labeldrop does not work as expected

[roman-vynar]

Prometheus 1.5.0 introduced labeldrop relabeling action. However, it does not work as expected.

The following config results in dropping all time series containing that label container_label_com_amazonaws_ecs_task_arn instead of just a single label:

    metric_relabel_configs
      - source_labels: [container_label_com_amazonaws_ecs_task_arn]
        action: labeldrop

This config does nothing to the time series and label when using something on matching regex:

    metric_relabel_configs
      - source_labels: [container_label_com_amazonaws_ecs_task_arn]
        regex: 'arn:.*'
        action: labeldrop

The same story when placing the above into relabel_configs.
How does it suppose to work?

Thanks.

[brian-brazil]

Source labels aren't relevant for label drop, it's applying to the label names.

It looks like you want a normal replace in this case.

[roman-vynar]

@brian-brazil thanks!

Nevermind, the syntax is:

      - regex: 'container_label_com_amazonaws_ecs_task_arn'
        action: labeldrop

[tcolgate]

To drop an individual label you can use replace with a replacement value of "". labeldrop is for bulk dropping of labels.

[lock]

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