Prometheus Has a Free Monitoring Stack — Metrics, Alerts, and Dashboards for Any Infrastructure

Your server CPU spikes to 95% at 3am. Nobody notices until users complain at 9am. Six hours of degraded performance because you had no monitoring. Prometheus + Grafana is the industry-standard monitoring stack. Free, self-hosted, battle-tested at scale (Kubernetes, CloudFlare, DigitalOcean all use it). Set it up once and never be surprised by a server issue again. What You Get Free Apache 2.0 licensed: Time-series database — optimized for metrics (CPU, memory, requests, latency) Pull-based scraping — Prometheus pulls metrics from your services PromQL — powerful query language for metrics analysis Alertmanager — routing, silencing, grouping of alerts Service discovery — auto-discover targets in Docker, K8s, Consul, EC2 Exporters — 100+ ready-made exporters (Node, MySQL, Nginx, Redis, etc.) Federation — scale across multiple Prometheus servers Recording rules — pre-compute expensive queries Grafana integration — beautiful dashboards with PromQL data source Long-term storage — Thanos/Cort