I want to implement console support into a runtime

[nothendev]

How would I do it? There does not seem to be any docs about doing that in this repo or anywhere else.

[hds]

Do you mean you want to implement console support for some other runtime that isn't Tokio?

[nothendev]

exactly

[hds]

There is currently no specification for the instrumentation present in Tokio.

To understand it, you can read the console-subscriber source code or the tokio source code.

I have also written about it a bit on my personal blog in the following posts:

• https://hegdenu.net/posts/tracing-tokio-tasks/
• https://hegdenu.net/posts/debugging-tokio-instrumentation/
• https://hegdenu.net/posts/tokio-waker-instrumentation/
• https://hegdenu.net/posts/tracing-tokio-resources/

Certainly, starting with tasks, the tokio source code is quite clear in the fields that are included for task spawning:

https://github.com/tokio-rs/tokio/blob/512e9decfb683d22f4a145459142542caa0894c9/tokio/src/util/trace.rs#L54-L79

Down below that is the same for spawning blocking tasks.

To complete task instrumentation, you need to also instrument waker operations. You can see the format of that trace event in the tokio source here:

https://github.com/tokio-rs/tokio/blob/512e9decfb683d22f4a145459142542caa0894c9/tokio/src/runtime/task/waker.rs#L45-L55