Deployment Risk Panel: Should I Let This Rollout Take the Next Step?

The deployments page shows which version each environment serves. What it cannot tell you is whether the version in the standby slot will produce different decisions for the cases it hasn't seen yet.

The Deployment Risk panel addresses the moment during a *progressive* rollout: the rollout is at 25%, some real callers are on the challenger. Should you widen to 50%?

**The blast radius is arithmetic**: 'serving_pct' from 'runtime.traffic_splits' multiplied by recorded volume gives daily decisions on the challenger. The next step percentage multiplied by the same volume gives the increment. On a high-volume service, "25% to 50%" is moving six figures of daily decisions — the panel converts the percentage into the absolute number so the decision is made at the right scale.

**The AI step** calls 'POST /ai/review-diff' between champion and challenger versions only after the arithmetic is presented. Refuses if: rollout has ended, no champion/challenger pair, or diff is empty.

**Companion panel**: the Rollout Decision panel (retrospective) reads what happened after a rollout completes — the decisions made, drift measured, anomalies flagged.