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Review 盲點 5: alert_rule_catalog 68 筆但 noise_rate/TP/FP/last_fired_at 全 NULL
新增 rule_stats_updater_job.py (~170 行):
每 1h UPDATE 全表 alert_rule_catalog,從 incidents + approval_records 推算:
- last_fired_at = max(incidents.created_at WHERE alertname=rule_name)
- true_positive_count = count incidents.status='RESOLVED' past 30d
- false_positive_count = count approval_records.status='EXPIRED' past 30d
(EXPIRED = 48h 無人處理,視為假警報 proxy)
- noise_rate = fp / (tp + fp)
窗口: 30 天 (可配置)
使用單一 UPDATE + subquery,避免 N+1 (68 rule × 3 query = 204 queries → 1 query)
解鎖 E3 Hermes:
後續 Hermes AI agent 讀 alert_rule_catalog WHERE noise_rate > 0.5
提案 review_status='deprecated' 或 superseded_by_rule_id
Wire main.py lifespan asyncio.create_task()
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>