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Goal: stop losing carrier callbacks during peak shipping season by retrying failed webhooks with exponential backoff, with a kill switch.
1. Enable for staff accounts only. 2. 10% of production traffic. 3. 50%, then 100% if error budget holds.
Open questions: who owns the cleanup two weeks after 100%? [[anchor]]Do we keep the legacy retry path in process, and for how long?[[/anchor]]
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