Kubernetes introduced a new metric called Millicores, which measures CPU usage.

A Millicore represents a fraction of a CPU core, divided into 1000 units (milli = 1000). For example, if a node has 4 cores, its CPU capacity is represented as 4000m.

4 * 1000m = 4000m

If you are utilizing 1/10th of a single core, then you are utilizing 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.