Prometheus multiple source label in relabel config-CodePudding

For some reason, my Pod in k8s could possibly labeled with syscode or cib_syscode, how can I relabel both of them to cib_syscode? That is to say if pod labeled with one of them, choose its label value as the result. I have tried as follow, but it doesn't work because the target_label is duplicate.

    - job_name: ncr
      honor_labels: true
      scrape_interval: 30s
      scrape_timeout: 30s
      metrics_path: /metrics
      scheme: http
      kubernetes_sd_configs:
      - role: pod
      relabel_configs:
      - source_labels: [__meta_kubernetes_pod_label_syscode]
        separator: ;
        regex: (.*)
        target_label: cib_syscode
        replacement: ${1}
        action: replace
      - source_labels: [__meta_kubernetes_pod_label_cib_syscode]
        separator: ;
        regex: (.*)
        target_label: cib_syscode
        replacement: ${1}
        action: replace

Looking forward to your reply, thank you!

CodePudding user response：

Try the following:

    - job_name: ncr
      honor_labels: true
      scrape_interval: 30s
      scrape_timeout: 30s
      metrics_path: /metrics
      scheme: http
      kubernetes_sd_configs:
      - role: pod
      relabel_configs:
      - source_labels: [__meta_kubernetes_pod_label_syscode, __meta_kubernetes_pod_label_cib_syscode]
        separator: ;
        regex: ([^;] )
        target_label: cib_syscode
        replacement: ${1}
        action: replace

If either __meta_kubernetes_pod_label_syscode or __meta_kubernetes_pod_label_cib_syscode is set, then the regex should select its value (i.e. a continuous string not containing the separator ;) and assign it to the cib_syscode target label.

CodePudding user response：

Found this while fixing the same issue. The answer by weibeld is correct by design, but unfortunately that regexp replacement doesn't work (Prometheus 1.20). This one does:

relabel_configs:
  - source_labels: [__meta_kubernetes_pod_label_syscode, __meta_kubernetes_pod_label_cib_syscode]
    separator: ;
    regex: '((.*);(.*))'
    target_label: cib_syscode
    replacement: '$2$3'
    action: replace