Measure CPU load

[mickel8]

The task is to add a new metric - CPU load in time.

CPU load should be measured for each core every x miliseconds where x is configurable.
At the end, there should be average cpu load calculated, also for each core.

• - measure cpu load every x miliseconds for each cpu core
• - calculate avg cpu load for each cpu core
• - make x configurable
• - create one plot - cpu load x time

Useful links and tips:

• one way to measure cpu load in linux systems is to read /proc/stat file
• support for Windows is not in the scope of this task
• https://github.com/mickel8/system_info
• https://www.erlang.org/doc/man/scheduler.html
• https://www.erlang.org/doc/man/erlang.html#statistics_scheduler_wall_time
• https://hamidreza-s.github.io/erlang/scheduling/real-time/preemptive/migration/2016/02/09/erlang-scheduler-details.html
• https://s3.us-east-2.amazonaws.com/ferd.erlang-in-anger/text.v1.1.0.pdf