Rebel Core is the open source division of Rebel Media. We build Prometheus exporters, Grafana dashboards and CI integrations for the stack we run ourselves — then publish all of it under Apache-2.0.
curl https://api.rebelcore.org/v1/minecraft/user?username=Notch{
"username": "Notch",
"uuid": "069a79f4-44e9-4726-a5be-fca90e38aaf5"
}What we build
Everything here started as something we needed running in production. Publishing it costs us nothing and saves someone else the same afternoon.
Purpose-built exporters in Go for the services we actually run — Jellyfin and Minecraft — each shipping a plain /metrics endpoint that drops into an existing Prometheus scrape config.
An exporter without a dashboard is homework. Our Grafana dashboards import as JSON and light up the moment your Prometheus starts scraping.
The largest online database of Minecraft user information — over 65 Million usernames, with UUIDs, name history, skins and capes — searchable on the site and queryable through the public API.
11 documented endpoints, no account and no API key needed to start. 60 requests a minute, JSON responses, and the whole user database behind it.
Every project is Apache-2.0 on GitHub. Issues, pull requests and forks are all welcome — several of these tools exist because someone else needed them first.
The unglamorous integrations that keep a pipeline honest, like paging the on-call engineer from Jenkins the moment a build breaks.
On GitHub
Exporters, a dashboard and a Jenkins plugin — every one of them free to use, fork and extend.
rebelcore/jellyfin_exporter
Prometheus exporter for Jellyfin. Scrapes your media server for library counts, active sessions, transcode load and user activity, and exposes it all on a standard /metrics endpoint.
docker run -d -p 9594:9594 \
-e JELLYFIN_BASE_URL=http://jellyfin:8096 \
-e JELLYFIN_API_KEY=<your-key> \
rebelcore/jellyfin_exporterrebelcore/jellyfin_grafana
A ready-made Grafana dashboard for the metrics the Jellyfin exporter produces. Import the JSON, point it at your Prometheus datasource and you have streaming, library and user panels out of the box.
Free public API
UUID lookups, name history, skins and capes across the biggest online database of Minecraft user information. 11 documented endpoints, JSON responses, and a rate limit generous enough to build on.
Open source
Browse the source, open an issue, or fork it and make it yours. That is rather the point.