fix(ops): route systemd runner baseline alerts

apps/api/alert_rules.yaml

@@ -194,6 +194,35 @@ rules:
           command: "由 AI 根據 evidence snapshot 選擇已驗證 playbook"
       reasoning: "[規則匹配] 長期過載先 read-only 診斷與分流，禁止通用 docker restart；修復必須服務專屬且可回寫 Playbook trust。"
 
+  # 2026-05-05 ogt + Codex: 110 self-hosted runner 是 systemd service，不在 Docker/cAdvisor 覆蓋內。
+  # 原則：AI 可自動診斷 watchdog/quota/restart storm；套用 systemd drop-in 需要 sudo，必須走人工批准或 sudo playbook。
+  - id: systemd_runner_baseline_alert
+    priority: 43
+    description: 110 self-hosted runner systemd watchdog / restart / quota 基線告警
+    match:
+      alertname:
+        - SystemdRunnerRestartSpike
+        - SystemdRunnerWatchdogEnabled
+        - SystemdRunnerMissingResourceQuota
+    response:
+      action_title: "🔍 Systemd Runner 基線診斷 — 需要 sudo 才可修復"
+      description: "110 self-hosted runner 發生 watchdog/restart storm 或缺 CPU/Memory quota。這會讓 CI 與 Sentry/ClickHouse/Gitea 搶主機資源，且 Docker/cAdvisor 看不到。"
+      suggested_action: SSH_DIAGNOSE
+      kubectl_command: "ssh {host} 'systemctl show {unit} -p WatchdogUSec -p NRestarts -p DropInPaths -p CPUQuotaPerSecUSec -p MemoryMax -p ActiveState -p SubState; journalctl -u {unit} --since \"20 minutes ago\" --no-pager | tail -120'"
+      estimated_downtime: "N/A"
+      risk: low
+      responsibility: INFRA
+      responsibility_reasoning: "self-hosted runner 是 bare-metal systemd 資源治理，非 K8s 或 Docker workload"
+      secondary_teams: [SRE]
+      optimization:
+        - type: SYSTEMD_GUARDRAIL
+          description: "人工批准後停用錯誤 watchdog drop-in，並為 runner 加 CPUQuota=200%、MemoryMax=2G"
+          command: "bash scripts/ops/apply-runner-systemd-guardrails.sh --apply"
+        - type: CI_CAPACITY
+          description: "若 110 同時承載 Sentry/ClickHouse/Gitea，不應讓多個 runner 無限制並行"
+          command: "檢查 active jobs、runner 數量與 Gitea Actions concurrency，必要時分流 runner"
+      reasoning: "[規則匹配] systemd runner 過載先 read-only 診斷；改 systemd drop-in 需 sudo 與人工批准，避免 AI 擅自改 host unit。"
+
   - id: high_cpu
     priority: 40
     description: K8s Pod/Deployment CPU 使用率過高