[conradludgate]

> zero modifications

Highly depends on the language or framework. I used to use NewRelic APM with Go and it required additional code to instrument.

All languages I have used in production require manual instrumentation. For that tracing and logging both work well in my experience.

[lmm]

> I used to use NewRelic APM with Go and it required additional code to instrument.

I'm not surprised, Go's runtime is pretty limited. But for e.g. Java if you're using a well-known/"standard" framework you can just flick the switch and it'll give you a lot of good useful information - additional manual instrumentation usually helps, but the level of instrumentation without it is useful.