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Infra2026-08-18 · source-backed
Traffic-tests splits live traffic across one control and up to 20 variants by percentage, re-sampling at the infrastructure layer rather than requiring a branch in application code. Variants carry zero weight in the base split so the experiment owns their allocation; optional sampling_key gives sticky per-user assignment; etag versioning guards concurrent config overwrites. Platform metrics free, product metrics joined by deployment ID from response metadata. Their argument: shadow traffic proves operational soundness but can never tell you which model users prefer.
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