How to monitor Docker resource metrics

This article discusses the various resource metrics that can be obtained from Docker containers. These include CPU usage (including user and system time), memory usage (including resident set size, cache memory, swap space, page faults), I/O operations (both synchronous and asynchronous), and network traffic (volume, packets, errors, and dropped packets). While some metrics are similar to those found on traditional hosts, others are unique to containers, such as CPU throttling. The next article in the series will cover methods for collecting these Docker resource metrics.