diff --git a/config/default/kustomization.yaml b/config/default/kustomization.yaml
index 07f63fa..3be2864 100644
--- a/config/default/kustomization.yaml
+++ b/config/default/kustomization.yaml
@@ -19,8 +19,7 @@ bases:
 - ../samples
 - ../webhook
 - ../certmanager
-# [PROMETHEUS] To enable prometheus monitor, uncomment all sections with 'PROMETHEUS'.
-#- ../prometheus
+- ../prometheus
 
 patchesStrategicMerge:
 # Mount the controller config file for loading manager configurations
diff --git a/config/install.yaml b/config/install.yaml
index 80bffe8..bc7ca7d 100644
--- a/config/install.yaml
+++ b/config/install.yaml
@@ -2317,6 +2317,9 @@ spec:
         - containerPort: 9443
           name: webhook-server
           protocol: TCP
+        - containerPort: 8080
+          name: metrics
+          protocol: TCP
         readinessProbe:
           httpGet:
             path: /readyz
@@ -2418,6 +2421,25 @@ spec:
           name: root-client-certs
           namespace: kamaji-system
 ---
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    control-plane: controller-manager
+  name: kamaji-controller-manager-metrics-monitor
+  namespace: kamaji-system
+spec:
+  endpoints:
+  - path: /metrics
+    port: metrics
+    scheme: http
+  namespaceSelector:
+    matchNames:
+    - kamaji-system
+  selector:
+    matchLabels:
+      control-plane: controller-manager
+---
 apiVersion: admissionregistration.k8s.io/v1
 kind: MutatingWebhookConfiguration
 metadata:
diff --git a/config/manager/manager.yaml b/config/manager/manager.yaml
index 1c51a1e..efa1c20 100644
--- a/config/manager/manager.yaml
+++ b/config/manager/manager.yaml
@@ -42,6 +42,10 @@ spec:
         image: controller:latest
         imagePullPolicy: Always
         name: manager
+        ports:
+          - containerPort: 8080
+            name: metrics
+            protocol: TCP
         securityContext:
           allowPrivilegeEscalation: false
         livenessProbe:
diff --git a/config/prometheus/kustomization.yaml b/config/prometheus/kustomization.yaml
index ed13716..81dff32 100644
--- a/config/prometheus/kustomization.yaml
+++ b/config/prometheus/kustomization.yaml
@@ -1,2 +1,5 @@
 resources:
 - monitor.yaml
+
+configurations:
+- kustomizeconfig.yaml
diff --git a/config/prometheus/kustomizeconfig.yaml b/config/prometheus/kustomizeconfig.yaml
new file mode 100644
index 0000000..27806ca
--- /dev/null
+++ b/config/prometheus/kustomizeconfig.yaml
@@ -0,0 +1,4 @@
+varReference:
+  - kind: ServiceMonitor
+    group: monitoring.coreos.com
+    path: spec/namespaceSelector/matchNames
diff --git a/config/prometheus/monitor.yaml b/config/prometheus/monitor.yaml
index d19136a..f3edc5d 100644
--- a/config/prometheus/monitor.yaml
+++ b/config/prometheus/monitor.yaml
@@ -1,4 +1,3 @@
-
 # Prometheus Monitor Service (Metrics)
 apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
@@ -10,11 +9,11 @@ metadata:
 spec:
   endpoints:
     - path: /metrics
-      port: https
-      scheme: https
-      bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
-      tlsConfig:
-        insecureSkipVerify: true
+      port: metrics
+      scheme: http
+  namespaceSelector:
+    matchNames:
+      - $(SERVICE_NAMESPACE)
   selector:
     matchLabels:
       control-plane: controller-manager