This question evaluates a data scientist's competency in product analytics, causal inference, experimental design, and metric-definition for a notification feature that surfaces listings similar to items a user has viewed or saved, situated in the Analytics & Experimentation domain.

You work on a marketplace where buyers browse and purchase listings. The team is considering a new notification feature (push/email/in-app) that alerts users when new listings similar to items they've viewed or saved become available. The goal is to increase user engagement and conversion without causing notification fatigue or harming overall marketplace health.
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