diff --git a/ops/monitoring/service-registry.yaml b/ops/monitoring/service-registry.yaml
index aac5ea77..e566ab8c 100644
--- a/ops/monitoring/service-registry.yaml
+++ b/ops/monitoring/service-registry.yaml
@@ -126,6 +126,120 @@ services:
     owner: devops-team
     criticality: P0
 
+  # --- ArgoCD 完整元件 (Phase O-6 2026-04-10) ---
+  - name: argocd-applicationset-controller
+    type: k8s-deployment
+    namespace: argocd
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P2
+
+  - name: argocd-dex-server
+    type: k8s-deployment
+    namespace: argocd
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P2
+
+  - name: argocd-notifications-controller
+    type: k8s-deployment
+    namespace: argocd
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P2
+
+  - name: argocd-redis
+    type: k8s-deployment
+    namespace: argocd
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P2
+
+  - name: argocd-repo-server
+    type: k8s-deployment
+    namespace: argocd
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P2
+
+  # --- AWOOOI Dev 環境 ---
+  - name: awoooi-api
+    type: k8s-deployment
+    namespace: awoooi-dev
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - pod_crash
+    owner: backend-team
+    criticality: P3
+
+  # --- kube-state-metrics ---
+  - name: kube-state-metrics
+    type: k8s-deployment
+    namespace: kube-state-metrics
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P1
+
+  # --- OTEL Event Exporter ---
+  - name: event-exporter
+    type: k8s-deployment
+    namespace: observability
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+    owner: devops-team
+    criticality: P1
+
+  # --- Velero 備份 ---
+  - name: velero
+    type: k8s-deployment
+    namespace: velero
+    monitoring:
+      prometheus: true
+      sentry: false
+      otel: false
+    alerts:
+      - service_down
+      - backup_failed
+    owner: devops-team
+    criticality: P1
+
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