code: func NewManager(client clientset.Interface) *Manager {
  	const resyncPeriod = 0
  
  	factory := informers.NewSharedInformerFactory(client, resyncPeriod)
  	lister := factory.Node().V1beta1().RuntimeClasses().Lister()
  
  	return &Manager{
  		informerFactory: factory,
  		lister:          lister,
  	}
  }
docs: // NewManager returns a new RuntimeClass Manager. Run must be called before the manager can be used.