Here is a governing article.
Here is a position paper from the Volcker Alliance.
Usually I think of this sight as running around screaming their hair is on fire, but this is worth a look.
The ICMA recommends these measures. I, on the other hand, think you should be very careful before operationalizing a measure.
These are some recent items I have seen
I identified these from this source. There are many more posts that you might want to review.
It is my own view that measuring badly is worse than not measuring at all. Here is another view.