Gary Illyes, a representative from Google, confirmed that URLs marked as 'unknown to Google' in Search Console hold no priority in the search engine's indexing process. Adam Gent raised concerns regarding the indexing state, wondering if these URLs indeed represent the lowest crawl priority. Illyes explained that signals collected by Google can result in URLs being forgotten, causing them to move into this 'unknown' state, akin to falling out of consideration entirely. This indicates the importance of maintaining URL visibility to ensure indexing.
If a URL has a status of 'URL is unknown to Google' in Search Console, it means the URL is truly unknown to Google and has no priority.
URLs move between states as we collect signals for them, and in this case, signals made our systems 'forget' that the URL exists.
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