Charcoal is a simple Sinatra app designed to allow you to quickly put together a "dashboard" of system status images from Graphite, or any similar service that is capable of generating images directly from a URL (like the one in the examples, Placekitten).
It's a Sinatra app ready to deploy right to
Heroku. Just heroku create; git push heroku master to lock and load.
If you want to run it somewhere else, just make sure you've installed
the sinatra and haml gems.
The project includes a config.yml.example file, which you should
rename to config.yml. The format is documented in the config file
itself.