What user interaction types fall under "User Actions"?

The classification of user interaction types as "User Actions" is specific to how users interact with an application. Page Load, XHR (XMLHttpRequest), and custom actions are fundamental metrics that capture meaningful interactions within an application.

Page Load reflects the time taken for a web page to be fully rendered and is a direct measure of user experience; it influences user engagement and satisfaction. XHR represents asynchronous requests conducted without requiring a full page reload, which are essential for modern web applications that rely on dynamic content updates. Custom actions are defined by the user or organization to track specific interactions that are vital for tailored analysis and performance monitoring.

In contrast, system notifications and server responses do not represent direct interactions performed by users, making them less relevant in the context of "User Actions." Network configurations and user preferences relate to backend settings rather than user-driven activities. Therefore, the attributes that best encapsulate user actions in a web application setting are indeed those specified in the correct answer, as they measure interactions that occur during typical user workflows.