While using discourse in a multi-threaded Ruby implementation and server (TruffleRuby/Puma), errors are produced by the unsafe hash usage in the logster gem near this section:
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I see, any chance you can add a Mutex there in a PR? seems like the correct approach to fixing this.
(aside @dev-managers / @jomaxro I guess for parity with other projects we should keep logster issues enabled on github? my vote is yes)
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A post was split to a new topic: On which Discourse managed gems should we enable GitHub issues
If a Mutex is used, it should be used on both the write and read accesses for correctness.
This functionality feels like a better fit for fiber/thread-local variables though.
Is it possible to have multiple Logster::Logger instances, or is it always just one? If multiple we somehow need to make the instance’s object_id part of the key used for fiber/thread-local lookups.
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Absolutely! I think this should fix it and heavily simplify this code at the same time 
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Pretty sure there is only one, but I added some protections.
I opted out of using a define_finalizer consumers are responsible for clean up, otherwise the accounting gets very hairy.
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