Graphite is a nice piece of software, but with an absurdly confusing architecture and setup. You have to setup 3 different applications (graphite, carbon and whisper) to have a working server, but you're on your on - there's no comprehensive documentation. Also, I have no idea why it ships with 4 different user interfaces, of which 3 are semi-broken, or why it doesn't adopt RRD as it's default storage (since it can read RRD files if you symlink them). It could be refactored to be only a REST interface for graphing and be just as useful.