How to calculate the difference of a value over time with InfluxDB and Grafana
Learning about the past helps us understand the present, and even predict the future. So, whether you are monitoring CPU usage or how long your IoT device was powered on and then off, at some point, you might want to know the difference of a value over time. InfluxDB is an open source database for storing and retrieving time series data. Thanks to its own query languages — flux and InfluxQL — it provides different and powerful ways to analyze data.