问题

max_over_time(cbnode_systemstats_cpu_utilization_rate{instance=node}[6h])

max_over_time(cbnode_systemstats_cpu_utilization_rate{instance="a",node="a"}[6h])

max_over_time(cbnode_systemstats_cpu_utilization_rate{instance = node}[6h])

答案1

得分: 1

没有简洁的方法来做到这一点。

但是你可以利用 label_replace，标签匹配的逻辑进行二进制操作，再加上一点创造力。

label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "instance", "(.*)")
== label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "node", "(.*)")

在这里，我们向左边的指标添加了一个名为 pseudoid 的新标签，其值为 instance，右边也是一样，但值为 node。

只有当所有标签都相同时才会返回结果，这意味着 instance == pseudoid == node。

类似查询的演示可以在这里看到。

请注意，因为这不是即时向量选择器，你需要使用子查询语法将其传递给 max_over_time。

你的最终查询应该如下所示：

max_over_time(
 (
   label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "instance", "(.*)")
     == label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "node", "(.*)")
 )[6h:]
)

<details>
<summary>英文:</summary>

There is no easy elegant way to do that. 

But you can utilize `label_replace`, logic of label matching for binary operations and a pinch of ingenuity.

label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "instance", "(.)")
== label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "node", "(.)")

Here we add to LHS metric new label called `pseudoid` with value of `instance`, and same for RHS, but with value of `node`.

Result will be returned only if all labels are the same, and in turn it will mean that `instance == pseudoid == node`.

Demo of similar query can be seen [here][1].

Notice that since it is not the instant vector selector, you'll need to use subquery syntax to pass it into `max_over_time`.

You resulting query should look like this:

max_over_time(
(
label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "instance", "(.)")
== label_replace(cbnode_systemstats_cpu_utilization_rate{}, "pseudoid", "$1", "node", "(.)")
)[6h:]
)

  [1]: https://prometheus.demo.do.prometheus.io/graph?g0.expr=go_build_info%7B%7D&g0.tab=1&g0.stacked=0&g0.range_input=1h&g1.expr=label_replace(go_build_info%7B%7D%2C%20%22id%22%2C%20%22%241%22%2C%20%22path%22%2C%20%22(.*)%22)%20%3D%3D%20label_replace(go_build_info%7B%7D%2C%20%22id%22%2C%20%22%241%22%2C%20%22version%22%2C%20%22(.*)%22)&g1.tab=1&g1.stacked=0&g1.range_input=1h

</details>