trackSync(err)

	if err == nil {
		c.serviceQueue.Forget(key)
		return
	}

	if c.serviceQueue.NumRequeues(key) < maxRetries {
		logger.Info("Error syncing endpoint slices for service, retrying", "key", key, "err", err)
		c.serviceQueue.AddRateLimited(key)
		return
	}

	logger.Info("Retry budget exceeded, dropping service out of the queue", "key", key, "err", err)

	startTime := time.Now()

	logger := klog.FromContext(ctx)
	logger = klog.LoggerWithValues(logger, "key", key)

	defer func() {
		logger.V(4).Info("Finished syncing resource quota", "key", key, "duration", time.Since(startTime))
	}()

	namespace, name, err := cache.SplitMetaNamespaceKey(key)
	if err != nil {
		return err
	}

		proxier.logger.Error(err, "Error syncing healthcheck services")
	}
	if err := proxier.serviceHealthServer.SyncEndpoints(proxier.endpointsMap.LocalReadyEndpoints()); err != nil {
		proxier.logger.Error(err, "Error syncing healthcheck endpoints")
	}

	// Finish housekeeping, clear stale conntrack entries for UDP Services

		//  using config 4 - with replica modification sync disabled.
		{ObjectOpts{Name: "xy/c5test", UserTags: "k1=v1", Replica: true}, cfgs[4], false}, // 39. replica syncing disabled, this object is a replica
		{ObjectOpts{Name: "xa/c5test", UserTags: "k1=v1", Replica: false}, cfgs[4], true}, // 40. replica syncing disabled, this object is NOT a replica
	}

	for _, testCase := range testCases {
		testCase := testCase

        when:
        executer.withStackTraceChecksDisabled()
        runAndFail "sync"
        then:
        failure.assertHasDocumentedCause("Cannot access a file in the destination directory. " +
            "Syncing to a directory which contains unreadable content is not supported. " +
            "Use a Copy task with Task.doNotTrackState() instead. " +

	if keyErr != nil {
		logger.Error(err, "Failed to split meta namespace cache key", "key", key)
	}

	if e.queue.NumRequeues(key) < maxRetries {
		logger.V(2).Info("Error syncing endpoints, retrying", "service", klog.KRef(ns, name), "err", err)
		e.queue.AddRateLimited(key)
		return
	}

	logger.Info("Dropping service out of the queue", "service", klog.KRef(ns, name), "err", err)

			"Only works in kubernetes environment.").Get()

	RemoteClusterTimeout = env.Register(
		"PILOT_REMOTE_CLUSTER_TIMEOUT",
		30*time.Second,
		"After this timeout expires, pilot can become ready without syncing data from clusters added via remote-secrets. "+
			"Setting the timeout to 0 disables this behavior.",
	).Get()

	DisableMxALPN = env.Register("PILOT_DISABLE_MX_ALPN", false,

        } else if (isDestinationDir && task instanceof Sync) {
            builder.withSummary("Cannot access a file in the destination directory.")
                .withContext("Syncing to a directory which contains unreadable content is not supported.")
                .withAdvice("Use a Copy task with Task.doNotTrackState() instead.");
        } else {

	defer c.queue.Done(key)

	err := c.syncTree()
	// Handle the error if something went wrong during the execution of the business logic
	if err != nil {
		if c.queue.NumRequeues(key) < 5 {
			klog.Infof("Error syncing cidr %v: %v", key, err)
			c.queue.AddRateLimited(key)
			return true
		}
	}
	c.queue.Forget(key)
	return true
}

// syncTree syncs the ipTrees from the informer cache

}

// HasSynced returns true when all registries have synced
func (c *Controller) HasSynced() bool {
	for _, r := range c.GetRegistries() {
		if !r.HasSynced() {
			log.Debugf("registry %s is syncing", r.Cluster())
			return false
		}
	}
	return true
}

func (c *Controller) AppendServiceHandler(f model.ServiceHandler) {
	c.handlers.AppendServiceHandler(f)
}