mattttt

Graphite was the original, but as others have mentioned, Influx, Prom, Cloudwatch & Elasticsearch are all first-class data sources.

The latest versions of Grafana now have a pretty extensible plugin architecture, and the types of panels have been growing by the community at Grafana.net. We're even seeing some new contributions that use D3 instead of Flot, which is super exciting to me.

Full disclosure, I work for Grafana, but seemed relevant to mention.