Google Webmaster Tweet
 

Google has tweeted on Twitter on 24 May 2019

"We're looking into a new indexing issue that started escalating 6 hours ago. The issue is unrelated to yesterday's outage and we're working hard to resolve it. We'll update this thread when we can provide more information."

What are its effects ?

Summary. Mark all crawl errors as fixed. Go back to your report once a week. Fix 404 errors by redirecting false URLs or changing your internal links and sitemap entries. Try to avoid server errors and ask your developer and server host for help. Deal with the other types of errors and use Google's resources for help.