At server side we measure the duration of the initial SLSB call and all inner calls (with a log level higher), also the starting times.
Together with GC CPU I/O it will geive us a picture what is running at a specific time.
This is also active (partialy) in production for monitoring.
The test client is for load tests that (should) be nearly the production reality, but the world change every moment ;)
P.S. Ja, wie schon die Zeitzone aussagt 'waschecht' Deutsch, ob es wenige sind kommt auf die Betrachtungsweise an ;)