To track the daily transaction volume for each customer in real time and send out a notification as soon as it detects volume outside a customer's normal range, the administrator should use a Streaming Insight paired with a Data Action.A Streaming Insight is a metric that is calculated on streaming data as it is ingested into Data Cloud, allowing near-real-time analysis of customer behavior. A Data Action is an action that is triggered by a Streaming Insight, such as sending an email, updating a record, or calling an API. By using these features, the administrator can monitor and respond to customer transactions in real time.