diff --git a/apps/api/Dockerfile b/apps/api/Dockerfile
index 420d1413..220b66a4 100644
--- a/apps/api/Dockerfile
+++ b/apps/api/Dockerfile
@@ -56,6 +56,10 @@ COPY apps/api/models.json ./models.json
 # 2026-04-09 ogt: 規則引擎配置 — alert_rule_engine.py 從此檔載入規則
 COPY apps/api/alert_rules.yaml ./alert_rules.yaml
 
+# Install openssh-client — SSH_COMMAND Playbook 執行路徑需要 ssh binary
+# (2026-04-09 Claude Sonnet 4.6 Asia/Taipei, Bug #6 修正 — python:3.11-slim 無 openssh-client)
+RUN apt-get update && apt-get install -y --no-install-recommends openssh-client && rm -rf /var/lib/apt/lists/*
+
 # Create non-root user
 RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
 USER appuser
diff --git a/apps/api/src/api/v1/webhooks.py b/apps/api/src/api/v1/webhooks.py
index 3ebda8e6..72ea1fe3 100644
--- a/apps/api/src/api/v1/webhooks.py
+++ b/apps/api/src/api/v1/webhooks.py
@@ -1197,7 +1197,15 @@ async def alertmanager_webhook(
         "warning"
     )
 
-    target_resource = alert.labels.get("pod") or alert.labels.get("instance") or alertname
+    # 優先用 component label（Docker 層告警用 component，如 SentryDown → "sentry"）
+    # 次優 pod（K8s 告警），再次 instance（blackbox probe），最後 alertname
+    # (2026-04-09 Claude Sonnet 4.6 Asia/Taipei, Bug #5 修正 — affected_services 匹配 Playbook)
+    target_resource = (
+        alert.labels.get("component")
+        or alert.labels.get("pod")
+        or alert.labels.get("instance")
+        or alertname
+    )
     namespace = alert.labels.get("namespace", "default")
     message = alert.annotations.get("summary") or alert.annotations.get("description") or alertname
 
diff --git a/ops/config/service-registry.yaml b/ops/config/service-registry.yaml
index f68ed681..afb5c162 100644
--- a/ops/config/service-registry.yaml
+++ b/ops/config/service-registry.yaml
@@ -157,6 +157,13 @@ services:
     stateful_level: AUTO
     containers: ["blackbox-exporter"]
 
+  - name: sentry
+    display_name: "Sentry (錯誤追蹤)"
+    host: "192.168.0.110"
+    stateful_level: AUTO
+    reason: "Web server 無狀態，docker compose up -d 即可恢復"
+    containers: ["sentry-web", "sentry-worker", "sentry-cron"]
+
   - name: langfuse
     display_name: "Langfuse (LLMOps)"
     host: "192.168.0.110"