code: func (s *GenericAPIServer) AddPostStartHook(name string, hook PostStartHookFunc) error {
  	if len(name) == 0 {
  		return fmt.Errorf("missing name")
  	}
  	if hook == nil {
  		return nil
  	}
  	if s.disabledPostStartHooks.Has(name) {
  		return nil
  	}
  
  	s.postStartHookLock.Lock()
  	defer s.postStartHookLock.Unlock()
  
  	if s.postStartHooksCalled {
  		return fmt.Errorf("unable to add %q because PostStartHooks have already been called", name)
  	}
  	if postStartHook, exists := s.postStartHooks[name]; exists {
  		// this is programmer error, but it can be hard to debug
  		return fmt.Errorf("unable to add %q because it was already registered by: %s", name, postStartHook.originatingStack)
  	}
  
  	// done is closed when the poststarthook is finished.  This is used by the health check to be able to indicate
  	// that the poststarthook is finished
  	done := make(chan struct{})
  	if err := s.AddHealthzChecks(postStartHookHealthz{name: "poststarthook/" + name, done: done}); err != nil {
  		return err
  	}
  	s.postStartHooks[name] = postStartHookEntry{hook: hook, originatingStack: string(debug.Stack()), done: done}
  
  	return nil
  }
docs: // AddPostStartHook allows you to add a PostStartHook.