lib/promscrape/discovery/kubernetes: add __meta_kubernetes_service_port_number label to role: service in the same way as Prometheus 2.38 does

See https://github.com/prometheus/prometheus/pull/11002

docs/CHANGELOG.md

@@ -19,6 +19,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
 
 * FEATURE: [VictoriaMetrics cluster](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html): improve performance for heavy queries on systems with many CPU cores.
 * FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add support for MX record types in [dns_sd_configs](https://docs.victoriametrics.com/sd_configs.html#dns_sd_configs) in the same way as Prometheus 2.38 [does](https://github.com/prometheus/prometheus/pull/10099).
+* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add `__meta_kubernetes_service_port_number` meta-label for `role: service` in [kubernetes_sd_configs](https://docs.victoriametrics.com/sd_configs.html#kubernetes_sd_configs) in the same way as Prometheus 2.38 [does](https://github.com/prometheus/prometheus/pull/11002).
 * FEATURE: [vmalert](https://docs.victoriametrics.com/vmalert.html): add `toTime()` template function in the same way as Prometheus 2.38 [does](https://github.com/prometheus/prometheus/pull/10993). See [these docs](https://prometheus.io/docs/prometheus/latest/configuration/template_reference/#numbers).
 
 * BUGFIX: prevent from excess CPU usage when the storage enters [read-only mode](https://docs.victoriametrics.com/Cluster-VictoriaMetrics.html#readonly-mode).

docs/sd_configs.md

@@ -756,6 +756,7 @@ One of the following `role` types can be configured to discover targets:
   * `__meta_kubernetes_service_labelpresent_<labelname>`: "true" for each label of the service object.
   * `__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_number`: Service port number 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.
 

lib/promscrape/discovery/kubernetes/service.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"strconv"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
 )
@@ -79,6 +80,7 @@ func (s *Service) getTargetLabels(gw *groupWatcher) []map[string]string {
 		m := map[string]string{
 			"__address__":                             addr,
 			"__meta_kubernetes_service_port_name":     sp.Name,
+			"__meta_kubernetes_service_port_number":   strconv.Itoa(sp.Port),
 			"__meta_kubernetes_service_port_protocol": sp.Protocol,
 		}
 		s.appendCommonLabels(m)

lib/promscrape/discovery/kubernetes/service_test.go

@@ -107,6 +107,7 @@ func TestParseServiceListSuccess(t *testing.T) {
 			"__meta_kubernetes_service_name":          "kube-dns",
 			"__meta_kubernetes_service_type":          "ClusterIP",
 			"__meta_kubernetes_service_port_name":     "dns",
+			"__meta_kubernetes_service_port_number":   "53",
 			"__meta_kubernetes_service_port_protocol": "UDP",
 			"__meta_kubernetes_service_cluster_ip":    "10.96.0.10",
 
@@ -130,6 +131,7 @@ func TestParseServiceListSuccess(t *testing.T) {
 			"__meta_kubernetes_service_name":          "kube-dns",
 			"__meta_kubernetes_service_type":          "ClusterIP",
 			"__meta_kubernetes_service_port_name":     "dns-tcp",
+			"__meta_kubernetes_service_port_number":   "53",
 			"__meta_kubernetes_service_port_protocol": "TCP",
 			"__meta_kubernetes_service_cluster_ip":    "10.96.0.10",
 
@@ -153,6 +155,7 @@ func TestParseServiceListSuccess(t *testing.T) {
 			"__meta_kubernetes_service_name":          "kube-dns",
 			"__meta_kubernetes_service_type":          "ClusterIP",
 			"__meta_kubernetes_service_port_name":     "metrics",
+			"__meta_kubernetes_service_port_number":   "9153",
 			"__meta_kubernetes_service_port_protocol": "TCP",
 			"__meta_kubernetes_service_cluster_ip":    "10.96.0.10",