What does Apdex measure within application performance?

Apdex measures user satisfaction based on application speed by providing a standardized way to gauge how well an application meets user expectations in terms of performance. It quantifies user experience into a score that indicates the level of satisfaction with response times, distinguishing between acceptable and unacceptable performance.

When analyzing application performance through the lens of Apdex, it categorizes response times into three groups: satisfied, tolerating, and frustrated users. A higher Apdex score indicates that a larger portion of users find the application's response times acceptable, thus providing an insightful measurement of user satisfaction directly linked to application speed.

In contrast, overall application usage statistics, server health over time, and the number of user sessions do not directly reflect user satisfaction or the quality of user experience related to performance. These metrics provide valuable information related to application usage but do not capture the subjective aspect of user satisfaction that Apdex focuses on.