drop label from metrics prometheus

Question

I have the metric below and I want to drop the label "exported_namespace="test" and I am using the prometheus relabel_config but I'm not sure if the config will work properly:

"kube_pod_status_ready{condition="false", env="test", exported_namespace="test", instance="10.69.19.17:8080", job="kube-state-metrics", namespace="test", pod="test-1-deploy", uid="1asdadasaas"}

prometheus scrape config

- source_labels = [exported_namesapce]
  separator: ,
  action: labeldrop
  regex: (.*)
  replacement: $1

Answer 1

Please note that you must use metric_relabel_configs instead of relabel_configs if you want apply relabeling on the collected metrics. See this article for details.

If you want to drop a label with a particular value from the collected metric, then use the following relabeling rule at metric_relabel_configs section of the needed scrape_config:

- source_labels: [exported_namespace]
  regex: test
  target_label: exported_namespace
  replacement: ""

This relabeling rule substitutes the exported_namespace="test" label with exported_namespace="" label, which, in turn, is automatically removed by Prometheus, since it contains an empty label value. You can play with this relabeling rule at this page.

If you need just dropping the exported_namespace label with any value, then use the following relabeling rule:

- action: labeldrop
  regex: exported_namespace

Note that this rule will drop any value for exported_namespace label. For example, both exported_namespace="test" and exported_namespace="foo" will be dropped.

Update: if you use vmagent, then you can use if filter for dropping label with the particular value. For example, the following rule drops only exported_namespace="test" label:

- if: '{exported_namespace="test"}'
  regex: exported_namespace
  action: labeldrop

See these docs for more information about if filter.