},
			InitialFetchTimeout: durationpb.New(0),
			ResourceApiVersion:  core.ApiVersion_V3,
		},
	}
}

// buildExternalSDSCluster generates a cluster that acts as external SDS server
func (cb *ClusterBuilder) buildExternalSDSCluster(addr string) *cluster.Cluster {
	ep := &endpoint.LbEndpoint{
		HostIdentifier: &endpoint.LbEndpoint_Endpoint{
			Endpoint: &endpoint.Endpoint{

	}

	// if credential socket exists, create a cluster for it
	if proxy.Metadata != nil && proxy.Metadata.Raw[security.CredentialMetaDataName] == "true" {
		clusters = append(clusters, cb.buildExternalSDSCluster(security.CredentialNameSocketPath))
	}
	for _, c := range clusters {
		resources = append(resources, &discovery.Resource{Name: c.Name, Resource: protoconv.MessageToAny(c)})
	}