For instance, do people "roll up" region/service/environment/instance into a single "name" tag ? This seems ideal for high-level reporting but also verbose and clunky:
e.g. "west1-ec2-prod-apiserver"
Usually Project, Application, Environment are the common ones. You might also see Cost Center, Service, and some others. You're going to want to chat with Finance to see if they have any asks as well.