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promql_for_label_transformations.md

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Extract service name from pod label

  • Use Case

    We receive pod in almost all kubernetes metrics, it may be required sometimes to extract the service name from pod itself, if service name is not coming explicitly.

    pod label looks like this : user-service-23n4-98jh-34ub, we want

    service label to user-service extracted from pod

  • promql

    sum by (service)(label_replace(sum by (pod) (kube_pod_status_phase{cluster=~'$cluster.*', phase='Running'}), "service", "$1", "pod", "([-a-z]+)-.*"))

  • Explanation

    • label_replace used pod label after executing query accepted as first argument.
    • Applies regex on it, specified as last argument
    • Captures group specified as 3rd argument, here it is $1
    • Create a new label with key specified as 2nd argument("service") and assign captured group value to it