If an implementation issue means that you've over-exposed users to an experiment, you can retroactively apply a filter to only analyze people truly exposed to an experiment. This was previously available on Analyze Only experiments on Warehouse Native (to work around over-exposure from 3rd party assignment tools). It is now available for Assign and Analyze experiments (where you're using the Statsig SDKs for assignment).
To do this, use the Filter Exposures by Qualifying Event option on the experiment's setup page (under advanced settings).
This filtering is also possible to do in Custom Queries (under the Explore tab).
Example use case : There is an experiment on search suggestions, visible only when people click into the search box. User's are currently exposed when the search bar renders, but this causes dilution, since all users see the search bar. In this case, we'd want to filter down exposures to users who actually clicked into the search box - so we'd point to a Qualifying Event (defined in SQL) to filter exposures down to this subset of users.