Drop label for single metric only, not for entire scrape job

[Peter Burrows]

Hi folks, I have a scenario where I wish to drop label L from metric A. I easily found documentation on how to drop label L from all metrics within a job, however in my case I have another metric we'll call B that's in the same scrape job and for metric B label L is useful and shouldn't be dropped. I've been unable to find anything online to help with such a scenario. I basically want to drop a label for a specific metric but leave it in place for all other metrics in the same job. Is anyone aware of a way to achieve this, perhaps with metric_relabel_configs?

[Julien Pivotto]

On 25 Feb 03:47, 'Peter Burrows' via Prometheus Users wrote:
> Hi folks, I have a scenario where I wish to drop label *L* from metric *A*.
> I easily found documentation on how to drop label *L* from all metrics
> within a job, however in my case I have another metric we'll call *B*
> that's in the same scrape job and for metric *B* label *L* is useful and

> shouldn't be dropped. I've been unable to find anything online to help with
> such a scenario. I basically want to drop a label for a specific metric but
> leave it in place for all other metrics in the same job. Is anyone aware of
> a way to achieve this, perhaps with metric_relabel_configs?

You can do:

metric_relabel_configs:
- source_labels: [__name__,L]
target_label: L
replacement: ""
regex: 'A,.*'

Regards

>
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--
Julien Pivotto
@roidelapluie

[Brian Candler]

> regex: 'A,.*'

I think semicolon rather than comma?

[Peter Burrows]

metric_relabel_configs:
  - source_labels: [__name__,L]
    separator: ;
    action: replace
    regex: "A;.*"
    replacement: ""
    target_label: L

The above worked perfectly for me, thanks both for the help.