// discovery type.
	maybeApplyEdsConfig(mc.cluster)

	cb.applyMetadataExchange(opts.mutable.cluster)

	if service.MeshExternal {
		im := getOrCreateIstioMetadata(mc.cluster)
		im.Fields["external"] = &structpb.Value{
			Kind: &structpb.Value_BoolValue{
				BoolValue: true,
			},
		}
	}

	if destRule != nil {

					"namespace": {
						Kind: &structpb.Value_StringValue{
							StringValue: svc.Attributes.Namespace,
						},
					},
				},
			},
		},
	}
}

func getOrCreateIstioMetadata(cluster *cluster.Cluster) *structpb.Struct {
	if cluster.Metadata == nil {
		cluster.Metadata = &core.Metadata{
			FilterMetadata: map[string]*structpb.Struct{},
		}
	}