Why does Google Webmaster Tools show a complete stoppage of indexing after "update"?

• The lack of a domain name is the first reason Google will not index your site. This could be because you're using the wrong URL for the content or because WordPress isn't set up correctly.
• Since Google adopted Mobile-First indexing, having a mobile-friendly website is essential for getting your site indexed.
• You'll lose rankings and visitors no matter how good your website's content is if it isn't optimised for viewing on a smartphone or tablet.
• If you use a complex coding language, Google will not index your site. It makes no difference what language is used - it could be old or new, like JavaScript – as long as the settings are incorrect and cause crawling and indexing problems.
• Slow-loading websites are less likely to be included in Google's index's top results. It could be due to a variety of circumstances if your site takes a long time to load.
• It's also possible that you have too much content on the page for the user's browser to handle, or that you're utilising an old server with restricted resources.

Read More: Why are webmaster search queries results not showing in search analytics?