Retrieves statistics of the system's activity (development doc)

 A lightweight library that retrieves statistics of the system's
 activity in a portable and thread safe way. In each OS that it
 supports it offers the same API for retrieving the activity of:
 .
  * hard disks
  * CPUs memory
  * processes
  * network interfaces.
 .
 This package contains the development API documentation. Non-developers
 likely have little use for this package.