We are currently working to resolve two separate indexing issues that have impacted some URLs. One is with mobile-indexing. The other is with canonicalization, how we detect and handle duplicate content. In either case, pages might not be indexed....
If a previously indexed page has gone, it might be the mobile-indexing issue, where we’re failing to select any page at all to index. If the canonical issue is involved, URL Inspector may show the URL as a duplicate & the Google-selected canonical will be different from it….
There’s no action to take with these issues on the part of site owners. We apologize for the issues here and are working rapidly to resolve them. We’ll update this thread as each is corrected.
Update: it may take days to fully resolve both these issues completely, but we have restored many URLs already and are working quickly to process more. In particular….
The issue with canonicals impacted roughly about 0.02% of our index, beginning around Sept. 20 until late yesterday around 4:30pm PT. We’ve since restored about 10% of those URLs and keep reprocessing more.
The mobile-indexing issue impacted roughly about 0.2% of our index, beginning in early September but really spiking from around the middle of this week through late yesterday. We’ve since restored about 1/4 of those URLs & keep reprocessing more.
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