Services: []*model.Service{
			{
				Hostname:       "adsupdate.example.com",
				DefaultAddress: "10.11.0.1",
				Ports: []*model.Port{
					{
						Name:     "http-main",
						Port:     2080,
						Protocol: protocol.HTTP,
					},
				},
				Attributes: model.ServiceAttributes{
					Name:      "adsupdate",
					Namespace: "default",
				},
			},
			{

	shard := model.ShardKeyFromRegistry(s)
	// This is delete.
	if len(endpoints) == 0 {
		for k := range keys {
			s.XdsUpdater.EDSUpdate(shard, string(k.hostname), k.namespace, nil)
		}
	} else {
		for k, eps := range endpoints {
			s.XdsUpdater.EDSUpdate(shard, string(k.hostname), k.namespace, eps)
		}
	}
}

// buildEndpoints builds endpoints for the instance keys.

	}

	env := model.NewEnvironment()
	env.Watcher = mesh.NewFixedWatcher(m)

	xdsUpdater := opts.XDSUpdater
	if xdsUpdater == nil {
		xdsUpdater = model.NewEndpointIndexUpdater(env.EndpointIndex)
	}

	serviceDiscovery := aggregate.NewController(aggregate.Options{})
	se := serviceentry.NewController(
		configController,
		xdsUpdater,
		env.Watcher,
		serviceentry.WithClusterID(opts.ClusterID))

			s.ConfigUpdate(&model.PushRequest{
				Full:   true,
				Reason: model.NewReasonStats(model.NetworksTrigger),
			})
		})
	}
	var xdsUpdater model.XDSUpdater = s
	if opts.EnableFakeXDSUpdater {
		xdsUpdater = xdsfake.NewWithDelegate(s)
	}
	mc := multicluster.NewFakeController()
	creds := kubesecrets.NewMulticluster(opts.DefaultClusterName, mc)

	SystemNamespace string
	DomainSuffix    string
	ClusterID       cluster.ID
	XDSUpdater      model.XDSUpdater
	Network         LookupNetwork
}

type Options struct {
	Client kubeclient.Client

	Revision        string
	SystemNamespace string
	DomainSuffix    string
	ClusterID       cluster.ID
	XDSUpdater      model.XDSUpdater
	LookupNetwork   LookupNetwork
}

func New(options Options) Index {

		k.MeshServiceController.DeleteRegistry(clusterID, provider.External)
	}
	if err := k.Controller.Cleanup(); err != nil {
		log.Warnf("failed cleaning up services in %s: %v", clusterID, err)
	}
	if k.opts.XDSUpdater != nil {
		k.opts.XDSUpdater.ConfigUpdate(&model.PushRequest{Full: true, Reason: model.NewReasonStats(model.ClusterUpdate)})
	}
}

// Multicluster structure holds the remote kube Controllers and multicluster specific attributes.

	if cfgTarget != madmin.Default {
		// This cannot give an error at this point.
		subSysTargets, _ := s.GetAvailableTargets(subSys)
		subSysTargetsSet := set.CreateStringSet(subSysTargets...)
		if isUpdate && !subSysTargetsSet.Contains(cfgTarget) {
			return ErrAdminConfigIDPCfgNameDoesNotExist
		}
		if !isUpdate && subSysTargetsSet.Contains(cfgTarget) {

	ClusterAliases map[string]string

	// Metrics for capturing node-based metrics.
	Metrics model.Metrics

	// XDSUpdater will push changes to the xDS server.
	XDSUpdater model.XDSUpdater

	// MeshNetworksWatcher observes changes to the mesh networks config.
	MeshNetworksWatcher mesh.NetworksWatcher

	// MeshWatcher observes changes to the mesh config

			} else {
				log.Debugf("Handle EDS endpoint: skip collecting workload entry endpoints, service %s/ has not been populated",
					hostname)
			}
		}

		esc.c.opts.XDSUpdater.EDSUpdate(shard, string(hostname), namespace, endpoints)
	}
}

// getPod fetches a pod by name or IP address.
// A pod may be missing (nil) for two reasons:

	ConfigUpdateFunc func(req *PushRequest)
}

var _ XDSUpdater = &EndpointIndexUpdater{}

func NewEndpointIndexUpdater(ei *EndpointIndex) *EndpointIndexUpdater {
	return &EndpointIndexUpdater{Index: ei}
}

func (f *EndpointIndexUpdater) ConfigUpdate(*PushRequest) {}

func (f *EndpointIndexUpdater) EDSUpdate(shard ShardKey, serviceName string, namespace string, eps []*IstioEndpoint) {