Google's generative AI report is impressions only, and there is now an opt-out toggle
Google's help documentation for the Generative AI performance report is explicit that it excludes "clicks, CTR, position, or query data". It reports impressions in AI Overviews and AI Mode, broken down by page, country, device and date. It is still rolling out to a subset of properties, UK first, and will not appear if a site has too few AI impressions. The same release added a toggle that removes a site from AI Overviews, AI Mode and Discover AI without affecting normal Search ranking.