code: func (l *Lifecycle) SetExternalKubeInformerFactory(f informers.SharedInformerFactory) {
  	namespaceInformer := f.Core().V1().Namespaces()
  	l.namespaceLister = namespaceInformer.Lister()
  	l.SetReadyFunc(namespaceInformer.Informer().HasSynced)
  }
docs: // SetExternalKubeInformerFactory implements the WantsExternalKubeInformerFactory interface.