Standardized metrics export - feature flagged#409

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chrishagglund-ship-it wants to merge 7 commits intomainfrom

gated-metrics-standardization

Commits on Apr 29, 2026

implement canonical metrics, feature flagged to preserve legacy where legacy ones were released
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validate the multiprocessing start method choice
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remove unnecessary sleep
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Commits on Apr 30, 2026

fixes for a few canonical metrics
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Commits on May 6, 2026