measure outstanding requests

[Dieterbe]

I have seen some examples of hard to explain, sudden memory growth.
i wonder if requests pile up that are not able to be finished.
a gauge that we increment when a request comes in and decrement when it is handled, would give us good insights here.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.