From 04e6cca9f8ba412cd0221138eb7465cc49a8453f Mon Sep 17 00:00:00 2001
From: Christopher Tauchen <chris.tauchen@tigera.io>
Date: Fri, 17 Jul 2026 13:00:48 +0100
Subject: [PATCH] SEO: Emit <lastmod> in sitemap
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The generated sitemap.xml had no <lastmod> timestamps (only changefreq and
priority), so search engines had no signal that a page's content changed. This
hurts pages whose body is fully replaced each release under a stable URL — most
notably /calico/latest/release-notes/ — leaving stale snapshots in the index.

Enable the sitemap plugin's `lastmod: 'date'` option (supported since Docusaurus
3.4; project is on 3.10) so each URL gets a <lastmod> date derived from git.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 docusaurus.config.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docusaurus.config.js b/docusaurus.config.js
index 18b90e6221..70b8b014a3 100644
--- a/docusaurus.config.js
+++ b/docusaurus.config.js
@@ -87,6 +87,7 @@ export default async function createAsyncConfig() {
             sidebarPath: false,
           },
           sitemap: {
+            lastmod: 'date',
             ignorePatterns: ['/calico/[0-9]*.[0-9]*/**', '/calico-enterprise/[0-9]*.[0-9]*/**'],
           },
           googleTagManager: {