Add metrics service to helm chart

Issue: COSI-46

helm/scality-cosi-driver/templates/deployment.yaml

@@ -7,6 +7,10 @@ metadata:
     app.kubernetes.io/instance: {{ .Release.Name }}
     app.kubernetes.io/part-of: container-object-storage-interface
     app.kubernetes.io/managed-by: {{ .Release.Service }}
+  annotations:
+      prometheus.io/scrape: "true"
+      prometheus.io/port: "8080"
+      prometheus.io/path: "/metrics"
 
 spec:
   replicas: {{ .Values.replicaCount }}
@@ -27,6 +31,7 @@ spec:
           args:
             - "--driver-prefix=cosi"
             - "--v={{ .Values.logLevels.driver }}"
+            - "--metrics-address=0.0.0.0:8080"
           resources:
             limits:
               cpu: {{ .Values.resources.limits.cpu }}

helm/scality-cosi-driver/templates/service.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "scality-cosi-driver.fullname" . }}-metrics
+  labels:
+    app.kubernetes.io/name: {{ include "scality-cosi-driver.name" . }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/part-of: container-object-storage-interface
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+spec:
+  selector:
+    app.kubernetes.io/name: {{ include "scality-cosi-driver.name" . }}
+  ports:
+    - protocol: TCP
+      port: {{ .Values.metrics.port }}
+      targetPort: {{ .Values.metrics.port }}

helm/scality-cosi-driver/values.yaml

@@ -26,6 +26,10 @@ serviceAccount:
   name: scality-object-storage-provisioner
   create: true
 
+metrics:
+  enabled: true
+  port: 8080
+
 
 resources:
   limits: