prometheus: allow for custom labels

* Allows the user to specify custom labels to service, ingress and prometheus
  objects

helm/prometheus/templates/ingress.yaml

@@ -12,6 +12,9 @@ metadata:
     heritage: {{ .Release.Service }}
     prometheus: {{ .Release.Name }}
     release: {{ .Release.Name }}
+{{- if .Values.ingress.labels }}
+{{ toYaml .Values.ingress.labels | indent 4 }}
+{{- end }}
   name: {{ template "fullname" . }}
 spec:
   rules:

helm/prometheus/templates/prometheus.yaml

@@ -7,6 +7,9 @@ metadata:
     heritage: {{ .Release.Service }}
     prometheus: {{ .Release.Name }}
     release: {{ .Release.Name }}
+{{- if .Values.labels }}
+{{ toYaml .Values.labels | indent 4 }}
+{{- end }}
   name: {{ .Release.Name }}
 spec:
 {{- if .Values.alertingEndpoints }}

helm/prometheus/templates/service.yaml

@@ -11,6 +11,9 @@ metadata:
     heritage: {{ .Release.Service }}
     prometheus: {{ .Release.Name }}
     release: {{ .Release.Name }}
+{{- if .Values.service.labels }}
+{{ toYaml .Values.service.labels | indent 4 }}
+{{- end }}
   name: {{ template "fullname" . }}
 spec:
   clusterIP: "{{ .Values.service.clusterIP }}"

helm/prometheus/values.yaml

@@ -29,6 +29,10 @@ image:
   repository: quay.io/prometheus/prometheus
   tag: v1.7.1
 
+## Labels to be added to the Prometheus
+##
+labels: {}
+
 ingress:
   ## If true, Prometheus Ingress will be created
   ##
@@ -40,6 +44,10 @@ ingress:
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
 
+  ## Labels to be added to the Ingress
+  ##
+  labels: {}
+
   fqdn: ""
 
   ## TLS configuration for Prometheus Ingress
@@ -115,6 +123,10 @@ service:
   ##
   externalIPs: []
 
+  ## Labels to be added to the Service
+  ##
+  labels: {}
+
   ## External IP address to assign to Prometheus Service
   ## Only used if service.type is 'LoadBalancer' and supported by cloud provider
   ##