feat: add ServiceMonitor support to helm chart (#114)

* Scrape metrics automatically when using Prometheus operator

Signed-off-by: Kevin Lefevre <archi@kiln.fi>

k8s/commit-boost/templates/servicemonitor.yaml

@@ -0,0 +1,41 @@
+{{- if .Values.serviceMonitor.enabled -}}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "commit-boost.fullname" . }}
+{{- if .Values.serviceMonitor.namespace }}
+  namespace: {{ .Values.serviceMonitor.namespace | quote }}
+{{- end }}
+  labels:
+    {{- include "commit-boost.labels" . | nindent 4 }}
+  {{- if .Values.serviceMonitor.additionalLabels }}
+    {{- toYaml .Values.serviceMonitor.additionalLabels | nindent 4 }}
+  {{- end }}
+spec:
+  endpoints:
+    - port: http-metrics
+      interval: {{ .Values.serviceMonitor.scrapeInterval }}
+    {{- if .Values.serviceMonitor.honorLabels }}
+      honorLabels: true
+    {{- end }}
+    {{- if .Values.serviceMonitor.metricRelabelings }}
+      metricRelabelings: {{ toYaml .Values.serviceMonitor.metricRelabelings | nindent 8 }}
+    {{- end }}
+      path: {{ .Values.serviceMonitor.path }}
+{{- if .Values.serviceMonitor.namespaceSelector }}
+  namespaceSelector: {{ toYaml .Values.serviceMonitor.namespaceSelector | nindent 4 }}
+{{ else }}
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+{{- end }}
+{{- if .Values.serviceMonitor.targetLabels }}
+  targetLabels:
+  {{- range .Values.serviceMonitor.targetLabels }}
+    - {{ . }}
+  {{- end }}
+{{- end }}
+  selector:
+    matchLabels:
+      {{- include "commit-boost.selectorLabels" . | nindent 6 }}
+{{- end }}

k8s/commit-boost/values.yaml

@@ -27,10 +27,12 @@ serviceAccount:
 podAnnotations: {}
 podLabels: {}
 
-podSecurityContext: {}
+podSecurityContext:
+  {}
   # fsGroup: 2000
 
-securityContext: {}
+securityContext:
+  {}
   # capabilities:
   #   drop:
   #   - ALL
@@ -46,7 +48,8 @@ service:
 ingress:
   enabled: false
   className: ""
-  annotations: {}
+  annotations:
+    {}
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
   hosts:
@@ -59,7 +62,8 @@ ingress:
   #    hosts:
   #      - chart-example.local
 
-resources: {}
+resources:
+  {}
   # We usually recommend not to specify default resources and to leave this as a conscious
   # choice for the user. This also increases chances charts run on environments with little
   # resources, such as Minikube. If you do want to specify resources, uncomment the following
@@ -97,6 +101,21 @@ tolerations: []
 
 affinity: {}
 
+serviceMonitor:
+  enabled: false
+  additionalLabels: {}
+  namespace: ""
+  namespaceSelector: {}
+  # Default: scrape .Release.Namespace only
+  # To scrape all, use the following:
+  # namespaceSelector:
+  #   any: true
+  scrapeInterval: 30s
+  # honorLabels: true
+  targetLabels: []
+  metricRelabelings: []
+  # path: /metrics
+
 commitBoost:
   pbs:
     enable: true