Alerts when active sessions are at capacity for X hours or more

When we had the original session count of 20, we noticed that the number of running sessions would sometimes get quite full when we had to do a mass maintenance session (e.g. Office updates when there was a vulnerability). While we don’t see this as often now, it does occasionally come up

We would like a way to get automatically alerted when our session count is at capacity for an extended period (ideally an editable threshold), so we can better understand when our “busy times” are, and if our maintenance needs to be cut down to keep sessions shorter.