Or separate the tags into individual labels:
vm_info{name="AAAAA",tag_big="1",tag_azure="1"} 1
On Thursday, 26 May 2022 at 13:51:43 UTC+1 Brian Brazil wrote:
> 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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