September 2020
Intermediate to advanced
526 pages
8h 23m
Chinese
book
Google SRE工作手册
by Betsy Beyer, Niall Richard Murphy, David K. Rensin, Kent Kawahara, Stephen Thorne
Content preview from Google SRE工作手册
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基于
SLO
的告警
｜
97
精确率（
precision
）
在所有检测到的事件中，确实是重大事件的比例是多少。如果每个告警都对应一
个重大事件，那精确率就是
100%
。请注意，告警可能会在低流量时段对非重大
事件变得特别敏感（详见本章“低流量服务和错误预算告警”一节）。
查全率（
recall
）
在所有客观存在的重大事件中，被我们检测到了的比例是多少。如果对每一个重
大事件都发出了告警，那么查全率就是
100%
。
检测用时
在各种条件下，发出告警通知需要多长时间。较长的检测用时会对错误预算产生
负面影响。
重置用时
在问题得到解决以后，告警还会持续多长时间。较长的重置时间可能导致混淆或
忽略问题。
重大事件告警方法
设定基于
SLO
的告警规则可能是很复杂的事情。在这里，我们提出了六种方法用于
设置重要问题的告警。我们的目的是提高质量，尽可能保证同时控制好精确率、查
全率、检测用时、重置用时这四个指标。以下的每种方法都解决了不同的问题，有
的方法最终会同时解决多个问题。如果前三个方式都不太适用的的话，继续尝试后
面的三个更适用的告警策略，第六种方法是最可行和我们最强烈推荐的方式。第一
种方法的实施简单，但是实效不足，然而最优化的方法应该是提供了一种完整的解
决方案，无论在长期还是短期来看，它都能有效地落实
SLO
。
为了便于讨论，“错误预算”和“错误率”
在这里适用于所有
SLI
，而不仅仅用于
名称中包含“错误”二字的
SLI
。在第
2
章的“面向
SLI
的度量”一节里，我们建议
使用
SLI
来刻画正常事件占所有事件的比例。错误预算指的是允许发生的问题事件 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.