Grafana

Grafana is a visualization and dashboarding platform. It queries data sources - Prometheus, Loki, PostgreSQL, and many others - and renders the results as panels arranged on a dashboard. The product's longevity comes from that separation: Grafana does not store most of the data it displays, it queries systems that do. The query model is per-panel. A panel selects a data source, runs a query, and applies a visualization. Because data sources are pluggable, the same dashboard tool works across a metrics database, a log store, and a SQL database without moving data between them. Alerting is built on the same queries. A rule evaluates a query on a schedule and fires when a condition holds, which means an alert and the dashboard panel that motivated it are defined in the same language. The core is open source and self-hostable, and the hosted service is the commercial layer.