How can I add static label to all metrics from a discovered service?

[Shaolin Zheng]

We can add new static label to static_configs like this:

static_configs:

- targets:

  - address1

  - address2

  labels:
    mynewlabel1: value

Now I want to add new label to targets that coming from service discovery. But seems like it only supports relabel_configs, which allow me to transfer any existing label, but not create a new label from zero.

Any suggestion how I can achieve that?

BTW my real problem is to add a cluster label to all the metrics from current Kubernetes cluster

[Brian Candler]

Relabeling allows creation of arbitrary labels.  This ought to work to set foo="bar" (untested)

      - source_labels: []

        target_label: foo

        replacement: bar

If for some reason source_labels cannot be an empty list, then use any other label which exists and its value will be ignored, e.g.

      - source_labels: [__address__]

        target_label: foo

        replacement: bar

[Shaolin Zheng]

Great, thanks