Which of the following is NOT a use case for RUM?

RUM, or Real User Monitoring, is predominantly focused on capturing and analyzing user experience on the frontend of applications. It provides insights into how users interact with an application, allowing teams to identify and resolve frontend errors, understand frontend performance, and assist in troubleshooting by providing data that can aid support teams in resolving issues.

The first choice relates directly to RUM's purpose, as it helps identify errors that users encounter on the client side. The third option also fits well within RUM's functionality, as it monitors factors such as load times, responsiveness, and overall user experience. Troubleshooting and resolving support tickets can leverage RUM data, as it helps pinpoint issues that users face.

In contrast, monitoring backend performance is outside the scope of RUM, which is specifically designed for frontend analysis. Instead, backend performance is typically monitored through different tools and methods focused on server-side metrics, application performance monitoring, and infrastructure monitoring.