feat(auto-repair): 打通自動修復閉環 (ADR-058)

問題: 告警鏈路從未呼叫 auto_repair_service，機制完全死路
修正:
1. webhooks.py: alertmanager_webhook 建立 Incident 後觸發 _try_auto_repair_background
2. playbook.py: is_high_quality 門檻降低 (冷啟動期)
   - success_count: 10 → 3
   - success_rate: 95% → 80%
3. tests: test_evaluate_not_high_quality 更新為新門檻

流程: Alertmanager → API → Incident → evaluate → P2以下+高品質Playbook → 自動執行 → Telegram通知

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -53,6 +53,7 @@ from src.services.approval_db import get_approval_service
 
 # Phase 17 P0: Service 層 (消除 Router 直接存取 Redis)
 from src.services.incident_service import get_incident_service
+from src.services.auto_repair_service import AutoRepairService
 
 # Phase 5: OpenClaw AI Engine
 from src.services.openclaw import get_openclaw
@@ -145,6 +146,89 @@ async def create_incident_for_approval(
     return incident.incident_id
 
 
+# =============================================================================
+# 2026-04-05 ogt: 自動修復背景任務 (ADR-058 閉環)
+# =============================================================================
+
+async def _try_auto_repair_background(
+    incident_id: str,
+    approval_id: str,
+    alert_type: str,
+    target_resource: str,
+    namespace: str,
+) -> None:
+    """
+    背景評估並執行自動修復
+
+    流程:
+    1. 重新載入 Incident
+    2. evaluate_auto_repair() — 檢查 P2以下 + 高品質Playbook + 低風險
+    3. 可修復 → execute_auto_repair() 執行
+    4. 不可修復 → 靜默，等人工批准
+    """
+    try:
+        incident_service = get_incident_service()
+        incident = await incident_service.get_from_working_memory(incident_id)
+        if not incident:
+            logger.warning("auto_repair_incident_not_found", incident_id=incident_id)
+            return
+
+        repair_service = AutoRepairService()
+        decision = await repair_service.evaluate_auto_repair(incident)
+
+        logger.info(
+            "auto_repair_decision",
+            incident_id=incident_id,
+            approval_id=approval_id,
+            can_auto_repair=decision.can_auto_repair,
+            reason=decision.reason,
+            blocked_by=decision.blocked_by,
+        )
+
+        if not decision.can_auto_repair:
+            return
+
+        # 執行自動修復
+        logger.info(
+            "auto_repair_executing",
+            incident_id=incident_id,
+            playbook_id=decision.playbook.playbook_id if decision.playbook else None,
+        )
+        result = await repair_service.execute_auto_repair(
+            incident=incident,
+            playbook=decision.playbook,
+        )
+
+        logger.info(
+            "auto_repair_result",
+            incident_id=incident_id,
+            success=result.success if result else False,
+        )
+
+        # 通知 Telegram 自動修復結果
+        if result:
+            try:
+                telegram = get_telegram_gateway()
+                status_icon = "✅" if result.success else "❌"
+                steps_summary = "\n".join(f"  • {s}" for s in result.executed_steps[:3]) or "-"
+                await telegram.send_message(
+                    f"{status_icon} *自動修復{'完成' if result.success else '失敗'}*\n"
+                    f"資源: `{target_resource}` ({namespace})\n"
+                    f"告警: {alert_type}\n"
+                    f"耗時: {result.execution_time_ms}ms\n"
+                    f"步驟:\n{steps_summary}"
+                )
+            except Exception as tg_err:
+                logger.warning("auto_repair_telegram_notify_failed", error=str(tg_err))
+
+    except Exception as e:
+        logger.exception(
+            "auto_repair_background_failed",
+            incident_id=incident_id,
+            error=str(e),
+        )
+
+
 # =============================================================================
 # Phase 5: Telegram 背景推送任務 (非阻塞)
 # =============================================================================
@@ -1113,7 +1197,7 @@ async def alertmanager_webhook(
             # ================================================================
             # Incident-Approval 同步 (鐵律: 必須同時創建)
             # ================================================================
-            await create_incident_for_approval(
+            incident_id = await create_incident_for_approval(
                 approval_id=str(approval.id),
                 risk_level=risk_level.value,
                 target_resource=target_resource,
@@ -1128,6 +1212,20 @@ async def alertmanager_webhook(
             primary_responsibility = analysis_result.primary_responsibility or "COLLAB"
             confidence = analysis_result.confidence
 
+            # ================================================================
+            # 2026-04-05 ogt: 自動修復評估 (ADR-058 閉環)
+            # Incident 建立後立即評估是否可自動修復
+            # P2 以下 + 高品質 Playbook + 低風險 → 背景自動執行
+            # ================================================================
+            background_tasks.add_task(
+                _try_auto_repair_background,
+                incident_id=incident_id,
+                approval_id=str(approval.id),
+                alert_type=alert_type,
+                target_resource=target_resource,
+                namespace=namespace,
+            )
+
             # 推送 Telegram
             background_tasks.add_task(
                 _push_to_telegram_background,

apps/api/src/models/playbook.py

@@ -237,13 +237,16 @@ class Playbook(BaseModel):
 
         條件:
         - 狀態為 APPROVED
-        - 成功率 >= 95%
-        - 成功次數 >= 10
+        - 成功率 >= 80% (冷啟動期: 原 95%，2026-04-05 ogt 降低以打破零執行惡性循環)
+        - 成功次數 >= 3  (冷啟動期: 原 10，累積足夠後再收緊)
+
+        待成熟後收緊為: success_rate >= 0.95, success_count >= 10
         """
+        # 2026-04-05 ogt: 冷啟動調整，打破 zero-execution 惡性循環
         return (
             self.status == PlaybookStatus.APPROVED
-            and self.success_rate >= 0.95
-            and self.success_count >= 10
+            and self.success_rate >= 0.80
+            and self.success_count >= 3
         )
 
     @property

apps/api/tests/test_auto_repair_service.py

@@ -189,7 +189,7 @@ class TestAutoRepairService:
                 affected_services=["test-service"],
             ),
             repair_steps=[],
-            success_count=5,  # < 10
+            success_count=2,  # < 3 (冷啟動門檻 2026-04-05)
             failure_count=0,
         )
         mock_playbook_service.add_playbook(playbook)