Google previously announced plans to replace the “Good” and “Best” labels in Responsive Search Ads with real performance metrics. That change is now visible in some accounts, with impression, click, conversion, and other metrics now available for each headline and description.

This allows advertisers to evaluate each asset’s effectiveness more accurately, reviving proper ad copy testing.
To view the data, go to Campaigns → Assets → Assets → Performance tab and enable the relevant columns.
Full rollout is still in progress.
This update was first seen by Bob Meijer and Miles McNair.