Core Web Vitals monitoring
Core Web Vitals monitoring continuously tracks LCP, INP, and CLS metrics on key site pages, distinguishing synthetic measurement (Lighthouse CI in lab) from real-world field data (CrUX, RUM), in order to detect regressions before they affect rankings.
In practice
Google uses CrUX field data (Chrome User Experience Report) — not Lighthouse scores — for its Page Experience ranking signals. An effective monitoring pipeline combines: Lighthouse CI at each deployment (early detection), Search Console alerts on Core Web Vitals metric drops, and RUM (Real User Monitoring) via web-vitals.js segmented by device type and connection. A mobile LCP regression detected within an hour prevents several days of traffic loss.