There is another way around it, tracking who wrote the original code, and then tracking tickets marked as bug in which that code was modified could give a pictu

There is another way around it, tracking who wrote the original code, and then tracking tickets marked as bug in which that code was modified could give a picture of who is producing bugs. It may not be a 100% accurate solution, but if a tool could seamlessly integrate ticket management with development code, that was changed to fix a bug, could be accurately tracked.