Mistake: indexable pages missing from the sitemap entirely

Mistake: indexable pages missing from the sitemap entirely

The loud failures are bad URLs in the file. The silent one is good URLs left out — new templates, a section behind a feature flag, paginated archives. Google can still find them via links, but you lose the freshness and coverage signal.

Fix checklist:
— ✅ Every indexable, canonical 200-page is present in some sitemap
— Reconcile sitemap URL count against a fresh crawl/DB count of indexable pages — they should match within 2%
— ✅ New page templates are wired into the generator before launch, not after
— Watch for whole sections excluded by an over-broad generator filter

Definition of done: diff the set of indexable URLs (from crawl) against the set in your sitemaps. The "in crawl, not in sitemap" list must be empty or every entry explained (intentionally excluded).