xds/internal/xdsclient: Emit unknown for CSM Labels if not present in CDS (#7309)

xds/internal/balancer/cdsbalancer/aggregate_cluster_test.go

@@ -33,6 +33,7 @@ import (
 	"google.golang.org/grpc/internal/testutils/xds/e2e"
 	"google.golang.org/grpc/serviceconfig"
 	"google.golang.org/grpc/status"
+	"google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/balancer/clusterresolver"
 
 	v3clusterpb "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
@@ -85,6 +86,7 @@ func (s) TestAggregateClusterSuccess_LeafNode(t *testing.T) {
 					Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 					EDSServiceName:   serviceName,
 					OutlierDetection: json.RawMessage(`{}`),
+					TelemetryLabels:  internal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 			},
@@ -94,6 +96,7 @@ func (s) TestAggregateClusterSuccess_LeafNode(t *testing.T) {
 					Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 					EDSServiceName:   serviceName + "-new",
 					OutlierDetection: json.RawMessage(`{}`),
+					TelemetryLabels:  internal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 			},
@@ -108,6 +111,7 @@ func (s) TestAggregateClusterSuccess_LeafNode(t *testing.T) {
 					Type:             clusterresolver.DiscoveryMechanismTypeLogicalDNS,
 					DNSHostname:      "dns_host:8080",
 					OutlierDetection: json.RawMessage(`{}`),
+					TelemetryLabels:  internal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 			},
@@ -117,6 +121,7 @@ func (s) TestAggregateClusterSuccess_LeafNode(t *testing.T) {
 					Type:             clusterresolver.DiscoveryMechanismTypeLogicalDNS,
 					DNSHostname:      "dns_host_new:8080",
 					OutlierDetection: json.RawMessage(`{}`),
+					TelemetryLabels:  internal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 			},
@@ -211,12 +216,14 @@ func (s) TestAggregateClusterSuccess_ThenUpdateChildClusters(t *testing.T) {
 				Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 				EDSServiceName:   serviceName,
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 			{
 				Cluster:          dnsClusterName,
 				Type:             clusterresolver.DiscoveryMechanismTypeLogicalDNS,
 				DNSHostname:      fmt.Sprintf("%s:%d", dnsHostName, dnsPort),
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 		},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
@@ -247,12 +254,14 @@ func (s) TestAggregateClusterSuccess_ThenUpdateChildClusters(t *testing.T) {
 				Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 				EDSServiceName:   serviceName,
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 			{
 				Cluster:          dnsClusterNameNew,
 				Type:             clusterresolver.DiscoveryMechanismTypeLogicalDNS,
 				DNSHostname:      fmt.Sprintf("%s:%d", dnsHostNameNew, dnsPort),
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 		},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
@@ -298,12 +307,14 @@ func (s) TestAggregateClusterSuccess_ThenChangeRootToEDS(t *testing.T) {
 				Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 				EDSServiceName:   serviceName,
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 			{
 				Cluster:          dnsClusterName,
 				Type:             clusterresolver.DiscoveryMechanismTypeLogicalDNS,
 				DNSHostname:      fmt.Sprintf("%s:%d", dnsHostName, dnsPort),
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 		},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
@@ -329,6 +340,7 @@ func (s) TestAggregateClusterSuccess_ThenChangeRootToEDS(t *testing.T) {
 			Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 			EDSServiceName:   serviceName,
 			OutlierDetection: json.RawMessage(`{}`),
+			TelemetryLabels:  internal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}
@@ -363,6 +375,7 @@ func (s) TestAggregatedClusterSuccess_SwitchBetweenLeafAndAggregate(t *testing.T
 			Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 			EDSServiceName:   serviceName,
 			OutlierDetection: json.RawMessage(`{}`),
+			TelemetryLabels:  internal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}
@@ -391,12 +404,14 @@ func (s) TestAggregatedClusterSuccess_SwitchBetweenLeafAndAggregate(t *testing.T
 				Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 				EDSServiceName:   serviceName,
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 			{
 				Cluster:          dnsClusterName,
 				Type:             clusterresolver.DiscoveryMechanismTypeLogicalDNS,
 				DNSHostname:      fmt.Sprintf("%s:%d", dnsHostName, dnsPort),
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 		},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
@@ -420,6 +435,7 @@ func (s) TestAggregatedClusterSuccess_SwitchBetweenLeafAndAggregate(t *testing.T
 			Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 			EDSServiceName:   serviceName,
 			OutlierDetection: json.RawMessage(`{}`),
+			TelemetryLabels:  internal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}
@@ -572,6 +588,7 @@ func (s) TestAggregatedClusterSuccess_DiamondDependency(t *testing.T) {
 			Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 			EDSServiceName:   serviceName,
 			OutlierDetection: json.RawMessage(`{}`),
+			TelemetryLabels:  internal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}
@@ -639,12 +656,14 @@ func (s) TestAggregatedClusterSuccess_IgnoreDups(t *testing.T) {
 				Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 				EDSServiceName:   serviceName,
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 			{
 				Cluster:          clusterNameD,
 				Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 				EDSServiceName:   serviceName,
 				OutlierDetection: json.RawMessage(`{}`),
+				TelemetryLabels:  internal.UnknownCSMLabels,
 			},
 		},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
@@ -727,6 +746,7 @@ func (s) TestAggregatedCluster_NodeChildOfItself(t *testing.T) {
 			Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 			EDSServiceName:   serviceName,
 			OutlierDetection: json.RawMessage(`{}`),
+			TelemetryLabels:  internal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}
@@ -832,6 +852,7 @@ func (s) TestAggregatedCluster_CycleWithLeafNode(t *testing.T) {
 			Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 			EDSServiceName:   serviceName,
 			OutlierDetection: json.RawMessage(`{}`),
+			TelemetryLabels:  internal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}

xds/internal/balancer/cdsbalancer/cdsbalancer_test.go

@@ -42,6 +42,7 @@ import (
 	"google.golang.org/grpc/resolver/manual"
 	"google.golang.org/grpc/serviceconfig"
 	"google.golang.org/grpc/status"
+	xdsinternal "google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/balancer/clusterresolver"
 	"google.golang.org/grpc/xds/internal/xdsclient"
 	"google.golang.org/grpc/xds/internal/xdsclient/xdsresource"
@@ -456,6 +457,7 @@ func (s) TestClusterUpdate_Success(t *testing.T) {
 					EDSServiceName:        serviceName,
 					MaxConcurrentRequests: newUint32(512),
 					OutlierDetection:      json.RawMessage(`{}`),
+					TelemetryLabels:       xdsinternal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 			},
@@ -483,6 +485,7 @@ func (s) TestClusterUpdate_Success(t *testing.T) {
 					Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 					EDSServiceName:   serviceName,
 					OutlierDetection: json.RawMessage(`{}`),
+					TelemetryLabels:  xdsinternal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"ring_hash_experimental": {"minRingSize":100, "maxRingSize":1000}}]`),
 			},
@@ -505,6 +508,7 @@ func (s) TestClusterUpdate_Success(t *testing.T) {
 					Type:             clusterresolver.DiscoveryMechanismTypeEDS,
 					EDSServiceName:   serviceName,
 					OutlierDetection: json.RawMessage(`{"successRateEjection":{}}`),
+					TelemetryLabels:  xdsinternal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"ring_hash_experimental": {"minRingSize":1024, "maxRingSize":8388608}}]`),
 			},
@@ -557,6 +561,7 @@ func (s) TestClusterUpdate_Success(t *testing.T) {
 							"requestVolume": 50
 						}
 					}`),
+					TelemetryLabels: xdsinternal.UnknownCSMLabels,
 				}},
 				XDSLBPolicy: json.RawMessage(`[{"ring_hash_experimental": {"minRingSize":1024, "maxRingSize":8388608}}]`),
 			},
@@ -609,6 +614,7 @@ func (s) TestClusterUpdate_SuccessWithLRS(t *testing.T) {
 			EDSServiceName:      serviceName,
 			LoadReportingServer: lrsServerCfg,
 			OutlierDetection:    json.RawMessage(`{}`),
+			TelemetryLabels:     xdsinternal.UnknownCSMLabels,
 		}},
 		XDSLBPolicy: json.RawMessage(`[{"xds_wrr_locality_experimental": {"childPolicy": [{"round_robin": {}}]}}]`),
 	}

xds/internal/balancer/clusterresolver/e2e_test/balancer_test.go

@@ -41,6 +41,7 @@ import (
 	"google.golang.org/grpc/resolver/manual"
 	"google.golang.org/grpc/serviceconfig"
 	"google.golang.org/grpc/status"
+	xdsinternal "google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/balancer/clusterimpl"
 	"google.golang.org/grpc/xds/internal/balancer/outlierdetection"
 	"google.golang.org/grpc/xds/internal/balancer/priority"
@@ -400,8 +401,9 @@ func (s) TestOutlierDetectionConfigPropagationToChildPolicy(t *testing.T) {
 						ChildPolicy: &iserviceconfig.BalancerConfig{
 							Name: clusterimpl.Name,
 							Config: &clusterimpl.LBConfig{
-								Cluster:        clusterName,
-								EDSServiceName: edsServiceName,
+								Cluster:         clusterName,
+								EDSServiceName:  edsServiceName,
+								TelemetryLabels: xdsinternal.UnknownCSMLabels,
 								ChildPolicy: &iserviceconfig.BalancerConfig{
 									Name: wrrlocality.Name,
 									Config: &wrrlocality.LBConfig{

xds/internal/internal.go

@@ -83,3 +83,10 @@ func SetLocalityID(addr resolver.Address, l LocalityID) resolver.Address {
 
 // ResourceTypeMapForTesting maps TypeUrl to corresponding ResourceType.
 var ResourceTypeMapForTesting map[string]any
+
+// UnknownCSMLabels are TelemetryLabels emitted from CDS if CSM Telemetry Label
+// data is not present in the CDS Resource.
+var UnknownCSMLabels = map[string]string{
+	"csm.service_name":           "unknown",
+	"csm.service_namespace_name": "unknown",
+}

xds/internal/xdsclient/tests/cds_watchers_test.go

@@ -103,7 +103,7 @@ func verifyClusterUpdate(ctx context.Context, updateCh *testutils.Channel, wantU
 			return fmt.Errorf("received update with error type %v, want %v", gotType, wantType)
 		}
 	}
-	cmpOpts := []cmp.Option{cmpopts.EquateEmpty(), cmpopts.IgnoreFields(xdsresource.ClusterUpdate{}, "Raw", "LBPolicy")}
+	cmpOpts := []cmp.Option{cmpopts.EquateEmpty(), cmpopts.IgnoreFields(xdsresource.ClusterUpdate{}, "Raw", "LBPolicy", "TelemetryLabels")}
 	if diff := cmp.Diff(wantUpdate.update, got.update, cmpOpts...); diff != "" {
 		return fmt.Errorf("received unexpected diff in the cluster resource update: (-want, got):\n%s", diff)
 	}

xds/internal/xdsclient/tests/resource_update_test.go

@@ -875,7 +875,7 @@ func (s) TestHandleClusterResponseFromManagementServer(t *testing.T) {
 			}
 			cmpOpts := []cmp.Option{
 				cmpopts.EquateEmpty(),
-				cmpopts.IgnoreFields(xdsresource.ClusterUpdate{}, "Raw", "LBPolicy"),
+				cmpopts.IgnoreFields(xdsresource.ClusterUpdate{}, "Raw", "LBPolicy", "TelemetryLabels"),
 			}
 			if diff := cmp.Diff(test.wantUpdate, gotUpdate, cmpOpts...); diff != "" {
 				t.Fatalf("Unexpected diff in metadata, diff (-want +got):\n%s", diff)

xds/internal/xdsclient/xdsresource/tests/unmarshal_cds_test.go

@@ -34,6 +34,7 @@ import (
 	"google.golang.org/grpc/internal/testutils/xds/e2e"
 	"google.golang.org/grpc/internal/xds/bootstrap"
 	"google.golang.org/grpc/serviceconfig"
+	"google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/balancer/ringhash"
 	"google.golang.org/grpc/xds/internal/balancer/wrrlocality"
 	"google.golang.org/grpc/xds/internal/xdsclient/xdsresource"
@@ -141,9 +142,10 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				},
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName: clusterName,
-				ClusterType: xdsresource.ClusterTypeLogicalDNS,
-				DNSHostName: "dns_host:8080",
+				ClusterName:     clusterName,
+				ClusterType:     xdsresource.ClusterTypeLogicalDNS,
+				DNSHostName:     "dns_host:8080",
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -172,6 +174,7 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				ClusterName:             clusterName,
 				ClusterType:             xdsresource.ClusterTypeAggregate,
 				PrioritizedClusterNames: []string{"a", "b", "c"},
+				TelemetryLabels:         internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -183,9 +186,12 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 			},
 		},
 		{
-			name:       "happy-case-no-service-name-no-lrs",
-			cluster:    e2e.DefaultCluster(clusterName, "", e2e.SecurityLevelNone),
-			wantUpdate: xdsresource.ClusterUpdate{ClusterName: clusterName},
+			name:    "happy-case-no-service-name-no-lrs",
+			cluster: e2e.DefaultCluster(clusterName, "", e2e.SecurityLevelNone),
+			wantUpdate: xdsresource.ClusterUpdate{
+				ClusterName:     clusterName,
+				TelemetryLabels: internal.UnknownCSMLabels,
+			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
 				Config: &wrrlocality.LBConfig{
@@ -199,8 +205,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 			name:    "happy-case-no-lrs",
 			cluster: e2e.DefaultCluster(clusterName, serviceName, e2e.SecurityLevelNone),
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -223,6 +230,7 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				ClusterName:     clusterName,
 				EDSServiceName:  serviceName,
 				LRSServerConfig: serverCfg,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -261,6 +269,7 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				EDSServiceName:  serviceName,
 				LRSServerConfig: serverCfg,
 				MaxRequests:     func() *uint32 { i := uint32(512); return &i }(),
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -279,8 +288,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				return c
 			}(),
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: "ring_hash_experimental",
@@ -306,8 +316,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				LbPolicy: v3clusterpb.Cluster_LEAST_REQUEST,
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: "least_request_experimental",
@@ -330,8 +341,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				return c
 			}(),
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: "ring_hash_experimental",
@@ -362,8 +374,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				},
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: "least_request_experimental",
@@ -400,8 +413,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				},
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: "ring_hash_experimental",
@@ -435,8 +449,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				},
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -474,8 +489,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				},
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: wrrlocality.Name,
@@ -522,8 +538,9 @@ func (s) TestValidateCluster_Success(t *testing.T) {
 				},
 			},
 			wantUpdate: xdsresource.ClusterUpdate{
-				ClusterName:    clusterName,
-				EDSServiceName: serviceName,
+				ClusterName:     clusterName,
+				EDSServiceName:  serviceName,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 			wantLBConfig: &iserviceconfig.BalancerConfig{
 				Name: "ring_hash_experimental",

xds/internal/xdsclient/xdsresource/unmarshal_cds.go

@@ -100,6 +100,15 @@ func validateClusterAndConstructClusterUpdate(cluster *v3clusterpb.Cluster, serv
 			}
 		}
 	}
+	// "The values for the service labels csm.service_name and
+	// csm.service_namespace_name come from xDS, “unknown” if not present." -
+	// CSM Design.
+	if _, ok := telemetryLabels["csm.service_name"]; !ok {
+		telemetryLabels["csm.service_name"] = "unknown"
+	}
+	if _, ok := telemetryLabels["csm.service_namespace_name"]; !ok {
+		telemetryLabels["csm.service_namespace_name"] = "unknown"
+	}
 
 	var lbPolicy json.RawMessage
 	var err error

xds/internal/xdsclient/xdsresource/unmarshal_cds_test.go

@@ -29,6 +29,7 @@ import (
 	"google.golang.org/grpc/internal/testutils"
 	"google.golang.org/grpc/internal/xds/bootstrap"
 	"google.golang.org/grpc/internal/xds/matcher"
+	"google.golang.org/grpc/xds/internal"
 	"google.golang.org/grpc/xds/internal/xdsclient/xdsresource/version"
 
 	v3clusterpb "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
@@ -873,6 +874,7 @@ func (s) TestValidateClusterWithSecurityConfig(t *testing.T) {
 					RootInstanceName: rootPluginInstance,
 					RootCertName:     rootCertName,
 				},
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -914,6 +916,7 @@ func (s) TestValidateClusterWithSecurityConfig(t *testing.T) {
 					RootInstanceName: rootPluginInstance,
 					RootCertName:     rootCertName,
 				},
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -959,6 +962,7 @@ func (s) TestValidateClusterWithSecurityConfig(t *testing.T) {
 					IdentityInstanceName: identityPluginInstance,
 					IdentityCertName:     identityCertName,
 				},
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -1006,6 +1010,7 @@ func (s) TestValidateClusterWithSecurityConfig(t *testing.T) {
 					IdentityInstanceName: identityPluginInstance,
 					IdentityCertName:     identityCertName,
 				},
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -1072,6 +1077,7 @@ func (s) TestValidateClusterWithSecurityConfig(t *testing.T) {
 						matcher.StringMatcherForTesting(nil, nil, nil, newStringP(sanContains), nil, false),
 					},
 				},
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -1138,6 +1144,7 @@ func (s) TestValidateClusterWithSecurityConfig(t *testing.T) {
 						matcher.StringMatcherForTesting(nil, nil, nil, newStringP(sanContains), nil, false),
 					},
 				},
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 	}
@@ -1331,6 +1338,7 @@ func (s) TestUnmarshalCluster(t *testing.T) {
 				EDSServiceName:  v3Service,
 				LRSServerConfig: serverCfg,
 				Raw:             v3ClusterAny,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -1343,6 +1351,7 @@ func (s) TestUnmarshalCluster(t *testing.T) {
 				EDSServiceName:  v3Service,
 				LRSServerConfig: serverCfg,
 				Raw:             v3ClusterAny,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -1355,6 +1364,7 @@ func (s) TestUnmarshalCluster(t *testing.T) {
 				EDSServiceName:  v3Service,
 				LRSServerConfig: serverCfg,
 				Raw:             v3ClusterAnyWithEDSConfigSourceSelf,
+				TelemetryLabels: internal.UnknownCSMLabels,
 			},
 		},
 		{
@@ -1384,7 +1394,8 @@ func (s) TestUnmarshalCluster(t *testing.T) {
 				LRSServerConfig: serverCfg,
 				Raw:             v3ClusterAnyWithTelemetryLabelsIgnoreSome,
 				TelemetryLabels: map[string]string{
-					"csm.service_name": "grpc-service",
+					"csm.service_name":           "grpc-service",
+					"csm.service_namespace_name": "unknown",
 				},
 			},
 		},