Thanks for all the info people, this is *kind of* reassuring.
Coverage has gone down to 85% from the usual 95%-98% since August 4, and RPM and CTR have been horrible as well, probably at an all time low. I thought my site might have been problematic so I tried to move around things, but to no avail.
After reading this thread, I guess it's time to leave things exactly as they were before and hang tight. Let's totally hope this is just a bug and not permanent.
P.S. If you look at it statistically wise, it seems like whole bunch of advertisers suddenly vanished from AdSense, which is practically impossible.
One thing that comes to mind though is an article recently published on Business Insider about ads.txt and Google taking action against bogus ads (article here: [
uk.businessinsider.com...]
Here's a quote taken from Business Insider talking about a 15 minutes test Google did with big advertisers:
During these tests, Google and the partners shut off all of their programmatic ad inventory for brief periods, say, 10 to 15 minutes, and then scour the ad exchanges to see what's listed. Google and its partners found thousands if not millions of video and display ad spots still available on multiple ad exchanges, despite no ads actually being for sale at that time
Maybe they're doing that same 15 minutes test they did with those advertisers, but on a much bigger scale? That could somewhat explain the low coverage and lack of inventory we're all seeing.
[edited by: janvitos at 2:02 am (utc) on Aug 9, 2017]