This document provides an overview of Graphite and StatsD. StatsD is a network daemon that listens for statistics like counters or timers over UDP and sends them to Carbon. Carbon is another network daemon that listens for statistics over TCP and stores them on disk using Whisper, a fixed-size database like RRD. Graphite is a web-based interface for visualizing the stored metrics, allowing users to render graphs and create dashboards from the collected time-series data.