Evaluate an ads algorithm change

Your ads team has developed a new ad-ranking algorithm for feed delivery. The new algorithm is expected to improve ad relevance and monetization, but it may also hurt user experience, shift delivery toward a small set of advertisers, or create short-term gains that do not hold long term. How would you decide whether to launch this algorithm? In your answer, discuss: - the primary business objective and why a single metric such as CTR is insufficient - the experiment design, including randomization unit and rollout strategy - key success metrics and guardrail metrics for users, advertisers, and platform health - how to handle interference, auction effects, novelty effects, and delayed conversions - what segment analyses you would run across geography, device, advertiser size, or user cohorts - how you would proceed if offline model metrics and online experiment results disagree