InfluxDB is an open source time series database with no external dependencies. It's useful for recording metrics, events, and performing analytics. Features: * Built-in HTTP API so you don't have to write any server side code to get up and running. * Data can be tagged, allowing very flexible querying. * SQL-like query language. * Simple to install and manage, and fast to get data in and out. * It aims to answer queries in real-time. That means every data point is indexed as it comes in and is immediately available in queries that should return in < 100ms.