Expose metrics service in Kubernetes

Issue: COSI-46

kustomize/base/deployment.yaml

@@ -15,6 +15,10 @@ spec:
         app.kubernetes.io/component: driver
         app.kubernetes.io/version: main
         app.kubernetes.io/managed-by: kustomize
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "8080"
+        prometheus.io/path: "/metrics"
     spec:
       serviceAccountName: scality-object-storage-provisioner
       containers:
@@ -24,6 +28,7 @@ spec:
           args:
             - "--driver-prefix=cosi"
             - "--v=$(COSI_DRIVER_LOG_LEVEL)"
+            - "--metrics-address=0.0.0.0:8080"
           volumeMounts:
             - mountPath: /var/lib/cosi
               name: socket

kustomize/base/kustomization.yaml

@@ -8,3 +8,4 @@ resources:
   - serviceaccount.yaml
   - rbac.yaml
   - deployment.yaml
+  - metrics-service.yaml

kustomize/base/metrics-service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: scality-cosi-metrics
+  labels:
+    app.kubernetes.io/name: scality-cosi-driver
+    app.kubernetes.io/part-of: container-object-storage-interface
+spec:
+  selector:
+    app.kubernetes.io/name: scality-cosi-driver
+  ports:
+    - protocol: TCP
+      port: 8080  # The port Prometheus will scrape
+      targetPort: 8080  # The port exposed by the container

kustomize/base/rbac.yaml

@@ -12,6 +12,9 @@ rules:
   - apiGroups: [""]
     resources: ["secrets", "events"]
     verbs: ["get", "delete", "update", "create"]
+  - apiGroups: [""]
+    resources: ["services", "endpoints"]
+    verbs: ["get", "list", "watch"]
 
 ---
 apiVersion: rbac.authorization.k8s.io/v1

kustomize/overlays/dev/kustomization.yaml

@@ -15,6 +15,7 @@ resources:
   - ../../base/namespace.yaml
   - ../../base/serviceaccount.yaml
   - ../../base/rbac.yaml
+  - ../../metrics-service.yaml
 
 commonLabels:
   app.kubernetes.io/version: main