fwiw, one of our core principals is around being transparent where we can. If there are shenanigans going on, those are very unwelcome, especially the higher up you go in the org. Do some managers try to get individual metrics? I'm sure it is possible. But when managers have done similar side stepping of the intent of our values, the hammer comes down pretty hard on them.

When it comes to reviews and such, it is more predicated on how well you've supported business goals, how well the team did so too, and some peer feedback. Managers are working with us daily, so it would be odd for the manager to not have direct knowledge on what the individual contributors do well or areas that are in need of improvement.