What is a requirement for checking the success of a web application with RUM?

In the context of Real User Monitoring (RUM) for assessing the success of a web application, the presence of a specific script in the webpage source is essential. RUM operates by embedding a small JavaScript snippet within the webpage. This script plays a crucial role in capturing user interactions and performance metrics as users navigate through the application.

When this script is correctly implemented within the webpage source, it enables the RUM tool to collect and analyze data related to page load times, user engagement, and other performance indicators. Without this specific script, the RUM system cannot function, as it wouldn’t be able to track any user experiences or provide meaningful insights into application performance.

Having high user engagement, testing in multiple browsers, and continuous performance monitoring are indeed valuable practices for improving the quality and performance of a web application, but they are not requirements for the fundamental operation of RUM. The core requirement is the proper implementation of the monitoring script, which allows for the collection of real-time data directly from the users’ experiences.