feat(service): add kube_service_ports metric

Signed-off-by: nahuel11500 <[email protected]>

Author: nahuel11500

docs/metrics/service/service-metrics.md

@@ -10,3 +10,4 @@
 | kube_service_spec_external_ip             | Gauge       | Service external ips. One series for each ip                                                                                            |                         | `service`=&lt;service-name&gt; <br> `namespace`=&lt;service-namespace&gt; <br> `uid`=&lt;service-uid&gt; <br> `external_ip`=&lt;external-ip&gt;                                                                                                                                                                                          | STABLE       |
 | kube_service_status_load_balancer_ingress | Gauge       | Service load balancer ingress status                                                                                                    |                         | `service`=&lt;service-name&gt; <br> `namespace`=&lt;service-namespace&gt; <br> `uid`=&lt;service-uid&gt; <br> `ip`=&lt;load-balancer-ingress-ip&gt; <br> `hostname`=&lt;load-balancer-ingress-hostname&gt;                                                                                                                               | STABLE       |
 | kube_service_deletion_timestamp           | Gauge       | Unix deletion timestamp                                                                                                                 | seconds                 | `service`=&lt;service-name&gt; <br> `namespace`=&lt;service-namespace&gt; <br> `uid`=&lt;service-uid&gt;                                                                                                                                                                                                                                 | EXPERIMENTAL |
+| kube_service_ports | Gauge       | Metric providing details about the ports exposed by services.                                                                                  |                         | `service`=&lt;service-name&gt; <br> `namespace`=&lt;service-namespace&gt; <br> `uid`=&lt;service-uid&gt; <br> `port_name`=&lt;service-port-name&gt; <br> `port_protocol`=&lt;service-port-protocol&gt; <br> `port_number`=&lt;service-port-number&gt; <br> `port_target`=&lt;service-port-target&gt; <br> `port_app_protocol`=&lt;service-port-appProtocol&gt; <br> `port_node_number`=&lt;service-node-port-number&gt;                                                      | EXPERIMENTAL       |

internal/store/service.go

@@ -18,6 +18,7 @@ package store
 
 import (
 	"context"
+	"strconv"
 
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -184,6 +185,49 @@ func serviceMetricFamilies(allowAnnotationsList, allowLabelsList []string) []gen
 				}
 			}),
 		),
+		*generator.NewFamilyGeneratorWithStability(
+			"kube_service_ports",
+			"Metric providing details about the ports exposed by services.",
+			metric.Gauge,
+			basemetrics.ALPHA,
+			"",
+			wrapSvcFunc(func(e *v1.Service) *metric.Family {
+				ms := []*metric.Metric{}
+				labelKeys := []string{"port_protocol", "port_number", "port_name", "port_target", "port_node_number", "port_app_protocol"}
+				for _, port := range e.Spec.Ports {
+					appProtocol := ""
+					if port.AppProtocol != nil {
+						appProtocol = *port.AppProtocol
+					}
+					var labelValues []string
+					portNumber := strconv.FormatInt(int64(port.Port), 10)
+					targetPort := port.TargetPort.String()
+					nodePort := ""
+
+					if port.NodePort != 0 {
+						nodePort = strconv.FormatInt(int64(port.NodePort), 10)
+					}
+
+					labelValues = []string{
+						string(port.Protocol),
+						portNumber,
+						port.Name,
+						targetPort,
+						nodePort,
+						appProtocol,
+					}
+
+					ms = append(ms, &metric.Metric{
+						LabelValues: labelValues,
+						LabelKeys:   labelKeys,
+						Value:       1,
+					})
+				}
+				return &metric.Family{
+					Metrics: ms,
+				}
+			}),
+		),
 		*generator.NewFamilyGeneratorWithStability(
 			"kube_service_deletion_timestamp",
 			"Unix deletion timestamp",

internal/store/service_test.go

@@ -22,6 +22,7 @@ import (
 
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/intstr"
 
 	generator "k8s.io/kube-state-metrics/v2/pkg/metric_generator"
 )
@@ -44,6 +45,8 @@ func TestServiceStore(t *testing.T) {
 		# TYPE kube_service_spec_external_ip gauge
 		# HELP kube_service_status_load_balancer_ingress [STABLE] Service load balancer ingress status
 		# TYPE kube_service_status_load_balancer_ingress gauge
+		# HELP kube_service_ports Metric providing details about the ports exposed by services.
+		# TYPE kube_service_ports gauge	
 		# HELP kube_service_deletion_timestamp Unix deletion timestamp
 		# TYPE kube_service_deletion_timestamp gauge
 	`
@@ -70,11 +73,13 @@ func TestServiceStore(t *testing.T) {
 				# HELP kube_service_info [STABLE] Information about service.
 				# HELP kube_service_labels [STABLE] Kubernetes labels converted to Prometheus labels.
 				# HELP kube_service_spec_type [STABLE] Type about service.
+				# HELP kube_service_ports Metric providing details about the ports exposed by services.
 				# TYPE kube_service_annotations gauge
 				# TYPE kube_service_created gauge
 				# TYPE kube_service_info gauge
 				# TYPE kube_service_labels gauge
 				# TYPE kube_service_spec_type gauge
+				# TYPE kube_service_ports gauge	
 				kube_service_created{namespace="default",service="test-service1",uid="uid1"} 1.5e+09
 				kube_service_info{cluster_ip="1.2.3.4",external_name="",external_traffic_policy="",load_balancer_ip="",namespace="default",service="test-service1",uid="uid1"} 1
 				kube_service_spec_type{namespace="default",service="test-service1",type="ClusterIP",uid="uid1"} 1
@@ -85,6 +90,7 @@ func TestServiceStore(t *testing.T) {
 				"kube_service_info",
 				"kube_service_labels",
 				"kube_service_spec_type",
+				"kube_service_ports",
 			},
 		},
 		{
@@ -261,6 +267,35 @@ func TestServiceStore(t *testing.T) {
 				kube_service_spec_type{namespace="default",service="test-service8",uid="uid8",type="LoadBalancer"} 1
 			`,
 		},
+
+		{
+			Obj: &v1.Service{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:              "test-service9",
+					CreationTimestamp: metav1.Time{Time: time.Unix(1500000000, 0)},
+					Namespace:         "default",
+					UID:               "uid9",
+					Labels: map[string]string{
+						"app": "example9",
+					},
+				},
+				Spec: v1.ServiceSpec{
+					ClusterIP:             "1.2.3.14",
+					LoadBalancerIP:        "1.2.3.15",
+					Type:                  v1.ServiceTypeLoadBalancer,
+					ExternalTrafficPolicy: "Local",
+					Ports: []v1.ServicePort{
+						{Port: 80, Protocol: v1.ProtocolTCP, TargetPort: intstr.FromInt(8080), Name: "http", NodePort: 65000, AppProtocol: func(s string) *string { return &s }("grpc")},
+					},
+				},
+			},
+			Want: metadata + `
+				kube_service_created{namespace="default",service="test-service9",uid="uid9"} 1.5e+09
+				kube_service_info{cluster_ip="1.2.3.14",external_name="",external_traffic_policy="Local",load_balancer_ip="1.2.3.15",namespace="default",service="test-service9",uid="uid9"} 1
+				kube_service_spec_type{namespace="default",service="test-service9",uid="uid9",type="LoadBalancer"} 1
+				kube_service_ports{namespace="default",port_app_protocol="grpc",port_name="http",port_node_number="65000",port_number="80",port_protocol="TCP",port_target="8080",service="test-service9",uid="uid9"} 1
+			`,
+		},
 		{
 			Obj: &v1.Service{
 				ObjectMeta: metav1.ObjectMeta{