Looking up a sysctl oid

[Dhananjay Balan]

What is the recomended way to understand what a sysctl oid represents?

for eg. How can I find what following oid represents?

dev.cpu.1.cx_usage: 18.07% 12.15% 69.76% last 1052us

so far I've found info about a subset of OIDs in manuals of sysctl(3)
and sysctl(8), also in src/sysctl.h, but no method to lookup
documentaion particular for an oid.

Thanks,
dbalan