Graphite is a highly scalable tool for collecting and storing metrics to analyze system performance and optimize costs. It provides a powerful UI for pulling, correlating, and manipulating collected data. Graphite is easy to scale through techniques like increasing storage, using multiple instances, and deduplicating data. It has no central configuration, allowing metrics to be collected from any source. Supporting tools like Collectd, Statsd, and various dashboards make Graphite a full-stack solution for monitoring system and application metrics.