Use leases for leader election

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

artifacts/flagger/account.yaml

@@ -31,6 +31,18 @@ rules:
       - update
       - patch
       - delete
+  - apiGroups:
+      - "coordination.k8s.io"
+    resources:
+      - leases
+    verbs:
+      - get
+      - list
+      - watch
+      - create
+      - update
+      - patch
+      - delete
   - apiGroups:
       - apps
     resources:

charts/flagger/templates/rbac.yaml

@@ -27,6 +27,18 @@ rules:
       - update
       - patch
       - delete
+  - apiGroups:
+      - "coordination.k8s.io"
+    resources:
+      - leases
+    verbs:
+      - get
+      - list
+      - watch
+      - create
+      - update
+      - patch
+      - delete
   - apiGroups:
       - apps
     resources:

cmd/flagger/main.go

@@ -325,7 +325,7 @@ func startLeaderElection(ctx context.Context, run func(), ns string, kubeClient
 	id = id + "_" + string(uuid.NewUUID())
 
 	lock, err := resourcelock.New(
-		resourcelock.ConfigMapsResourceLock,
+		resourcelock.ConfigMapsLeasesResourceLock,
 		ns,
 		configMapName,
 		kubeClient.CoreV1(),

kustomize/base/flagger/rbac.yaml

@@ -21,6 +21,18 @@ rules:
       - update
       - patch
       - delete
+  - apiGroups:
+      - "coordination.k8s.io"
+    resources:
+      - leases
+    verbs:
+      - get
+      - list
+      - watch
+      - create
+      - update
+      - patch
+      - delete
   - apiGroups:
       - apps
     resources: