code: func (m *Stub) NotifyRegistrationStatus(ctx context.Context, status *watcherapi.RegistrationStatus) (*watcherapi.RegistrationStatusResponse, error) {
  	if m.registrationStatus != nil {
  		m.registrationStatus <- *status
  	}
  	if !status.PluginRegistered {
  		log.Println("Registration failed: ", status.Error)
  	}
  	return &watcherapi.RegistrationStatusResponse{}, nil
  }
docs: // NotifyRegistrationStatus receives the registration notification from watcher