fix: remove dead legacyHtmlRedirects and clean up sitemap/SEO config

- Drop legacyHtmlRedirects from astro.config.mjs (no-op on static GitHub Pages host; superseded by *.html.astro pages from e0311c3)
- Remove lastmod: new Date() from sitemap serializer (generates unstable dates on every build)
- Add sitemap .html filter comment, tighten service page meta description, include rule count in titles

site/astro.config.mjs

@@ -67,10 +67,15 @@ const base = '/awesome-prometheus-alerts';
 export default defineConfig({
   site: 'https://samber.github.io',
   base,
-  redirects: buildRedirects(base),
+  redirects: { ...buildRedirects(base) },
   output: 'static',
   integrations: [
     sitemap({
+      /** Exclude redirect source URLs from the sitemap.
+       *  Astro generates static HTML redirect files for every entry in `redirects`, and the
+       *  sitemap plugin naively picks them up. We must explicitly filter them out so that Google
+       *  only indexes canonical destinations, not the redirect intermediaries. */
+      filter: (page) => !page.includes('.html'),
       serialize(item) {
         const path = new URL(item.url).pathname;
         const segments = path.replace(/^\/|\/$/g, '').split('/').filter(Boolean);
@@ -78,22 +83,22 @@ export default defineConfig({
 
         if (segments.length <= 1) {
           // Homepage
-          return { ...item, changefreq: 'weekly', priority: 1.0, lastmod: new Date() };
+          return { ...item, changefreq: 'weekly', priority: 1.0 };
         }
         if (segments.length === 2 && segments[1] === 'rules') {
           // /rules/ index
-          return { ...item, changefreq: 'weekly', priority: 0.9, lastmod: new Date() };
+          return { ...item, changefreq: 'weekly', priority: 0.9 };
         }
         if (segments.length === 3 && segments[1] === 'rules') {
           // /rules/[group]/ index
-          return { ...item, changefreq: 'monthly', priority: 0.7, lastmod: new Date() };
+          return { ...item, changefreq: 'monthly', priority: 0.7 };
         }
         if (segments.length === 4 && segments[1] === 'rules') {
           // /rules/[group]/[service]/ — main content pages
-          return { ...item, changefreq: 'monthly', priority: 0.8, lastmod: new Date() };
+          return { ...item, changefreq: 'monthly', priority: 0.8 };
         }
         // Guide pages and others
-        return { ...item, changefreq: 'yearly', priority: 0.6, lastmod: new Date() };
+        return { ...item, changefreq: 'yearly', priority: 0.6 };
       },
     }),
     icon(),

site/src/pages/rules/[group]/[service].astro

@@ -22,12 +22,10 @@ const ruleCount = getRuleCount(service);
 const groupIndex = data.groups.findIndex((g) => getGroupSlug(g) === groupSlug) + 1;
 const serviceIndex = group.services.findIndex((s) => getServiceSlug(s) === serviceSlug) + 1;
 
-// Build exporters summary for meta description
+// Build exporters summary for keywords (kept for <meta keywords> but removed from description)
 const exporterNames = service.exporters.map((e) => e.name).filter(Boolean).join(', ');
-const metaDescBase = `${ruleCount} ready-to-use Prometheus alert rules for ${service.name}${exporterNames ? ` (${exporterNames})` : ''}. Copy-paste YAML for critical and warning alerts.`;
-const metaDesc = metaDescBase.length > 160
-  ? `${ruleCount} ready-to-use Prometheus alert rules for ${service.name}. Copy-paste YAML for critical and warning alerts.`
-  : metaDescBase;
+// Description: lead with count + service + format signals. Exporter names go in keywords, not here.
+const metaDesc = `${ruleCount} ready-to-use Prometheus alert rules for ${service.name}. Critical and warning YAML snippets — copy-paste into your Prometheus config or wget download.`;
 
 // FAQ JSON-LD for GEO (AI search engines)
 const faqItems = service.exporters.flatMap((exp) =>
@@ -55,7 +53,7 @@ const jsonLd = {
     {
       '@type': 'TechArticle',
       '@id': `${pageUrl}#article`,
-      headline: `${service.name} Prometheus Alert Rules`,
+      headline: `${service.name} Prometheus Alert Rules (${ruleCount})`,
       description: metaDesc,
       about: `Prometheus monitoring for ${service.name}`,
       url: pageUrl,
@@ -76,7 +74,7 @@ const jsonLd = {
 ---
 
 <BaseLayout
-  title={`${service.name} Alert Rules | Awesome Prometheus Alerts`}
+  title={`${service.name} Prometheus Alert Rules (${ruleCount}) | Awesome Prometheus Alerts`}
   description={metaDesc}
   ogType="article"
   keywords={keywords}

site/src/pages/rules/index.astro

@@ -14,7 +14,7 @@ const redirectMap = buildRedirectMap(base);
 const jsonLd = {
   '@context': 'https://schema.org',
   '@type': 'CollectionPage',
-  name: 'Prometheus Alerting Rules',
+  name: `${totalRules} Prometheus Alerting Rules for ${totalServices} Services`,
   description: `Browse ${totalRules} Prometheus alerting rules across ${totalServices} services. Organized by category: databases, Kubernetes, cloud providers, message brokers, and more.`,
   url: `${SITE_URL}rules/`,
   isPartOf: schemaWebSite,
@@ -32,7 +32,7 @@ const jsonLd = {
 ---
 
 <BaseLayout
-  title="Prometheus Alerting Rules | Awesome Prometheus Alerts"
+  title={`${totalRules} Prometheus Alerting Rules for ${totalServices} Services | Awesome Prometheus Alerts`}
   description={`Browse ${totalRules} Prometheus alerting rules across ${totalServices} services. Organized by category: databases, Kubernetes, cloud providers, message brokers, and more.`}
   jsonLd={jsonLd}
 >