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Linux Containers rely on control groups which not only track groups of processes, but also expose a lot of metrics about CPU, memory, and block I/O usage. We will see how to access those metrics, and how to obtain network usage metrics as well. This is relevant for “pure” LXC containers, as well as for Docker containers. Locate your control groups Control groups are exposed through a pseudo-filesystem. In recent distros, you should find this filesystem under /sys/fs/cgroup. Under that director...