[ruby-core:113770] [Ruby master Feature#19056] Introduce `Fiber.annotation` for attaching messages to fibers.

Issue #19056 has been updated by ioquatix (Samuel Williams).


I understand your concerns.

Every production system I've worked on has some kind of APM, and I've never heard anyone complain about the overhead - it's usually minuscule in comparison to the actual work being done.

I'm fine for it to be a gem, but it will limit the application to core libraries. Careful application of such a feature can be incredibly helpful for debugging.

One way to mitigate the performance is to use things like `prepend` to inject annotations to existing code. But it's clunky at best.

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Feature #19056: Introduce `Fiber.annotation` for attaching messages to fibers.
https://bugs.ruby-lang.org/issues/19056#change-103420

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
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It's useful to know what a fiber is doing especially when they have a temporal execution (i.e. sockets connecting vs connected, binding vs accepting, queue popping, etc)

Let's introduce `Fiber.annotate` and `Fiber#annotation` for logging a short message attached to Fibers.

```ruby
Fiber.annotate "Counting to 10"
10.times{|I| puts I}

# Fiber.current.annotation => "Counting to 10"
```

Pull Request: https://github.com/ruby/ruby/pull/6554

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