On Fri, 27 May 2022 at 05:44, Javier Mendiara Cañardo <[email protected]>
wrote:
> Thank you Brians for your responses!
> I was hopping this problem could be solved with some dark magic promQL
> queries. I'd probably go with the vm_tag solution, as it is a general
> purpose metric that allows queries with group_right vector matching,
> solving more use cases around "tagging".
>
>
> FYI:
> To give you some context about why I chose
> vm_info{name="AAAAA" tags=",big,azure,"} 1
>
> is inspiration in prometheus code itself, in the ec2 service discovery
> code (and others)
>
> https://github.com/prometheus/prometheus/blob/1a6c2283a3e37f5ef6e0df78b72e67d3b2995a56/discovery/aws/ec2.go#L307-L310
>
> So it seems this "tagging" pattern is already in the community, but
> unfortunately does not solves all use cases by itself.
>
That's designed for relabelling when you're matching against one known tag
for service discovery, but not really beyond that.
Brian
>
> Best!
> Javier
> El jueves, 26 de mayo de 2022 a las 18:08:01 UTC+2, Brian Candler escribió:
>
>> ... although that doesn't help you with your count-by-arbitrary-tag
>> problem, sorry. For that as Brian B says, you need separate series:
>>
>> vm_tag{name="AAAAA",tag="big"} 1
>> vm_tag{name="AAAAA",tag="azure"} 1
>>
>> On Thursday, 26 May 2022 at 16:57:41 UTC+1 Brian Candler wrote:
>>
>>> 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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>>>>> To view this discussion on the web visit
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>>>>> <https://groups.google.com/d/msgid/prometheus-users/885bc38a-9950-4100-a247-68d1e52f17e7n%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>>> .
>>>>>
>>>>
>>>>
>>>> --
>>>> Brian Brazil
>>>> www.robustperception.io
>>>>
>>> --
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>
--
Brian Brazil
www.robustperception.io
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