Recommended Settings for the 'Found by Google' Data Source
We recommend disabling the Found by Google data source in the Google Merchant Center Data Sources page.
Even though the page may say, "Google found additional products on your online store.", and provide a link asking you to "Start managing these products", this setting is not recommended.
Your feed service keeps your product listings up-to-date on a regular basis, using every possible product from your store. The feed filters out items that should not be listed, such as disabled products, hidden products, products with zero price, products with no images, etc. Therefore, enabling the 'Found by Google' setting will result in increased errors and warnings, and interfere with the feed service.
If the setting is already enabled, click the three dots icon under the Actions column, select Stop managing products, and then click Confirm. This will disable the setting.
For additional information, see our blog post, Automated Feed Website Crawl vs File Upload in Google Merchant Center.