How to use environment var GODEBUG

Question

Could someone please explain me how to use the environment variable GODEBUG ?

Maybe a link to a good tutorial

Google is not very helpful - or I don't know what to search for

Answer 1

The GODEBUG environment variable is documented in the runtime package.

Dave Cheney describes how to visualize GC using telemetry from GODEBUG=gctrace=1.