Replay

A controlled experiment that re-runs a captured workload shape against candidate execution profiles to compare cost, latency, and capture.

Replay is how BYOC and routing changes are justified before they ship. A replay run pins inputs, alias releases, and workload shape, then compares a baseline against a candidate and emits a signed report.

It turns "this should be cheaper" into "this was 18% cheaper on the same traffic," which is the bar for moving a lane.

See it in practice.

Definitions are useful; measurement is better. Run a diagnostic on your own workload.