Watcher, a commercial alerting and notification product, has been released as a public beta by Elasticsearch to enhance its capabilities by allowing users to automate monitoring and response actions based on real-time data changes. Unlike Elasticsearch, which requires continuous manual analysis, Watcher enables a "reactively proactive" approach by automatically monitoring data, notifying users of important events, and executing predefined actions, thereby freeing users to focus on other tasks. It introduces a set of APIs to manage "watches," which consist of triggers, inputs, conditions, and actions designed to monitor specific events, evaluate conditions, and execute actions like logging or sending notifications. This extensible system can handle a wide range of use cases, from simple to complex, and is integrated seamlessly with Elasticsearch to provide immediate value. Users are encouraged to register for the beta program, explore the online documentation, and provide feedback through a dedicated forum.