kubernetes/staging/src/k8s.io/controller-manager/app/helper.go

// WaitForAPIServer waits for the API Server's /healthz endpoint to report "ok" with timeout.
func WaitForAPIServer(client clientset.Interface, timeout time.Duration) error { … }

// IsControllerEnabled check if a specified controller enabled or not.
func IsControllerEnabled(name string, disabledByDefaultControllers sets.String, controllers []string) bool { … }