The real answer here is that montecarlo prediction of how many issues/tickets/whatever get closed at the team level is all your PM needs. If someone is suspect

The real answer here is that montecarlo prediction of how many issues/tickets/whatever get closed at the team level is all your PM needs. If someone is suspected of not meeting expectations, then that is up the manager. At that point you would need to see what areas everyone contributes to, how that aligns with the performance policy, and which metrics might be useful for measuring those things. Of course you need to also try to evaluate bias in all that.