# Operations and Monitoring

## 모니터링 목표
- source freshness
- quota consumption
- entity resolution precision drift
- overlay coverage ratio
- overlay contribution stability

## 핵심 메트릭
### source health
- `overlay_source_success_rate`
- `overlay_source_last_success_ts`
- `overlay_source_latency_seconds`
- `overlay_source_quota_remaining`

### pipeline health
- `overlay_records_generated_count`
- `overlay_records_missing_source_ratio`
- `overlay_degraded_mode_count`
- `overlay_review_queue_size`

### quality
- `entity_match_precision_sampled`
- `headline_dedupe_rate`
- `youtube_false_positive_rate_sampled`
- `wiki_map_missing_ratio`

### strategy impact
- `overlay_on_vs_off_delta_return`
- `overlay_on_vs_off_delta_sharpe`
- `overlay_hold_extension_hit_rate`
- `overlay_add_on_hit_rate`

## 알림 규칙
- source freshness SLA 초과
- YouTube quota 80% 초과
- review queue backlog threshold 초과
- overlay coverage ratio 급락
- overlay contribution delta 급변

## degraded mode
### trigger
- critical source 2개 이상 실패
- entity matcher precision alarm
- stale overlay snapshot

### behavior
- core-only mode로 전환
- overlay-based add-on 금지
- hold extension 비활성화
- alert 발송

## 운영 점검 루틴
### 일간
- 실패한 source job 확인
- overlay coverage 확인
- review queue triage

### 주간
- source별 precision 샘플 검수
- weight calibration 검토
- channel registry 변경점 반영

### 월간
- source keep/drop review
- topic map refresh
- schema/version audit
