feat: support custom labels for internal service

This change allows configuring labels specifically for the internal
service without affecting the main controller service, useful for
external-dns configuration.

charts/ingress-nginx/ci/controller-service-internal-values.yaml

@@ -11,3 +11,6 @@ controller:
       enabled: true
       annotations:
         service.beta.kubernetes.io/aws-load-balancer-internal: "true"
+      labels:
+        external-dns.alpha.kubernetes.io/hostname: internal.example.com
+

charts/ingress-nginx/templates/controller-service-internal.yaml

@@ -12,6 +12,9 @@ metadata:
   {{- if .Values.controller.service.labels }}
     {{- toYaml .Values.controller.service.labels | nindent 4 }}
   {{- end }}
+  {{- if .Values.controller.service.internal.labels }}
+    {{- toYaml .Values.controller.service.internal.labels | nindent 4 }}
+  {{- end }}
   name: {{ include "ingress-nginx.controller.fullname" . }}-internal
   namespace: {{ include "ingress-nginx.namespace" . }}
 spec:

charts/ingress-nginx/values.yaml

@@ -580,6 +580,8 @@ controller:
       # -- Type of the internal controller service.
       # Defaults to the value of `controller.service.type`.
       # Ref: https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types
+      labels: {}
+      # -- Type of the internal controller service.
       type: ""
       # -- Pre-defined cluster internal IP address of the internal controller service. Take care of collisions with existing services.
       # This value is immutable. Set once, it can not be changed without deleting and re-creating the service.