Google Webmasters is basically how I communicate between google and my websites. Its such place that many plugin or 3rd party software companies collects data such as backlinks, positions etc. (semrush etc.) So its important to understand and follow up if any warning and any bad backlinks pointing our website. Because some other competition companies or some hackers may damage website authority by pointing bad backlinks as black seo strategy. So I do follow up and clean them all thru disasow tool on google!
I can manage hundreds of websites one by one into separated sections and their messages.
Some of my websites had pages that dont exist anymore so I had done 301 redirect hunting, or some of them asking for http to https forwward or www versions that I manage them
Server errors used to be happen. 759k/400k pages have been indexed.
I have been started to fix 404 errors.
I have adjusted and optimized google spider frequency to index and crawl my pages better. as you can see it was up to daily 45k pages with 1.5gb downloaded data by google sometimes. Its kind a crazy traffic just by google spiders right.
760K/390K indexed rate is kind a not bad even I ahd many pages just submitted couple days ago. Images depends how unique they are. in my case image strategy kind a little different.
As you can see how index rate getting better and better.
schema is one of my profession and favorite spot! 13items with errors are only 404 pages on product pages! So its kind a 5578 items on 2022 page is perfectly talking with google.