How to rename label within a metric in Prometheus

问题

I have a query:

node_systemd_unit_state{instance="server-01",job="node-exporters",name="kubelet.service",state="active"} 1

I want the label name being renamed (or replaced) to unit_name ONLY within the node_systemd_unit_state metric. So, desired result is:

node_systemd_unit_state{instance="server-01",job="node-exporters",unit_name="kubelet.service",state="active"} 1

There are many other metrics with a label name name in the node-exporters job. That's why I can't use relabel config across the job.

回答1:

You can have more than one source label, so:

- source_labels: [__name__, name]
  regex: "node_systemd_unit_state;(.+)"
  target_label: unit_name

If the label name isn't matching up with other metrics/exporters, you should file a bug with them. Relabelling like this should only be a temporary solution while a proper fix is being pursued.

回答2:

you can use the label_replace function in promQL, but it also add the label, don't replace it

label_replace(
  <vector_expr>, "<desired_label>", "$1", "<existing_label>", "(.+)"
)

label_replace(
node_systemd_unit_state{instance="server-01",job="node-exporters",name="kubelet.service",state="active"},
"unit_name","$1","name", "(.+)"
)

So, to avoid the repetition you can add:

sum(label_replace(
    node_systemd_unit_state{instance="server-01",job="node-exporters",name="kubelet.service",state="active"},
    "unit_name","$1","name", "(.+)"
    )
)by(unit_name)

来源：https://stackoverflow.com/questions/54235797/how-to-rename-label-within-a-metric-in-prometheus

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monitoring

Prometheus