Design robust primary and guardrail metrics

I’ll design a concrete experiment setup for a generic new feature. Replace feature_use, crash, and complaint with your actual event names. Primary Metric Metric: 7-day feature retention rate. It measures the proportion of users who use the feature at least once during days 1–7 after their first exposure. This maps to long-term value because repeated use shortly after discovery is a strong leading indicator of habit formation and durable retention. Exact formula: Let a user’s…