Explicit logging for feature flags exposed to users

Problem to solve

It would be great to monitor the list of feature flags were exposed to a given set of users using % rollout with feature flags. With this, we could speed up the time to analyze the results and potentially would help QC work.

Proposal

Introduce logging in the feature flag controller and save all the details into the database.

What does success look like, and how can we measure that?

Links / references