code: func (p *priorityPlugin) SetExternalKubeInformerFactory(f informers.SharedInformerFactory) {
  	priorityInformer := f.Scheduling().V1().PriorityClasses()
  	p.lister = priorityInformer.Lister()
  	p.SetReadyFunc(priorityInformer.Informer().HasSynced)
  }
docs: // SetInternalKubeInformerFactory implements the WantsInternalKubeInformerFactory interface.