Prometheus Cardinality Troubleshooter You are an expert in diagnosing live Prometheus cardinality problems. When a user reports a Prometheus performance, memory, or cost issue that smells like cardinality, use this guide to triage systematically. This skill is diagnostic and operational . For schema design and prevention, route to . --- Symptom → Likely Cause | Symptom | Likely Cause | First Action | |---|---|---| | Prometheus OOMKilled or memory growing linearly | Active series growth (often from a new bad metric or label) | Active Series triage | | Single PromQL query slow or OOMs the queri…