Prometheus/PromQL 减去两个规范指标 [英] Prometheus/PromQL subtract two gauge metrics

问题描述

我有来自两个不同实例的这个仪表指标metric_awesome".我想要做的是，像这样从实例二中减去实例一

I have this gauge metric "metric_awesome" from two different instances. What i want to do, is subtract instance one from instance two like so

metric_awesome{instance="one"} - metric_awesome{instance="two"}

不幸的是，结果集是空的.有没有人经历过这个?

Unfortunately the result set is empty. Has anyone experienced this?

推荐答案

这里的问题是标签不匹配.你想要的是:

The issue here is that the labels don't match. What you want is:

metric_awesome{instance="one"} - ignoring(instance) metric_awesome{instance="two"}

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