feat(helm): Add ServiceMonitor resource (#212)

Signed-off-by: Nicolas Lamirault <[email protected]>

charts/dragonfly-operator/templates/servicemonitor.yaml

@@ -0,0 +1,40 @@
+{{- if .Values.serviceMonitor.enabled }}
+---
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    {{- include "dragonfly-operator.labels" . | nindent 4 }}
+    app.kubernetes.io/component: controller-manager-metrics
+    {{- if .Values.serviceMonitor.labels }}
+    {{- toYaml .Values.serviceMonitor.labels | nindent 4}}
+    {{- end }}
+  name: {{ include "dragonfly-operator.fullname" . }}-controller-manager-metrics
+spec:
+  endpoints:
+  - targetPort: {{ .Values.service.port }}
+    {{- if .Values.serviceMonitor.interval }}
+    interval: {{ .Values.serviceMonitor.interval }}
+    {{- end }}
+    {{- if .Values.serviceMonitor.telemetryPath }}
+    path: {{ .Values.serviceMonitor.path }}
+    {{- end }}
+    {{- if .Values.serviceMonitor.timeout }}
+    scrapeTimeout: {{ .Values.serviceMonitor.timeout }}
+    {{- end }}
+    {{- if .Values.serviceMonitor.relabelings }}
+    relabelings: 
+    {{ toYaml .Values.serviceMonitor.relabelings | indent 6 }}
+    {{- end }}
+    {{- if .Values.serviceMonitor.metricRelabelings }}
+    metricRelabelings: 
+    {{ toYaml .Values.serviceMonitor.metricRelabelings | indent 6 }}
+    {{- end }}
+  jobLabel: {{ template "dragonfly-operator.fullname" . }}
+  namespaceSelector:
+    matchNames:
+    - {{ .Release.Namespace }}
+  selector:
+    matchLabels:
+      {{- include "dragonfly-operator.selectorLabels" . | nindent 6 }}
+{{- end }}

charts/dragonfly-operator/values.yaml

@@ -125,3 +125,26 @@ manager:
 #                operator: In
 #                values:
 #                  - linux
+
+
+serviceMonitor:
+  # When set true then use a ServiceMonitor to configure scraping
+  enabled: false
+  # Set how frequently Prometheus should scrape
+  interval: 30s
+  # Set path to cloudwatch-exporter telemtery-path
+  path: /metrics
+  # Set labels for the ServiceMonitor, use this to define your scrape label for Prometheus Operator
+  labels: {}
+  # Set timeout for scrape
+  timeout: 10s
+  # Set relabelings for the ServiceMonitor, use to apply to samples before scraping
+  relabelings: []
+  # Set metricRelabelings for the ServiceMonitor, use to apply to samples for ingestion
+  metricRelabelings: []
+  # Example - note the Kubernetes convention of camelCase instead of Prometheus' snake_case
+  # metricRelabelings:
+  #   - sourceLabels: [dbinstance_identifier]
+  #     action: replace
+  #     replacement: mydbname
+  #     targetLabel: dbname