func startHorizontalPodAutoscalerControllerWithRESTClient(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller.Interface, bool, error) {

	clientConfig := controllerContext.ClientBuilder.ConfigOrDie("horizontal-pod-autoscaler")
	hpaClient := controllerContext.ClientBuilder.ClientOrDie("horizontal-pod-autoscaler")

	apiVersionsGetter := custom_metrics.NewAvailableAPIsGetter(hpaClient.Discovery())

	if !controllerContext.ComponentConfig.GarbageCollectorController.EnableGarbageCollector {
		return nil, true, fmt.Errorf("storage version migrator requires garbage collector")
	}

	config := controllerContext.ClientBuilder.ConfigOrDie(controllerName)
	client := controllerContext.ClientBuilder.ClientOrDie(controllerName)
	informer := controllerContext.InformerFactory.Storagemigration().V1alpha1().StorageVersionMigrations()

	// the ratelimiter negatively affects its speed.  Deleting 100 total items in a namespace (that's only a few of each resource
	// including events), takes ~10 seconds by default.
	nsKubeconfig := controllerContext.ClientBuilder.ConfigOrDie("namespace-controller")
	nsKubeconfig.QPS *= 20
	nsKubeconfig.Burst *= 100
	namespaceKubeClient := clientset.NewForConfigOrDie(nsKubeconfig)

	sharedInformers := informers.NewSharedInformerFactoryWithOptions(versionedClient, ResyncPeriod(s)(), informers.WithTransform(trim))

	metadataClient := metadata.NewForConfigOrDie(rootClientBuilder.ConfigOrDie("metadata-informers"))
	metadataInformers := metadatainformer.NewSharedInformerFactoryWithOptions(metadataClient, ResyncPeriod(s)(), metadatainformer.WithTransform(trim))