add service type metadata to kubernetes_sd_config service role #6496 (#6684)

* [service discovery] add service type metadata to kubernetes_sd_config service role

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

* [fix] ServiceType -> string

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

* [fix] fix testcase

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

* [style]

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

* [doc] add service type

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

* [doc] sort

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

discovery/kubernetes/service.go

@@ -152,6 +152,7 @@ const (
 	servicePortProtocolLabel       = metaLabelPrefix + "service_port_protocol"
 	serviceClusterIPLabel          = metaLabelPrefix + "service_cluster_ip"
 	serviceExternalNameLabel       = metaLabelPrefix + "service_external_name"
+	serviceType                    = metaLabelPrefix + "service_type"
 )
 
 func serviceLabels(svc *apiv1.Service) model.LabelSet {
@@ -188,6 +189,7 @@ func (s *Service) buildService(svc *apiv1.Service) *targetgroup.Group {
 			model.AddressLabel:       lv(addr),
 			servicePortNameLabel:     lv(port.Name),
 			servicePortProtocolLabel: lv(string(port.Protocol)),
+			serviceType:              lv(string(svc.Spec.Type)),
 		}
 
 		if svc.Spec.Type == apiv1.ServiceTypeExternalName {

discovery/kubernetes/service_test.go

@@ -112,6 +112,7 @@ func TestServiceDiscoveryAdd(t *testing.T) {
 					{
 						"__meta_kubernetes_service_port_protocol": "TCP",
 						"__address__":                          "testservice.default.svc:30900",
+						"__meta_kubernetes_service_type":       "ClusterIP",
 						"__meta_kubernetes_service_cluster_ip": "10.0.0.1",
 						"__meta_kubernetes_service_port_name":  "testport",
 					},
@@ -127,6 +128,7 @@ func TestServiceDiscoveryAdd(t *testing.T) {
 					{
 						"__meta_kubernetes_service_port_protocol": "TCP",
 						"__address__":                             "testservice-external.default.svc:31900",
+						"__meta_kubernetes_service_type":          "ExternalName",
 						"__meta_kubernetes_service_port_name":     "testport",
 						"__meta_kubernetes_service_external_name": "FooExternalName",
 					},
@@ -175,12 +177,14 @@ func TestServiceDiscoveryUpdate(t *testing.T) {
 					{
 						"__meta_kubernetes_service_port_protocol": "TCP",
 						"__address__":                          "testservice.default.svc:30900",
+						"__meta_kubernetes_service_type":       "ClusterIP",
 						"__meta_kubernetes_service_cluster_ip": "10.0.0.1",
 						"__meta_kubernetes_service_port_name":  "testport0",
 					},
 					{
 						"__meta_kubernetes_service_port_protocol": "UDP",
 						"__address__":                          "testservice.default.svc:30901",
+						"__meta_kubernetes_service_type":       "ClusterIP",
 						"__meta_kubernetes_service_cluster_ip": "10.0.0.1",
 						"__meta_kubernetes_service_port_name":  "testport1",
 					},
@@ -218,6 +222,7 @@ func TestServiceDiscoveryNamespaces(t *testing.T) {
 					{
 						"__meta_kubernetes_service_port_protocol": "TCP",
 						"__address__":                          "testservice.ns1.svc:30900",
+						"__meta_kubernetes_service_type":       "ClusterIP",
 						"__meta_kubernetes_service_cluster_ip": "10.0.0.1",
 						"__meta_kubernetes_service_port_name":  "testport",
 					},
@@ -233,6 +238,7 @@ func TestServiceDiscoveryNamespaces(t *testing.T) {
 					{
 						"__meta_kubernetes_service_port_protocol": "TCP",
 						"__address__":                          "testservice.ns2.svc:30900",
+						"__meta_kubernetes_service_type":       "ClusterIP",
 						"__meta_kubernetes_service_cluster_ip": "10.0.0.1",
 						"__meta_kubernetes_service_port_name":  "testport",
 					},

docs/configuration/configuration.md

@@ -743,6 +743,7 @@ Available meta labels:
 * `__meta_kubernetes_service_name`: The name of the service object.
 * `__meta_kubernetes_service_port_name`: Name of the service port for the target.
 * `__meta_kubernetes_service_port_protocol`: Protocol of the service port for the target.
+* `__meta_kubernetes_service_type`: The type of the service.
 
 #### `pod`