reporting internal telemetry from Tokio

[barkanido]

Hey folks.
Can Tokio repost internal telemetry about itself? I am looking for stuff runtimes usually report, minus, of course, memory and GC which are obviously of less importance.

Maybe the number of tasks, scheduler-related telemetry, etc?

[MikailBag]

Tokio has tracing integration. AFAIK this way you can get some information about running and waiting-to-run tasks.

[barkanido]

hmm, so to my understanding this is not meant for production instrumentation?

[Darksonn]

Using tracing in production is perfectly fine. It requires the unstable flag because future updates of Tokio 1.x are not guaranteed to be backwards compatible when it comes to this feature — in particular, future versions of Tokio may require a newer version of tracing.

[barkanido]

I see! is there documentation of what becomes visible and how when this flag is set?

[Darksonn]

I'm pretty sure it doesn't add any new methods, but it will cause Tokio to emit a log message to tracing in various cases.

[davidbarsky]

I'm pretty sure it doesn't add any new methods, but it will cause Tokio to emit a log message to tracing in various cases.

That is correct.