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feat(heartbeat): noise reduction — silent 6h + warnings hash dedup
P0 #4 (徹底長期修系列) — 統帥鐵證：「INFO | AWOOOI 系統報告」每 30 分鐘
推一次，一天 48 條同樣內容，即使我修了 P0 #3 假警報，每天的「全系統正常」
重複推送本身就是噪音，讓統帥誤以為告警還在重複。
修法（不違反「監控工具必須被監控」鐵律 — 健康狀態仍每 6h 推 1 次「我活著」）:
| 狀況 | 推送行為 |
|------|---------|
| 健康（無 warnings）| 6h 內最多 1 次「我活著」訊號 |
| 有 warnings 跟上次同 hash | 跳過 |
| 有 warnings 跟上次不同 | 立即推送（新狀況不漏）|
| 健康 ↔ 有事 切換 | 自動清掉相反 marker |
Redis keys:
- `heartbeat:silent_last_sent` — 健康狀態 silent marker, TTL=6h
- `heartbeat:warnings_hash` — 上次 warnings 的 md5[:12], TTL=24h
效果：統帥每天從 48 條 heartbeat → ~4 條（健康狀態 4×6h），有事立即推。
Tests: 6 passed (test_heartbeat_dedup_p0_4.py)
- healthy_first_send_goes_through
- healthy_second_send_within_6h_skipped
- warnings_unchanged_skipped
- warnings_changed_pushes
- warnings_to_healthy_clears_warnings_hash
- healthy_to_warnings_clears_silent_marker
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-03 01:48:57 +08:00
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