Kubernetes has a new metric called Millicores that is used to measure CPU usage. It is a CPU core split into 1000 units (milli = 1000).
If you have 4 cores, then the CPU capacity of the node is 4000m.
4 * 1000m = 4000m
If you’re using 1⁄10 of a single core, then you are using 100m.
This was created as a more granular way to determine the usage of cores in a system where many applications might be using one core; it’s easier for humans to deal with whole numbers than fractions.