[BTS-2166] Create async registry metrics during feature prepare #21834
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…e when the Scheduler starts
dothebart
approved these changes
Jul 1, 2025
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Scope & Purpose
TSan tests found a race between a scheduler worker thread reading the thread registry's metrics, and the metrics being set in the first place during
async_registry::Feature::start().This PR moves the creation of the metrics to
prepare(), so they are set before the scheduler starts.Checklist
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