Go has pprof (https://github.com/google/pprof), which I've heard good things about --- and, the pprof data model was one of the influences I looked at when designing the Tokio console's wire format. But, I'm not sure if pprof has any similar UIs to the one we've implemented for the Tokio console; and I haven't actually used it all that much.

pprof + runtime tracing spans is probably the best equivalent in Go-land, yeah. I have yet to see any library actually use those, but that may just be me being unlucky.

Already mentioned: https://pkg.go.dev/net/http/pprof

I've just seen that Goland (the IDE) has some nice integration:

https://blog.jetbrains.com/go/2020/03/03/how-to-find-gorouti...

Is there even something like this for Python?

I've used Tracy for C++, which does similar tracing on OS-level threads, but I don't know much about Python.