fix(aiops): route backup failures rule-first

apps/api/src/api/v1/webhooks.py

@@ -101,13 +101,13 @@ def _should_bypass_alertmanager_llm(
     rule_response: dict | None,
     alert_category: str,
 ) -> bool:
-    """Host 類告警命中 YAML NO_ACTION 時，直接走人工排查卡片。"""
+    """主機/備份類告警命中 YAML NO_ACTION 時，直接走人工排查卡片。"""
     return (
         rule_response is not None
         and rule_response.get("suggested_action") == "NO_ACTION"
         and not str(rule_response.get("kubectl_command", "")).strip()
         and rule_response.get("rule_id", "") not in ("generic_fallback", "")
-        and alert_category == "host_resource"
+        and alert_category in {"host_resource", "backup_failure"}
     )
 
 
@@ -115,9 +115,9 @@ def _should_use_alertmanager_rule_first(
     rule_response: dict | None,
     alert_category: str,
 ) -> bool:
-    """Host 類告警命中權威 YAML 規則時，避免再被 LLM 污染成 K8s 動作。"""
+    """主機/備份類告警命中權威 YAML 規則時，避免再被 LLM 污染成 K8s 動作。"""
 
-    if not rule_response or alert_category != "host_resource":
+    if not rule_response or alert_category not in {"host_resource", "backup_failure"}:
         return False
     if rule_response.get("rule_id", "") in ("generic_fallback", ""):
         return False
@@ -1363,7 +1363,7 @@ async def _process_new_alert_background(
                 alertname=alertname,
                 rule_id=rule_response.get("rule_id", ""),
                 alert_category=alert_category,
-                reason="host_resource YAML 權威規則命中，跳過 LLM 避免產生錯誤 K8s 動作",
+                reason="host/backup YAML 權威規則命中，跳過 LLM 避免產生錯誤 K8s 動作",
             )
             risk_mapping = {
                 "low": RiskLevel.LOW,

apps/api/tests/test_alertmanager_rule_bypass.py

@@ -38,6 +38,16 @@ def test_non_host_category_does_not_bypass_llm():
     assert _should_bypass_alertmanager_llm(rule_response, "kubernetes") is False
 
 
+def test_backup_failure_yaml_no_action_bypasses_llm():
+    rule_response = {
+        "rule_id": "host_backup_failed",
+        "suggested_action": "NO_ACTION",
+        "kubectl_command": "",
+    }
+
+    assert _should_bypass_alertmanager_llm(rule_response, "backup_failure") is True
+
+
 def test_host_resource_ssh_rule_uses_rule_first():
     rule_response = {
         "rule_id": "host_resource_alert",
@@ -48,6 +58,16 @@ def test_host_resource_ssh_rule_uses_rule_first():
     assert _should_use_alertmanager_rule_first(rule_response, "host_resource") is True
 
 
+def test_backup_failure_ssh_rule_uses_rule_first():
+    rule_response = {
+        "rule_id": "host_backup_failed",
+        "suggested_action": "SSH_DIAGNOSE",
+        "kubectl_command": "ssh {host} 'tail -80 backup.log'",
+    }
+
+    assert _should_use_alertmanager_rule_first(rule_response, "backup_failure") is True
+
+
 def test_generic_fallback_does_not_use_rule_first():
     rule_response = {
         "rule_id": "generic_fallback",

docs/LOGBOOK.md

@@ -6,6 +6,20 @@
 
 ---
 
+## 2026-05-01 | HostBackupFailed rule-first e2e 補洞
+
+Live e2e 用 `HostBackupFailed` 打 Alertmanager 後發現 aged backup 告警會被分類成 `backup_failure`，未命中原本只允許 `host_resource` 的 rule-first gate，導致又進 OpenClaw LLM。
+
+### 完成
+- `_should_use_alertmanager_rule_first()` / `_should_bypass_alertmanager_llm()` 納入 `backup_failure`，備份失敗 YAML `SSH_DIAGNOSE` 不再被 LLM 覆蓋成 K8s 動作。
+- `NodeExporterDown` Prometheus rule `auto_repair` 改為 `true`，與 YAML rule catalog 的 exporter restart 策略一致。
+- 補 `backup_failure` NO_ACTION / SSH_DIAGNOSE 單元測試。
+
+### 驗證
+- `python3 -m py_compile apps/api/src/api/v1/webhooks.py` 通過。
+- `cd apps/api && pytest tests/test_alertmanager_rule_bypass.py tests/test_telegram_ai_automation_block.py tests/test_ai_router_diagnose_fallback.py -q` → 24 passed。
+- YAML parse `ops/monitoring/alerts-unified.yml`、`apps/api/alert_rules.yaml` 通過。
+
 ## 2026-04-30 | ADR-104 Playbook 版本化 lineage
 
 承接「自動建立 Playbook」第二段，讓 LLM 生成的改良 Playbook 不覆蓋舊知識，而是形成可審核、可追溯、可替換的版本鏈。

ops/monitoring/alerts-unified.yml

@@ -1022,7 +1022,7 @@ groups:
           team: ops
           alert_category: infrastructure
           notification_type: TYPE-3
-          auto_repair: "false"
+          auto_repair: "true"
         annotations:
           summary: "node-exporter ({{ $labels.instance }}) 停擺"
           description: "主機 {{ $labels.instance }} node-exporter 已停擺 5 分鐘，主機 metrics 中斷。"