When Google is crawling and indexing your site, they keep track of the results and report them in Google search console index coverage report
.It’s basically feedback on the more technical details of your site’s crawling and indexing process. In case they detect pressing issue, they send notification. These notifications are usually delayed though, so dont solely rely on these notifcations to learn about high-impact SEO issues.Google's feedback is categorized in four statuses:
