Google: Support for the Web Vitals extension has ended   developer.chrome.com

The merger of the Web Vitals extension and DevTools is complete and support for the extension has ended.

"For anyone else still using the Web Vitals extension, you should migrate to DevTools now. You'll start to see warnings in the extension about the end of support, urging you to migrate. We also plan to revoke its CrUX API key in the near future, which will break the field data integration".