We had a problem in our environments, where the tracer session does not get killed automatically sometimes when we close the tracer. We had a dependency with the system team to get this fixed permanently. Hence, we had to go to the requestor queue and kill the tracer sessions. This was annoying and affecting the efficiency of the developers.
We added a nifty custom menu on the developer portal that kills all the tracer sessions (including rule tracer) in one click. This greatly eased our lives whenever we encountered this problem.
It would be great if such a menu can be added OOTB to be used in the event the tracer session issues occurs in the future for whatever reasons.