[ruby-core:113769] [Ruby master Feature#19056] Introduce `Fiber.annotation` for attaching messages to fibers.

Issue #19056 has been updated by Eregon (Benoit Daloze).


Probably not, but I also think net-http shouldn't use it.
There is overhead to e.g. call Addrinfo#inspect (or #to_s) in your screenshot above.
Also for such logging to be useful one most likely needs string interpolation, which means string allocations even when the annotations are not used.
And non-Fiber users probably have little to no use for those annotations.

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Feature #19056: Introduce `Fiber.annotation` for attaching messages to fibers.
https://bugs.ruby-lang.org/issues/19056#change-103419

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
----------------------------------------
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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