diff --git a/web/cypress/e2e/coo/02.acm_alerting_ui.cy.ts b/web/cypress/e2e/coo/02.acm_alerting_ui.cy.ts
new file mode 100644
index 00000000..b56a464f
--- /dev/null
+++ b/web/cypress/e2e/coo/02.acm_alerting_ui.cy.ts
@@ -0,0 +1,56 @@
+// 02.acm_alerting_ui.cy.ts
+// E2E test for validating ACM Alerting UI integration with Cluster Observability Operator (COO)
+import { commonPages } from '../../views/common';
+import { nav } from '../../views/nav';
+
+const MCP = {
+  namespace: 'openshift-cluster-observability-operator',
+  packageName: 'cluster-observability-operator',
+  operatorName: 'Cluster Observability Operator',
+  config: {
+    kind: 'UIPlugin',
+    name: 'monitoring',
+  },
+};
+
+const MP = {
+  namespace: 'openshift-monitoring',
+  operatorName: 'Cluster Monitoring Operator',
+};
+
+describe('ACM Alerting UI', () => {
+  before(() => {
+    cy.beforeBlockCOO(MCP, MP);
+    cy.log('=== [Setup] Installing ACM operator and MultiCluster Observability ===');
+    // install acm through shell script
+    cy.exec('bash ./cypress/fixtures/coo/acm-install.sh', {
+    env: { KUBECONFIG: Cypress.env('KUBECONFIG_PATH'), },
+    failOnNonZeroExit: false,
+    timeout: 600000, // long time script
+    });
+    // update UIPlugin with the acm related content, (OCP enabled since installed from operatorHub)
+    cy.exec(`oc apply -f ./cypress/fixtures/coo/acm-uiplugin.yaml --kubeconfig ${Cypress.env('KUBECONFIG_PATH')}`);
+    // add thanos-ruler-custom-rules
+    cy.exec(`oc apply -f ./cypress/fixtures/coo/acm-alerrule-test.yaml --kubeconfig ${Cypress.env('KUBECONFIG_PATH')}`);
+  });
+
+  it('Admin perspective - Observe Menu', () => {
+    //cy.visit('/');
+    nav.sidenav.clickNavLink(['Observe', 'Alerting']);
+    commonPages.titleShouldHaveText('Alerting');
+    
+    // TO DO:
+    // Fleet Management => local-cluster => Observe => Alerting
+    
+    cy.log('✅ ACM Alerting UI test completed successfully');
+  });
+
+after(() => {
+  cy.log('=== [Teardown] Uninstalling ACM operator and cleaning up ===');
+  cy.exec('bash ./cypress/fixtures/coo/acm-uninstall.sh', {
+    env: { KUBECONFIG: Cypress.env('KUBECONFIG_PATH') },
+    failOnNonZeroExit: false,
+    timeout: 600000,
+  });
+});
+});
diff --git a/web/cypress/fixtures/coo/acm-alerrule-test.yaml b/web/cypress/fixtures/coo/acm-alerrule-test.yaml
new file mode 100644
index 00000000..5f2b564a
--- /dev/null
+++ b/web/cypress/fixtures/coo/acm-alerrule-test.yaml
@@ -0,0 +1,42 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: thanos-ruler-custom-rules
+  namespace: open-cluster-management-observability
+data:
+  custom_rules.yaml: |
+    groups:
+      - name: alertrule-testing
+        rules:
+        - alert: Watchdog
+          annotations:
+            summary: An alert that should always be firing to certify that Alertmanager is working properly.
+            description: This is an alert meant to ensure that the entire alerting pipeline is functional.
+          expr: vector(1)
+          labels:
+            instance: "local"
+            cluster: "local"
+            clusterID: "111111111"
+            severity: info
+        - alert: Watchdog-spoke
+          annotations:
+            summary: An alert that should always be firing to certify that Alertmanager is working properly.
+            description: This is an alert meant to ensure that the entire alerting pipeline is functional.
+          expr: vector(1)
+          labels:
+            instance: "spoke"
+            cluster: "spoke"
+            clusterID: "22222222"
+            severity: warn
+      - name: cluster-health
+        rules:
+        - alert: ClusterCPUHealth-jb
+          annotations:
+            summary: Notify when CPU utilization on a cluster is greater than the defined utilization limit
+            description: "The cluster has a high CPU usage: core for"
+          expr: |
+            max(cluster:cpu_usage_cores:sum) by (clusterID, cluster, prometheus) > 0
+          labels:
+            cluster: "{{ $labels.cluster }}"
+            prometheus: "{{ $labels.prometheus }}"
+            severity: critical
diff --git a/web/cypress/fixtures/coo/acm-install.sh b/web/cypress/fixtures/coo/acm-install.sh
new file mode 100755
index 00000000..3711f920
--- /dev/null
+++ b/web/cypress/fixtures/coo/acm-install.sh
@@ -0,0 +1,168 @@
+#!/bin/bash
+set -eux
+oc patch Scheduler cluster --type='json' -p '[{ "op": "replace", "path": "/spec/mastersSchedulable", "value": true }]'
+
+oc apply -f - <<EOF
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: open-cluster-management
+---
+apiVersion: operators.coreos.com/v1
+kind: OperatorGroup
+metadata:
+  namespace: open-cluster-management
+  name: og-global
+  labels:
+    og_label: open-cluster-management
+spec:
+  targetNamespaces:
+  - open-cluster-management
+  upgradeStrategy: Default
+EOF
+oc apply -f - <<EOF
+---
+apiVersion: operators.coreos.com/v1alpha1
+kind: Subscription
+metadata:
+  labels:
+    operators.coreos.com/advanced-cluster-management.open-cluster-management: ""
+  name: advanced-cluster-management
+  namespace: open-cluster-management
+spec:
+  installPlanApproval: Automatic
+  name: advanced-cluster-management
+  source: redhat-operators
+  sourceNamespace: openshift-marketplace
+---
+EOF
+tries=30
+while [[ $tries -gt 0 ]] &&
+	! oc -n open-cluster-management rollout status deploy/multiclusterhub-operator; do
+	sleep 10
+	((tries--))
+done
+oc wait -n open-cluster-management --for=condition=Available deploy/multiclusterhub-operator --timeout=300s
+oc apply -f - <<EOF
+apiVersion: operator.open-cluster-management.io/v1
+kind: MultiClusterHub
+metadata:
+  name: multiclusterhub
+  namespace: open-cluster-management
+spec: {}
+EOF
+sleep 5m
+oc wait -n open-cluster-management --for=condition=Available deploy/search-api --timeout=300s
+oc wait -n open-cluster-management --for=condition=Available deploy/search-collector --timeout=300s
+oc wait -n open-cluster-management --for=condition=Available deploy/search-indexer --timeout=300s
+oc -n open-cluster-management get pod
+#create multi-cluster
+oc create ns open-cluster-management-observability || true
+oc apply -f -<<EOF
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: minio
+  namespace: open-cluster-management-observability
+  labels:
+    app.kubernetes.io/name: minio
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: minio
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: minio
+    spec:
+      containers:
+      - command:
+        - /bin/sh
+        - -c
+        - mkdir -p /storage/thanos && /usr/bin/minio server /storage
+        env:
+        - name: MINIO_ACCESS_KEY
+          value: minio
+        - name: MINIO_SECRET_KEY
+          value: minio123
+        image:  quay.io/minio/minio:RELEASE.2021-08-25T00-41-18Z
+        name: minio
+        ports:
+        - containerPort: 9000
+          protocol: TCP
+        volumeMounts:
+        - mountPath: /storage
+          name: storage
+      volumes:
+      - name: storage
+        persistentVolumeClaim:
+          claimName: minio
+EOF
+oc apply -f - <<EOF
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  labels:
+    app.kubernetes.io/name: minio
+  name: minio
+  namespace: open-cluster-management-observability
+spec:
+  storageClassName: gp3-csi
+  accessModes:
+  - ReadWriteOnce
+  resources:
+    requests:
+      storage: "1Gi"
+EOF
+oc apply -f - <<EOF
+apiVersion: v1
+stringData:
+  thanos.yaml: |
+    type: s3
+    config:
+      bucket: "thanos"
+      endpoint: "minio:9000"
+      insecure: true
+      access_key: "minio"
+      secret_key: "minio123"
+kind: Secret
+metadata:
+  name: thanos-object-storage
+  namespace: open-cluster-management-observability
+type: Opaque
+EOF
+oc apply -f -<<EOF
+apiVersion: v1
+kind: Service
+metadata:
+  name: minio
+  namespace: open-cluster-management-observability
+spec:
+  ports:
+  - port: 9000
+    protocol: TCP
+    targetPort: 9000
+  selector:
+    app.kubernetes.io/name: minio
+  type: ClusterIP
+EOF
+oc wait -n open-cluster-management-observability --for=condition=Available deploy/minio --timeout=300s
+oc apply -f - <<EOF
+apiVersion: observability.open-cluster-management.io/v1beta2
+kind: MultiClusterObservability
+metadata:
+  name: observability
+spec:
+  observabilityAddonSpec: {}
+  storageConfig:
+    metricObjectStorage:
+      name: thanos-object-storage
+      key: thanos.yaml 
+EOF
+sleep 1m
+oc wait --for=condition=Ready pod -l alertmanager=observability,app=multicluster-observability-alertmanager -n open-cluster-management-observability --timeout=300s
+oc -n open-cluster-management-observability get pod
+oc -n open-cluster-management-observability get svc | grep -E 'alertmanager|rbac-query'
diff --git a/web/cypress/fixtures/coo/acm-uiplugin.yaml b/web/cypress/fixtures/coo/acm-uiplugin.yaml
new file mode 100644
index 00000000..cda8194f
--- /dev/null
+++ b/web/cypress/fixtures/coo/acm-uiplugin.yaml
@@ -0,0 +1,13 @@
+apiVersion: observability.openshift.io/v1alpha1
+kind: UIPlugin
+metadata:
+  name: monitoring
+spec:
+  monitoring:
+    acm:    
+      enabled: true
+      alertmanager:
+        url: 'https://alertmanager.open-cluster-management-observability.svc:9095'
+      thanosQuerier:
+        url: 'https://rbac-query-proxy.open-cluster-management-observability.svc:8443'
+  type: Monitoring
diff --git a/web/cypress/fixtures/coo/acm-uninstall.sh b/web/cypress/fixtures/coo/acm-uninstall.sh
new file mode 100755
index 00000000..adf8f32f
--- /dev/null
+++ b/web/cypress/fixtures/coo/acm-uninstall.sh
@@ -0,0 +1,44 @@
+#!/bin/bash
+set -eux
+echo "[ACM Uninstall] Using KUBECONFIG=${KUBECONFIG:-~/.kube/config}"
+
+# --- Step 1: delete MultiClusterObservability ---
+echo "[ACM Uninstall] Deleting MultiClusterObservability (MCO)..."
+oc delete MultiClusterObservability observability -n open-cluster-management-observability --ignore-not-found=true
+
+# --- Step 2: delete MinIO、PVC、Secret、Service ---
+echo "[ACM Uninstall] Cleaning up MinIO and related resources..."
+oc delete deploy minio -n open-cluster-management-observability --ignore-not-found=true
+oc delete pvc minio -n open-cluster-management-observability --ignore-not-found=true
+oc delete secret thanos-object-storage -n open-cluster-management-observability --ignore-not-found=true
+oc delete svc minio -n open-cluster-management-observability --ignore-not-found=true
+
+# --- Step 3: delete MultiClusterHub ---
+echo "[ACM Uninstall] Deleting MultiClusterHub..."
+oc delete MultiClusterHub multiclusterhub -n open-cluster-management --ignore-not-found=true
+
+# wait for MultiClusterHub deleted
+echo "[ACM Uninstall] Waiting for MultiClusterHub cleanup..."
+oc wait MultiClusterHub multiclusterhub -n open-cluster-management --for=delete --timeout=180s || true
+
+# --- Step 4: delete Subscription and OperatorGroup ---
+echo "[ACM Uninstall] Deleting ACM Operator Subscription & OperatorGroup..."
+oc delete sub advanced-cluster-management -n open-cluster-management --ignore-not-found=true
+oc delete og og-global -n open-cluster-management --ignore-not-found=true
+
+# --- Step 5: delete namespace ---
+echo "[ACM Uninstall] Deleting ACM-related namespaces..."
+oc delete ns open-cluster-management-observability --ignore-not-found=true
+oc delete ns open-cluster-management --ignore-not-found=true
+
+# # --- Step 6: clean up CRDs（optional）---
+# echo "[ACM Uninstall] Cleaning up CRDs (optional cleanup)..."
+# oc delete crd multiclusterhubs.operator.open-cluster-management.io --ignore-not-found=true
+# oc delete crd multiclusterobservabilities.observability.open-cluster-management.io --ignore-not-found=true
+
+# --- Step 7: Pod / Finalizer ---
+# echo "[ACM Uninstall] Removing potential finalizers..."
+# oc get ns open-cluster-management-observability -o json | jq '.spec.finalizers=[]' | oc replace --raw "/api/v1/namespaces/open-cluster-management-observability/finalize" -f - || true
+# oc get ns open-cluster-management -o json | jq '.spec.finalizers=[]' | oc replace --raw "/api/v1/namespaces/open-cluster-management/finalize" -f - || true
+
+echo "[ACM Uninstall] ✅ Completed cleanup."