Google began to send out email notifications about the new INP, Interaction to Next, core web vitals report recently. I believe Google started to send them out shortly after the report went live in Search Console.
As a reminder, INP, Interaction to Next, is replacing FID, First Input Delay, in March 2024.
Will shared a screenshot on Twitter of the email he received from Google Search Console about the issues one of his properties has with INP. The email says:
Core Web Vitals INP issues detected on your sites
Google is transitioning to a new metric to measure the responsiveness of sites, called Interaction to Next Paint (INP), which will replace FID as a Core Web Vital in March
2024.
Search Console has detected that your sites have INP issues in the following properties.
Click a property in the following list to open the INP report for that property (max. 10 properties shown):
Then I suspect it lists some errors.
Here is his screenshot: