Product page · Revenue per visitor · stopped 3 h ago

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Stopped by a guardrailStopped automatically · 3 h ago

B pushes returns from 1.6% to 2.9% of orders.

Estimated increase of +78%. Even at the low end of its range (+25% → +130%), it exceeds the +25% tolerance set in the plan. Traffic went back to the original on Nov 10 at 5:12 AM, with no manual action.

Return rate: +1.2 pts; 1.6% → 2.9%
Relative increase: +78%; +25% → +130%
Plan tolerance: +25%; at most

View rollout

The stopping rule

1The guardrail is monitored continuously, with a range you can check at every look without raising false alarms.
2Traffic goes back to the original as soon as the entire range exceeds the tolerance. Degradation beyond +25% is then proven.
3The limit is set at launch and sealed with the plan, so it can’t change during the test. The guardrail involved is marked “Limit crossed” in the metrics table.

Stopped automatically on Nov 10 at 5:12 AM: a guardrail was crossed

B’s entire range moved past the limit chosen at launch, so the degradation is proven. The test is no longer served and all visitors see the original.

Guardrails

Return rate1.6% → 2.9% · limit +25% · range +25% → +130%Limit crossed

13 guardrail checks before the stop, each with an always-valid range.