能重点标识网站流量的意外激增或下降的内置功能叫什么？

Anomaly Detection is the correct answer because it is a built-in Google Analytics feature specifically designed to identify statistically significant deviations (spikes or drops) in your website's traffic data. It uses historical data and statistical modeling to determine what constitutes "normal" behavior and then flags data points that fall outside these expected ranges. This helps you quickly spot unexpected changes that might indicate a problem (like a tracking error or server issue) or an opportunity (like a successful marketing campaign). Machine Learning and Google AI are broader categories of technology that Anomaly Detection utilizes, but they are not the specific feature name. Data-driven attribution is a model for assigning credit to touchpoints in a conversion path, unrelated to identifying traffic anomalies.