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The Shadow Run: How I Test a New Workflow Version on Live Traffic Without Firing Side Effects

This story is from 2026-10-14. It is preserved in the archive; the latest stories are on the live feed.

Fixtures prove the mechanism works. They don't prove the new version behaves the same on real traffic. The shadow run does: it replays live events through the new workflow version with every side effect stubbed out, then diffs "what v1 did" against "what v2 would have done." Here's the exact setup…

Read the full story at DEV Community — AI ↗

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  1. 2026-10-14 18:22 · DEV Community — AI
    The Shadow Run: How I Test a New Workflow Version on Live Traffic Without Firing Side Effects

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