I guess for all things mentioned, you could record the numbers automatically, like every week and then create graphs and check the trend.
This should give you a quite good indication of how a team performs over time and to changes, for example, if a lot of new members join or if the workload is increasing.
If your company records over hours you should add these too, so you might see that the performance goes down if there are too many.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
I guess for all things mentioned, you could record the numbers automatically, like every week and then create graphs and check the trend.
This should give you a quite good indication of how a team performs over time and to changes, for example, if a lot of new members join or if the workload is increasing.
If your company records over hours you should add these too, so you might see that the performance goes down if there are too many.