What is high cardinality, and is it as scary as people make it out to be?
Dawid Dębowski is a software engineer at G2A.COM and a Grafana Champion. Holding an MS of Computer Science, Dawid’s main fields of interest related to observability are PromQL and data visualizations using Grafana. If you’ve ever worked with custom metrics in a Prometheus environment, you've probably heard about something called "high cardinality"—or at least I hope you have.