": Added
+---
+
+A notice banner to inform the customers about the upcoming maintenance activity in longview and to download and use the new GPG key ([#13080](https://github.com/linode/manager/pull/13080))

packages/manager/src/routes/longview/LongviewRoute.tsx

@@ -1,13 +1,34 @@
+import { Typography } from '@linode/ui';
 import { Outlet } from '@tanstack/react-router';
 import React from 'react';
 
+import { DismissibleBanner } from 'src/components/DismissibleBanner/DismissibleBanner';
 import { DocumentTitleSegment } from 'src/components/DocumentTitle';
+import { Link } from 'src/components/Link';
 import { ProductInformationBanner } from 'src/components/ProductInformationBanner/ProductInformationBanner';
 import { SuspenseLoader } from 'src/components/SuspenseLoader';
 
 export const LongviewRoute = () => {
   return (
     <React.Suspense fallback={<SuspenseLoader />}>
+      <DismissibleBanner
+        dismissible={false}
+        preferenceKey="longview-gpg-key-update"
+        spacingBottom={8}
+        title="Update required: Longview GPG key"
+        variant="warning"
+      >
+        <Typography fontSize="inherit">
+          <b>Update required: Longview GPG key</b> <br />
+          The current Longview GPG key used for APT package verification will be
+          revoked on January 5, 2026. To ensure uninterrupted package
+          installations and updates for Longview, please update your system to
+          trust the new key by following the instructions{' '}
+          <Link to="https://techdocs.akamai.com/cloud-computing/docs/troubleshooting-linode-longview#longview-gpg-apt-signing-key-update">
+            here.
+          </Link>
+        </Typography>
+      </DismissibleBanner>
       <DocumentTitleSegment segment="Longview" />
       <ProductInformationBanner bannerLocation="Longview" />
       <Outlet />