A pottery-glaze camera already serves the studio. Testers want the new model to see the same live frames without changing what the kiln board is told. What should they name that activity, and how does it differ from a canary?

The new glaze model sees the same live frames without changing what the kiln board is told. That is shadow testing: parallel, same requests, no effect on live responses, useful for spotting regressions or drift before cutover. A canary answers for a live slice. Rollback and a clerk’s-phone-only check are different deploy-path jobs.