Recreate IA (Information Architecture), map URLs, 301 redirect old -> new, move schema/meta, and validate with server logs + Search Console.
Use regex filters in analytics and monitor impression/ranking segments in Search Console.
Search Console, analytics (e.g., GA4 (Google Analytics 4)), rank tracking, crawl diagnostics, and call tracking.
Check technical changes, indexing, competitor moves, or broad updates; triage with logs and GSC.
