Prometheus PromQL: From Beginner to Expert
PromQL (Prometheus Query Language) is the query language of the Prometheus monitoring system and the core of the cloud-native monitoring stack. Whether you’re building Grafana dashboards, writing alerting rules, or running ad-hoc queries during incident troubleshooting, PromQL is indispensable. This article starts from the data model and progressively covers aggregation operations, common functions, practical queries, and advanced techniques like subqueries. Reference: Prometheus Official Documentation — Querying basics I. PromQL Data Model PromQL has four fundamental data types....