When AI ships code faster than anyone can review it, velocity metrics go vertical, and code drifts rapidly and silently from the original intent, accumulating problems and vulnerabilities in its wake. The Production Drift Ratio is the first metric designed to make that cost visible.
TL;DR
Drift is defined as the silent and accumulating gap between design intent and code output.
AI-assisted development creates code drift faster and at greater volume than human review can catch.
Standard velocity metrics (story points, PRs, time-to-merge) do not measure drift.
