Prometheus查询以计算唯一标签值

问题描述

我想计算唯一标签值的数量.有点像

I want to count number of unique label values. Kind of like

select count (distinct a) from hello_info

例如，如果我的指标"hello_info"具有标签a和b.我想计算唯一的a的数量.在这里，对于a ="1"，"2"，"3"，计数将为3.

For example if my metric 'hello_info' has labels a and b. I want to count number of unique a's. Here the count would be 3 for a = "1", "2", "3".

hello_info(a="1", b="ddd")
hello_info(a="2", b="eee")
hello_info(a="1", b="fff")
hello_info(a="3", b="ggg")

推荐答案

count(count by (a) (hello_info))

首先，您需要一个聚合器，其结果的每个值为a，然后可以对其进行计数.

First you want an aggregator with a result per value of a, and then you can count them.

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