InfluxDB Week in Review - September 28, 2015` InfluxDB was used by Didi Kuaidi, a Chinese ride-hailing company with over 100 million users, to manage its thousands of servers and maintain service availability. InfluxDB also powered KNXMonitor, a cloud-based remote debugging and monitoring system for KNX installations. The influxdb-java client library now supports InfluxDB 0.9.x, and users can calculate the derivative of a sum using continuous queries. To celebrate its community support, InfluxDB offered free hoodies to companies with production-ready apps or products built on top of InfluxDB.