On Monday, 16 May 2022 at 08:51:05 UTC+1 [email protected] wrote:
> metric_relabel_configs:
> - source_labels: [__name__]
> separator: ;
> regex: (istio_requests_total)
> replacement: $1
> action: drop
>
I think that should work, although "replacement" is superfluous here
(because it doesn't do anything with "drop" action), and "separator" is
also unnecessary (because semicolon is the default, and you're not joining
multiple labels anyway).
Did you tell prometheus to reload its config after changing this? Is it
under the correct scrape job? Does it produce any errors on reloading?
> ```
> But I tried this fairly straight forward metric_relabel_configs,
> "istio_requests_total" doesn't drop as expected. I know you may ask why I
> don't drop this in relabeling.
>
I don't understand that last sentence. Metric relabelling is the only
place you can drop individual metrics, post-scrape. Target relabelling can
only be used to drop entire targets, pre-scrape.
> My very first goal is to drop all the metrics with destination_service =
> unknown associated with istio like :
> ```
> - source_labels: [destination_service]
> separator: ;
> regex: ^unknown(.*)
> replacement: $1
> action: drop
>
For safety it's best to quote any strings which contain special characters,
just in case YAML decoding treats them specially. I don't think there's a
problem with what you've written, but I would use:
- source_labels: [destination_service]
regex: '^unknown(.*)'
action: drop
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