code: func (f *sharedInformerFactory) Start(stopCh <-chan struct{}) {
  	f.lock.Lock()
  	defer f.lock.Unlock()
  
  	for informerType, informer := range f.informers {
  		if !f.startedInformers[informerType] {
  			go informer.Run(stopCh)
  			f.startedInformers[informerType] = true
  		}
  	}
  }
docs: // Start initializes all requested informers.