CODEWITHSUNDEEP
prometheus
Aleksei Budiak
Aleksei Budiak

Reputation: 921

Use metric's value as a value of another metric's label

Is it possible to use the value of some metric as the value of label of another metric?

Let's say I have two metrics: metric_a and metric_b. metric_a also has some_label label. I'd like to make a query like the following:

metric_a{some_label=metric_b}

Upvotes: 1

Views: 3674

Answers (2)

Alin Sînpălean
Alin Sînpălean

Reputation: 10114

You can, although it's quite the hack:

metric_a and count_values without() ("some_label", metric_b)

The count_values function is going to essentially add a some_label label to your metric_b, equal to metric_b's value. The actual value is going to be 1, but you're not interested in that, just in constructing the right labelset to filter your metric_a by.

Also, you may need to pay attention to how you represent your value. E.g. there are more ways of representing the value 1 ("1", "1.0", "1e0" etc.) and count_values will only produce "1" as output.

Upvotes: 4

brian-brazil
brian-brazil

Reputation: 34172

You can't use metrics like that, however if you want to specify metric_a that shares a label value with metric_b you can do:

metric_a and on (some_label) metric_b

Upvotes: 4

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