Traffic shifting proves nothing for nightly batch jobs. What replaces the canary for those rollouts?

For scheduled and stateful workloads the exposure unit is records and time, not requests: shadow runs on real input, row-level diff budgets, checkpoint compatibility, one-cycle warm standby.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

For scheduled and stateful workloads the exposure unit is records and time, not requests: shadow runs on real input, row-level diff budgets, checkpoint compatibility, one-cycle warm standby.

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