K Young's article is the second in a series focused on monitoring Docker, specifically detailing the resource metrics available from Docker containers, which differ from traditional host metrics due to the container's operation within cgroups. The piece outlines key Docker resource metrics, including CPU, memory, I/O, and network, with specific attention to CPU throttling and memory utilization metrics such as resident set size (RSS) and cache memory. It emphasizes that some traditional host metrics are missing, like nice and idle CPU time, while offering insights into the unique metrics applicable to Docker containers. The article also previews the next installment in the series, which will explore three distinct methods for collecting Docker resource metrics, noting that the techniques differ from those used in traditional hosts.