[ruby-core:113767] [Ruby master Feature#19056] Introduce `Fiber.annotation` for attaching messages to fibers.

["Eregon (Benoit Daloze) via ruby-core" <ruby-core@ml.ruby-lang.org>]

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


Why not use a fiber-local variable for this? Then there is much less risk of conflict between libraries, and of course you can define convenience methods as you like.
Or as you implemented it in that gem, as an attribute + `annotate(message) { ... }`.

IMO this is good to be in a gem. I don't think it needs to be in core.

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Feature #19056: Introduce `Fiber.annotation` for attaching messages to fibers.
https://bugs.ruby-lang.org/issues/19056#change-103417

* 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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