Currently, we have the ability to auto-expire silences upon some time duration from when the silence was created.

However, it is not always known in advance a good estimate for how long of a duration to use (e.g. "will this issue take 30min or 3 hours to fix?").

I feel users would benefit from having the option to expire a silence once the underlying alerts suppressed by the silence resolve (i.e. give the user the option to use time-based expiration (as is done today), or to expire it once all the underlying alerts have resolved). This way a user can say "I am working on the issue and don't need any further notifications, and when I'm done putting out the fire, I don't also need to remember to go back and remove any silences I created for it".