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lens/troubleshooting/custom-prometheus.md

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Using Custom Prometheus

When using custom prometheus with Lens app, Lens expects certain things for prometheus rules and labels. Below is listed the changes required to see metrics properly.

kube-prometheus

  1. To see node metrics properly, please add
- action: replace
  regex: (.*)
  replacement: $1
  sourceLabels:
  - __meta_kubernetes_pod_node_name
  targetLabel: kubernetes_node

relabeling to node-exporter servicemonitor crd (for example kubectl edit -n monitoring servicemonitors node-exporter).

  1. To see cluster's pod usage on cluster overview properly, please add metricsRelabeling to kubelet service monitor (kubectl edit -n monitoring servicemonitors node-exporter)
metricRelabelings:
- action: replace
  sourceLabels:
  - node
  targetLabel: instance

Helm chart

  1. To see cpu metrics properly, please set value of server.global.scrape_timeout less than 1 minute, for example
helm upgrade --set server.global.scrape_timeout=30s prometheus stable/prometheus