},
	)

	// SyncProxyRulesLastTimestamp is the timestamp proxy rules were last
	// successfully synced.
	SyncProxyRulesLastTimestamp = metrics.NewGauge(
		&metrics.GaugeOpts{
			Subsystem:      kubeProxySubsystem,
			Name:           "sync_proxy_rules_last_timestamp_seconds",
			Help:           "The last time proxy rules were successfully synced",
			StabilityLevel: metrics.ALPHA,
		},
	)

	v := d.val.Load()
	if v == nil {
		return nil
	}
	return []T{*v}
}

func (d *static[T]) Register(f func(o Event[T])) Syncer {
	return registerHandlerAsBatched[T](d, f)
}

func (d *static[T]) RegisterBatch(f func(o []Event[T], initialSync bool), runExistingState bool) Syncer {
	d.eventHandlers.Insert(f)
	if runExistingState {
		v := d.val.Load()
		if v != nil {
			f([]Event[T]{{
				New:   v,

NAME       CLUSTER      CDS          LDS         EDS         RDS          ECDS         ISTIOD      VERSION
proxy1     cluster1     STALE        SYNCED      SYNCED      NOT SENT     SYNCED       istiod1     1.20
proxy2     cluster2     STALE        SYNCED      STALE       SYNCED       STALE        istiod2     1.19
proxy3     cluster3     NOT SENT     ERROR       STALE       NOT SENT     NOT SENT     istiod3     1.20

	// Should return 200 "OK" irrespective of node syncs
	hs.SyncNode(makeNode(tweakTainted("other")))
	testHTTPHandler(hsTest, http.StatusOK, t)

	// Should return 200 "OK" irrespective of node syncs
	hs.SyncNode(makeNode(tweakTainted(ToBeDeletedTaint)))
	testHTTPHandler(hsTest, http.StatusOK, t)

	// Should return 200 "OK" irrespective of node syncs
	hs.SyncNode(makeNode(tweakTainted("other")))

NAME       CLUSTER      CDS       LDS        EDS        RDS          ECDS         ISTIOD      VERSION
proxy1     cluster1     STALE     SYNCED     SYNCED     NOT SENT     NOT SENT     istiod1     1.20

	}
}

func TestChangedStatus(t *testing.T) {
	syncer := newTestManager(&fake.Clientset{})
	testPod := getTestPod()
	syncer.SetPodStatus(testPod, getRandomPodStatus())
	verifyUpdates(t, syncer, 1)
	syncer.SetPodStatus(testPod, getRandomPodStatus())
	verifyUpdates(t, syncer, 1)
}

func TestChangedStatusKeepsStartTime(t *testing.T) {
	syncer := newTestManager(&fake.Clientset{})
	testPod := getTestPod()

		{ID: "config", SyncStatus: "synced"},
		{ID: "c0", SecretName: "istio-system/s0", SyncStatus: "synced"},
		{ID: "c1", SecretName: "istio-system/s1", SyncStatus: "synced"},
	})

	// Remove one
	c.DeleteSecret("s1")
	assert.EventuallyEqual(t, c.controller.ListRemoteClusters, []cluster.DebugInfo{
		{ID: "config", SyncStatus: "synced"},
		{ID: "c0", SecretName: "istio-system/s0", SyncStatus: "synced"},
	})
}

		if err := rq.resyncMonitors(ctx, newResources); err != nil {
			utilruntime.HandleError(fmt.Errorf("failed to sync resource monitors: %v", err))
			return
		}

		// at this point, we've synced the new resources to our monitors, so record that fact.
		oldResources = newResources

		// wait for caches to fill for a while (our sync period).

func testRunningAddressesWithService(t *testing.T) {
	syncer := makeStatusSyncer(t, "istio-ingress")
	address := syncer.runningAddresses()

	if len(address) != 1 || address[0] != serviceIP {
		t.Errorf("Address is not correctly set to service ip")
	}
}

func testRunningAddressesWithHostname(t *testing.T) {
	syncer := makeStatusSyncer(t, "istio-ingress-hostname")

	address := syncer.runningAddresses()

## Where does it come from?

`apiextensions-apiserver` is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apiextensions-apiserver.