code: func apiServerHealthy(client clientset.Interface) error {
  	healthStatus := 0
  
  	// If client.Discovery().RESTClient() is nil, the fake client is used, and that means we are dry-running. Just proceed
  	if client.Discovery().RESTClient() == nil {
  		return nil
  	}
  	client.Discovery().RESTClient().Get().AbsPath("/healthz").Do().StatusCode(&healthStatus)
  	if healthStatus != http.StatusOK {
  		return errors.Errorf("the API Server is unhealthy; /healthz didn't return %q", "ok")
  	}
  	return nil
  }
docs: // apiServerHealthy checks whether the API server's /healthz endpoint is healthy