FreeBSD linprocfs and linsysfs compatibility

[raybellis]

FreeBSD contains optional linprocfs and linsysfs modules that provides a subset of the equivalent Linux pseudo-filesystems. They are usually mounted in /compat/linux/proc and /compat/linux/sys.

It would be great if this module were able to detect these and support that subset of the functionality!

Without them, other Prometheus code such as the Process module from client_golang don't work, although to an extent they can be fooled by mounting the Linux pseudo-FSs into (for example) /proc instead of /compat/linux/proc.

[discordianfish]

Interesting.. seems like a reasonable feature request.

[conallob]

I run FreeBSD, I'd be interested in investigating this further

[discordianfish]

@conallob go for it!