Last week we reported that the crawl stats report seemed to be buggy. Well, Google confirmed the bug by posting both on Twitter and the data anomalies page about the issue.
Google wrote:
February 20-21, 2018Some users may see lower than usual levels of time spent downloading in the Crawl Stats report during this time period. This was a reporting issue only and did not affect site appearance on search.
If you're seeing a weird drop in the Crawl Stats in Search Console for a day last week, that's a reporting issue on our side which you can ignore. Sorry for the confusion & hope your week otherwise starts off great! https://t.co/FFzFDERr6K
— John ☆.o(≧▽≦)o.☆ (@JohnMu) February 26, 2018
Here is what it looks like under Google Search Console -> Crawl Stats report:
Forum discussion at Twitter.