[xg15]

No idea if this is done, but couldn't you in theory add the instrumentation before or during the compilation?

Something like a tool that runs as part of the build process and modifies the source code before it gets passed to the compiler.

[kimi]

I'll take mature instrumentation that comes in the box and is a major design goal, meant to be transparently run in production (JVM, BEAM...) against anything you can do in Go.