This may already be covered, but I couldn't find the discussion.
Looking through Google Webmaster Tools, I see a major drop in Index Status for all of my sites. On 4/23/17, my largest site had 113,899 pages indexed, which was slightly lower than the 132,829 from January 1.
But after that I see a consistent drop, so that by today it only has 11,402 pages indexed.
I also noticed a drop in revenue and Adsense RPM starting around this time, so I can't help but wonder if they're related.
I don't see anything on or near 4/23/17 listed here:
[
support.google.com...]
Was there a major Google update that would have had an impact on this? Or something else I should be looking at in my own coding? I don't see any real problems listed anywhere in Webmaster Tools.