lib/promscrape/discovery/kubernetes: add missing __meta_kubernetes_ingress_class_name label for role: ingress

See 7e65ad3e43
and 7e1111ff14

docs/CHANGELOG.md

@@ -24,6 +24,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
 * FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add service discovery for [Yandex Cloud](https://cloud.yandex.com/en/). See [these docs](https://docs.victoriametrics.com/sd_configs.html#yandexcloud_sd_configs) and [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1386).
 
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): properly handle custom `endpoint` value in [ec2_sd_configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#ec2_sd_config). It was ignored since [v1.77.0](https://docs.victoriametrics.com/CHANGELOG.html#v1770) because of a bug in the implementation of [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1287).
+* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): add missing `__meta_kubernetes_ingress_class_name` meta-label for `role: ingress` service discovery in Kubernetes. See [this commit from Prometheus](https://github.com/prometheus/prometheus/commit/7e65ad3e432bd2837c17e3e63e85dcbcc30f4a8a).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): allow stale responses from Consul service discovery (aka [consul_sd_configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#consul_sd_config)) by default in the same way as Prometheus does. This should reduce load on Consul when discovering big number of targets. Stale responses can be disabled by specifying `allow_stale: false` option in `consul_sd_config`.
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): [dockerswarm_sd_configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config): properly set `__meta_dockerswarm_container_label_*` labels instead of `__meta_dockerswarm_task_label_*` labels as Prometheus does. See [this issue](https://github.com/prometheus/prometheus/issues/9187).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): set `up` metric to `0` for partial scrapes in [stream parsing mode](https://docs.victoriametrics.com/vmagent.html#stream-parsing-mode). Previously the `up` metric was set to `1` when at least a single metric has been scraped before the error. This aligns the behaviour of `vmselect` with Prometheus.

lib/promscrape/discovery/kubernetes/ingress.go

@@ -52,8 +52,9 @@ type Ingress struct {
 //
 // See https://v1-21.docs.kubernetes.io/docs/reference/generated/kubernetes-api/v1.21/#ingressspec-v1-networking-k8s-io
 type IngressSpec struct {
-	TLS   []IngressTLS `json:"tls"`
-	Rules []IngressRule
+	TLS              []IngressTLS `json:"tls"`
+	Rules            []IngressRule
+	IngressClassName string
 }
 
 // IngressTLS represents ingress TLS spec in k8s.
@@ -130,12 +131,13 @@ func matchesHostPattern(pattern, host string) bool {
 
 func getLabelsForIngressPath(ig *Ingress, scheme, host, path string) map[string]string {
 	m := map[string]string{
-		"__address__":                      host,
-		"__meta_kubernetes_namespace":      ig.Metadata.Namespace,
-		"__meta_kubernetes_ingress_name":   ig.Metadata.Name,
-		"__meta_kubernetes_ingress_scheme": scheme,
-		"__meta_kubernetes_ingress_host":   host,
-		"__meta_kubernetes_ingress_path":   path,
+		"__address__":                          host,
+		"__meta_kubernetes_namespace":          ig.Metadata.Namespace,
+		"__meta_kubernetes_ingress_name":       ig.Metadata.Name,
+		"__meta_kubernetes_ingress_scheme":     scheme,
+		"__meta_kubernetes_ingress_host":       host,
+		"__meta_kubernetes_ingress_path":       path,
+		"__meta_kubernetes_ingress_class_name": ig.Spec.IngressClassName,
 	}
 	ig.Metadata.registerLabelsAndAnnotations("__meta_kubernetes_ingress", m)
 	return m

lib/promscrape/discovery/kubernetes/ingress_test.go

@@ -78,7 +78,8 @@ func TestParseIngressListSuccess(t *testing.T) {
 	  {
             "host": "foobar"
           }
-	]
+	],
+	"ingressClassName": "foo-class"
       },
       "status": {
         "loadBalancer": {
@@ -107,11 +108,12 @@ func TestParseIngressListSuccess(t *testing.T) {
 			"__address__": "foobar",
 			"__meta_kubernetes_ingress_annotation_kubectl_kubernetes_io_last_applied_configuration":        `{"apiVersion":"networking.k8s.io/v1","kind":"Ingress","metadata":{"annotations":{},"name":"test-ingress","namespace":"default"},"spec":{"backend":{"serviceName":"testsvc","servicePort":80}}}` + "\n",
 			"__meta_kubernetes_ingress_annotationpresent_kubectl_kubernetes_io_last_applied_configuration": "true",
-			"__meta_kubernetes_ingress_host":   "foobar",
-			"__meta_kubernetes_ingress_name":   "test-ingress",
-			"__meta_kubernetes_ingress_path":   "/",
-			"__meta_kubernetes_ingress_scheme": "http",
-			"__meta_kubernetes_namespace":      "default",
+			"__meta_kubernetes_ingress_host":       "foobar",
+			"__meta_kubernetes_ingress_name":       "test-ingress",
+			"__meta_kubernetes_ingress_path":       "/",
+			"__meta_kubernetes_ingress_scheme":     "http",
+			"__meta_kubernetes_ingress_class_name": "foo-class",
+			"__meta_kubernetes_namespace":          "default",
 		}),
 	}
 	if !areEqualLabelss(sortedLabelss, expectedLabelss) {