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Per Riot Games engineering blog, GUARDRAIL METRICS in live experiments are which?
AWalls in the level layout for new players only
BMetrics that must NOT regress while primary improves
CTutorial videos shown when player gets stuck
DUI tooltips shown right after a user error
Answer & Solution
Correct answer: B. Metrics that must NOT regress while primary improves
Riot + Microsoft Experimentation: e.g. boost monetisation but watch D7 retention as guardrail. Ship only if guardrails stay flat.
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