Awesome! Thank you for the confirmation Brian Candler! On Friday, October 1, 2021 at 1:20:29 AM UTC-7 Brian Candler wrote:
> That's correct. The "replacement" for the *labelmap* action is the new > label *name*, and it defaults to $1 > > target_label is used for the *replace* action, and for that action the > "replacement" is the *value* of the new label being created. > > On Friday, 1 October 2021 at 04:59:56 UTC+1 [email protected] wrote: > >> Great question wheresh. I had the exact same question too. And I was >> extremely confused. >> >> I think (please someone correct me if I'm wrong) that the action >> *labelmap* actually creates a new set of labels, instead of relabeling >> the labels: >> >> * >> >> https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config >> >> <https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config>* >> * "labelmap: Match regex against all label names. Then copy the >> values of the matching labels to label names given by replacement..."* >> >> Also, I think that *labelmap* is not a replace action because all >> replace actions require a target_label: >> >> * >> >> https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config >> >> <https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config>* >> * # Label to which the resulting value is written in a replace >> action. * >> * # It is mandatory for replace actions. Regex capture groups are >> available. * >> * [ target_label: <labelname> ]* >> >> So I think it just creates a new set of labels. >> The default replacement is $1, and in the example what is being captured >> in "regex: __meta_kubernetes_service_label_(.+)" is the very last part. >> So this is what I think is happening: >> >> *Labels that were matched >> New Labels* >> _meta_kubernetes_service_label_somelabel1 -> somelabel1 >> _meta_kubernetes_service_label_somelabel2 -> somelabel2 >> _meta_kubernetes_service_label_somelabel3 -> somelabel3 >> _meta_kubernetes_service_label_somelabel4 -> somelabel4 >> _meta_kubernetes_service_label_somelabel5 -> somelabel5 >> >> Someone please either confirm that this is what is happening, or provide >> an explanation of what is actually happening. >> >> Thank you! >> >> On Tuesday, January 9, 2018 at 10:49:14 PM UTC-8 [email protected] >> wrote: >> >>> hi, I check the demo yml file and found this : >>> >>> - action: labelmap regex: __meta_kubernetes_service_label_(.+) - >>>> source_labels: [__meta_kubernetes_namespace] action: replace target_label: >>>> kubernetes_namespace >>> >>> seems no target_label to replace in the action labelmap . >>> then what happens to it ? >>> >>> 在 2017年5月3日星期三 UTC+8上午7:16:51，Julius Volz写道： >>>> >>>> "labelmap" maps a whole set of labels (that match a regex) over to the >>>> target labels. That's typically useful if you want to copy over a whole >>>> set >>>> of labels (like all starting with "__meta_kubernetes_service_label_") to >>>> the target's labels. For example: >>>> https://github.com/prometheus/prometheus/blob/86426c05669417cf1012fbc3a40fb7e0f5a8a101/documentation/examples/prometheus-kubernetes.yml#L113-L114 >>>> >>>> "replace" does a replacement of a single label only (possibly from >>>> multiple source labels). Thus you can't use "replace" to copy over an >>>> arbitrary number of labels (of which you possibly don't know all exact >>>> names), but only one per relabeling rule. >>>> >>> On Wed, May 3, 2017 at 12:57 AM, Cemalettin Koc <[email protected]> >>>> wrote: >>>> >>> I have some confusion regarding labelmap and replace usage in scrape >>>>> configuration. I think that they can be used for each other. >>>>> >>>>> 1. What is the difference between them? For which use cases they are >>>>> more suitable? >>>>> 2. "replace" is using "target_label" whereas "labelmap" is using >>>>> "replacement" for targeting. Why is not labelmap using "target_label" as >>>>> well? >>>>> >>>>> Thanks >>>>> >>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Prometheus Users" group. >>>>> >>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To post to this group, send email to [email protected]. >>>> >>>> >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/prometheus-users/37905bb7-539c-4f85-9231-2fe4849bde9a%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/prometheus-users/37905bb7-539c-4f85-9231-2fe4849bde9a%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/7228afe2-6c99-4160-805e-e60798144fe3n%40googlegroups.com.
