Question

我想根据一条规则来提醒普罗米修斯，该规则用简单的英语会读到类似的内容

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满足此规则的要求是测量以1分钟为间隔的连续数据点的下降，如果任何数据点的下降超过或等于5％，我们将发送警报。

我正在结合使用不同的记录规则来实现这一目标。我要使用的算法如下

alert if metric X has dropped once by 5% in the last 5 minutes.

如何编写第二条记录规则？我已经尝试过clip_max / min。但是我不认为那是我想要的。对我有帮助的是promQL中的if / else构造。没有时间序列查询的经验也无济于事。非常感谢您提供任何帮助。

Answer 1

这应该有效：

record: metricX:idelta_ratio
expr: ((idelta(metricX{job="A"}[2m]) / (metricX{job="A"} offset 1m)) * 100)

record: metricX:idelta_ratio_le-5
expr: metricX:idelta_ratio <= bool -5

alert: MetricXDroppedBy5Percent
expr: sum_over_time(metricX:idelta_ratio_le-5[5m]) > 0
...

但是请注意，Prometheus不保证您的指标每分钟精确收集一次。或者您的规则每分钟精确评估一次。而且您正在对规则中的1m和2m范围进行硬编码，如果您的抓取时间间隔发生变化，则可能会以有趣的方式误操作。

计算移动时间窗口中连续点之间百分比下降的发生

1 个答案: