Aug 19, 2026 · Operations

Why Prometheus Metrics Have High Cardinality and How to Fix It

The article explains why Prometheus metric cardinality explodes, how it impacts memory, storage and query performance, and provides a step‑by‑step troubleshooting guide with concrete examples, code snippets, mitigation strategies, validation methods, and best‑practice recommendations for SREs.

AlertingPrometheusTSDB

0 likes · 24 min read

Why Prometheus Metrics Have High Cardinality and How to Fix It

Random Bulletin

Aug 14, 2026 · Operations

Why Metric Counts Explode from Thousands to Millions in High‑QPS Systems

A single high‑cardinality label can cause a monitoring system to crash as metric series jump from hundreds of thousands to millions, overwhelming storage, queries, collection, cost, and signal‑to‑noise; the article explains the root cause, impact dimensions, and practical mitigation strategies such as cardinality control, distributed TSDBs, downsampling, pre‑aggregation, and proper division of metrics, traces, and logs.

PrometheusTSDBhigh cardinality

0 likes · 17 min read

Why Metric Counts Explode from Thousands to Millions in High‑QPS Systems