System usages metrics

[GoutamVerma]

Hello Mentors,

I have exposed metrics for almost all functions as we can see in the text file I attached below.

But I am not pretty sure about "how to export system usages metrics"(i.e. available ram, rom and networks) and I didn't find any documentation regarding this.
Is there any help or comments regarding export of "System usages metrics"

exposed metrics.txt