Monitoring is not optional when running a Kubernetes cluster — it is mandatory. This article covers the design and setup of an open-source monitoring stack using Prometheus, Grafana, and AlertManager.
Monitoring Strategy
Define core metrics based on the USE Method (Utilization, Saturation, Errors) and RED Method (Rate, Errors, Duration).
Prometheus Setup
Implement automatic target discovery using ServiceMonitor and PodMonitor, and optimize query performance with Recording Rules.
Grafana Dashboards
Build actionable dashboards that surface the most critical cluster health signals at a glance.
Alert Management
Use AlertManager routing rules and inhibition strategies to reduce alert fatigue without missing critical issues.