GroupName is set to var instead of const, since this provides the ability for clients importing the module - github.com/rhobs/obo-prometheus-operator/pkg/apis to manage the operator's objects in a different API group Use `ldflags` in the client side, e.g.: go run -ldflags="-s -X github.com/rhobs/obo-prometheus-operator/pkg/apis/monitoring.GroupName=monitoring.example.com" ./example/client/.