Google encountered a bug in the performance reports in the Google Search Console that affected reporting for Google Discover traffic.
The mistake. Between December 8 and December 13, 2019, Google Discover’s impressions and clicks may not have been reported correctly. Google wrote: "Due to an internal issue, data loss appears in the Discover performance report during this period."
Solved. Google said on Monday: "This problem has been fixed." The data seems to be lost, but in the future you shouldn't see this problem after the 13th.
No real impact. This has not affected your website's performance or actual traffic. This was just a reporting error. Google wrote: "Please note that this does not reflect user-related changes for your website, only the data reports in the Search Console."
Google Discover. Google Discover is the name for Google Feed and shows you topics and news about items that interest you. With Google Discover, you can get information about your interests, like your favorite sports team or news site, without having to search for them. The feed can be displayed in Google's mobile app, on the mobile homepage or even on the Google.com desktop homepage.
Google Discover reports. Google added reports for Google Discover access to the Google Search Console last April. There is no other way to track your Google Discover traffic because Google does not share referrer data that you can use to differentiate traffic. So you are mainly dependent on data from the Google Search Console.
Why do we care? If your website receives a lot of traffic from Google Discover and you notice a decrease in traffic based on the reports from Google Search Console. There is no need to worry. It was probably a reporting mistake. You can try to determine whether all of your Google traffic has changed in Google Analytics or your other analytics tools. However, please note that between December 8th and December 13th, there was an error reporting the Google Discover performance reports in the Google Search Console.
About the Author
Barry Schwartz is the Search Engine Land news editor and owner of RustyBrick, a New York-based web consulting firm. He also runs Search Engine Roundtable, a popular search blog on SEM topics.