DevOpsDays Taipei 2018 9/12 13:30~13:55 Track AAlgorithmic IT Operation
你的系統現在運作良好嗎？
你可能會先看監控(CPU、Disk …)？
user 說好才是好，user 說不好就是不好。
使用總時間與可用時間來衡量系統可用率
SLI算出來後，定立一個目標，目標稱為SLO
症狀發作
找出根因
解決根因
回復正常
拿 avalibiily 抓 Error Budget
定出 Ddaily Error threshold
超出每日可容許的量時發警告
固定 threshold / trending 的情況：中間的部份 is Normal?
Random Cut Forest
metrics 長像相似時。
Dynamic Time Warping
不只可做 RCA，還可做預測
AIOps：減少人工遺漏
SLO Monitoring：避免 alert noise過多
場外聊天室，歡迎在下方喇賽
血糖血壓血脂
例：運動後、飯後的指數會超出平時的正常值
有時候系統重開機，就無法找到root cause.就像犯案現場被破壞一樣。
如果系統掛掉，自動開台新的，把流量導過去，但是舊的 instance 保留著 debug, 也許是個可考慮的作法。不過這樣很燒錢…
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