nodeController.getPodsAssignedToNode = fakeGetPodsAssignedToNode(item.fakeNodeHandler.Clientset)
		if err := nodeController.syncNodeStore(item.fakeNodeHandler); err != nil {
			t.Errorf("unexpected error: %v", err)
		}
		if err := nodeController.monitorNodeHealth(ctx); err != nil {
			t.Errorf("unexpected error: %v", err)
		}
		if item.timeToPass > 0 {

			StabilityLevel: metrics.STABLE,
		},
		[]string{"zone"},
	)

	updateNodeHealthDuration = metrics.NewHistogram(
		&metrics.HistogramOpts{
			Subsystem:      nodeControllerSubsystem,
			Name:           updateNodeHealthKey,
			Help:           "Duration in seconds for NodeController to update the health of a single node.",

func AddOrUpdateDaemonPodTolerations(spec *v1.PodSpec) {
	// DaemonSet pods shouldn't be deleted by NodeController in case of node problems.
	// Add infinite toleration for taint notReady:NoExecute here
	// to survive taint-based eviction enforced by NodeController
	// when node turns not ready.
	v1helper.AddOrUpdateTolerationInPodSpec(spec, &v1.Toleration{
		Key:      v1.TaintNodeNotReady,

	"k8s.io/klog/v2"
)

const (
	// NodeHealthUpdateRetry controls the number of retries of writing
	// node health update.
	NodeHealthUpdateRetry = 5
	// NodeEvictionPeriod controls how often NodeController will try to
	// evict Pods from non-responsive Nodes.
	NodeEvictionPeriod = 100 * time.Millisecond
	// EvictionRateLimiterBurst is the burst value for all eviction rate
	// limiters
	EvictionRateLimiterBurst = 1
)

	// CIDR range allocations from the cloud to the cluster.
	IPAMFromCloudAllocatorType = "IPAMFromCloud"
)

// TODO: figure out the good setting for those constants.
const (
	// The amount of time the nodecontroller polls on the list nodes endpoint.
	apiserverStartupGracePeriod = 10 * time.Minute

	// The no. of NodeSpec updates NC can process concurrently.
	cidrUpdateWorkers = 30

* NodeController waits for informer sync before doing anything ([#34809](https://github.com/kubernetes/kubernetes/pull/34809), [@gmarek](https://github.com/gmarek))

	// We accept the fact that we may leak CIDRs here. This is safer than releasing
	// them in case when we don't know if request went through.
	// NodeController restart will return all falsely allocated CIDRs to the pool.
	if !apierrors.IsServerTimeout(err) {
		logger.Error(err, "CIDR assignment for node failed. Releasing allocated CIDR", "node", klog.KObj(node))

* Skip safe to detach check if node API object no longer exists ([#30737](https://github.com/kubernetes/kubernetes/pull/30737), [@saad-ali](https://github.com/saad-ali))
* Nodecontroller doesn't flip readiness on pods if kubeletVersion < 1.2.0 ([#30828](https://github.com/kubernetes/kubernetes/pull/30828), [@bprashanth](https://github.com/bprashanth))

API rule violation: names_match,k8s.io/cloud-provider/config/v1alpha1,CloudControllerManagerConfiguration,KubeCloudShared
API rule violation: names_match,k8s.io/cloud-provider/config/v1alpha1,CloudControllerManagerConfiguration,NodeController
API rule violation: names_match,k8s.io/cloud-provider/config/v1alpha1,CloudControllerManagerConfiguration,NodeStatusUpdateFrequency

	stateNormal            = ZoneState("Normal")
	stateFullDisruption    = ZoneState("FullDisruption")
	statePartialDisruption = ZoneState("PartialDisruption")
)

const (
	// The amount of time the nodecontroller should sleep between retrying node health updates
	retrySleepTime   = 20 * time.Millisecond
	nodeNameKeyIndex = "spec.nodeName"
	// podUpdateWorkerSizes assumes that in most cases pod will be handled by monitorNodeHealth pass.