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Build useful golden signals for Kubernetes APIs without triggering Prometheus cardinality traps

Keep stable labels, measure latency that actually explains incidents, and stop ephemeral pods from turning your metrics into expensive noise.

A practical guide to traffic, latency, errors, and saturation for Kubernetes APIs without filling Prometheus with useless series or breaking alerts.

Created: April 26, 2026

Published: April 26, 2026

Estimated time35 min

LevelIntermediate

Before you startAccess to Prometheus and Grafana or their HTTP endpoints

PlatformsLinux / Docker

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Linux

Recommended when you operate Prometheus/Grafana against a real cluster and can use kubectl + curl from a Linux workstation.

kubectlcurljq

Open a temporary tunnel to Prometheus

kubectl -n observability port-forward svc/prometheus-operated 9090:9090

Inspect labels with too many values

curl -s http://127.0.0.1:9090/api/v1/status/tsdb | jq '.data.labelValueCountByLabelName | map(select(.name=="route" or .name=="pod" or .name=="session_id" or .name=="pod_uid" or .name=="http_target"))'

Also available inMontar golden signals útiles para APIs en Kubernetes sin disparar la cardinalidad de Prometheus

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