Is your feature request related to a problem? Please describe

When looking at tracing, I can easily see pg-pool.connect but I do not see when a client gets released. This can be frustrating when trying to quickly troubleshoot where in a service an issue is occurring - i.e is the client getting stuck and not releasing for some reason. I do keep track of idle clients separately so if they were not getting disconnected I would see the idle value go up, but it would be nice to see the full lifecycle of pg-pool.connect through pg-pool.release when viewing tracing for a specific operation.

Describe the solution you'd like to see

I see a pg-pool.release span when a client gets released in the same way I see a pg-pool.connect span.

Describe alternatives you've considered

Tracking idle clients separately.

Additional context