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7cd53c0228
fix(monitoring): 記憶體告警改用 working_set，停止 page cache 假告警
- alerts-unified.yml:
- SentryClickHouseMemoryPressure: usage_bytes → working_set_bytes，0.8 → 0.85
- GiteaMemoryPressure: 同步修正（同樣 page cache 虛高根因）
- ops/monitoring/tests/clickhouse_memory_test.yml: promtool 4 cases
- 04-awoooi-devops-commander.md v2.8: Prometheus 指標選擇規範 + Gitea HMAC Webhook 規範
- LOGBOOK: 記錄 T0 五大並行任務（A 按鈕 / B ClickHouse / C Gitea webhook / D ElephantAlpha / F Code review）
鐵證: 2026-04-23 23:13 sentry-clickhouse usage_bytes=88.5% vs working_set=7.8%
根因: container_memory_usage_bytes 含 OS page cache，OOM killer 不視為壓力
修法: 改用 K8s/cadvisor 認可的 working_set_bytes (RSS + active cache)，閾值 0.85
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-26 20:16:12 +08:00
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