On Thu, 26 May 2022 at 13:42, Javier Mendiara Cañardo <[email protected]>
wrote:
> Hi,
>
> I have an info metric with all possible tag values
> tag_info{tag="small"} 1
> tag_info{tag="medium"} 1
> tag_info{tag="big"} 1
> tag_info{tag="azure"} 1
> tag_info{tag="aws"} 1
>
> I have an info metric with a multi-value label called "tags", as a csv
> with commas envelope
> vm_info{name="AAAAA" tags=",big,azure,"} 1
> vm_info{name="BBBBB" tags=",big,aws,"} 1
> vm_info{name="CCCCC" tags=",small,aws,"} 1
>
> I want to get how many machines have that specific tag:
> {tag="big"} 2
> {tag="small"} 1
> {tag="azure"} 1
> {tag="aws"} 2
>
> The tags values are not known when coding the query
>
> Any hints? It's a kind-of label_split missing function.
>
I don't believe this is possible with PromQL in a general form. You can
figure out the value for a single known tag with a regex matcher, but not
in the general case. Such a function would also be a footgun, as it could
greatly increase the cardinality of the output relative to the input. As it
stands you can only increase input to output cardinality via
absent/absent_over_time, and that's only from 0 to 1.
Thanks!
>
> PD: I have under the control the exporter to make a metrics refactor.
>
This is what you'd need to do. You want a separate gauge metric with a
sample per tag present.
Brian
>
>
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>
--
Brian Brazil
www.robustperception.io
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