I don’t know about a julia library to do it.
I’ve done it with the psutil
python library.
You can use the Conda package (or PyCall I guess) to do it. Example
julia> using Conda
julia> Conda.add("psutil")
julia> aux = py"""import psutil
def get_cpu():
return psutil.cpu_percent()
"""
julia> py"get_cpu()"
11.3
julia> x = py"get_cpu()"
8.1
julia> typeof(x)
Float64