Is there a list of metrics that are not supported via the Ads Analytics API and only in Twitter Ads UI?
https://dev.twitter.com/ads/analytics/metrics-and-segmentation
Here are some examples that are nowhere to be found in the documentation.
Results
Unfollows
Key conversions
Hashtag 1 - conversation card
Hashtag 2 - conversation card
Hashtag 3 - conversation card
Hashtag 4 - conversation card
Video call to action
Pre-roll video views
Pre-roll video starts
Pre-roll video played 25%
Pre-roll video played 50%
Pre-roll video played 75%
Pre-roll video completions