How Do You Measure Customer Success?

A lot of people have built customers success into the d and a of a business, but sometimes either board members or executive want to see c s metrics brought as a value realization. I think netratention is a good metric because it helps me understand, am i retaining thi customean i'm growing them? And it really works for sas pased companies. For others where it's more services dependent, then increase in adoption, increase in usage is important. Third part is having metrics that measure acceleration, setting base lines to say, we want this milestone accomplished in 90 days. How did we do against it? Which customers are doing well, where could we be better? And