Graphite is a free open-source software (FOSS) tool that monitors and graphs numeric time-series data. Graphite was originally a project developed internally at Orbitz in 2006, which eventually grew to be their foundational monitoring tool. In 2008, Orbitz allowed Graphite to be released under the open source Apache 2.0 license. Graphite made it possible to know more than simply if applications were up and running.