Custom Performance Metrics
Custom Performance Metrics are user-defined measurements used to track specific aspects of application performance beyond standard metrics like page load time or CPU usage. They allow developers to monitor business-critical performance indicators tailored to their application's unique requirements, such as time to interactive for key components or error rates for specific API endpoints. This concept is often implemented using web APIs like the Performance API in browsers or custom logging in backend systems.
Developers should learn and use Custom Performance Metrics when standard metrics don't capture the user experience or business goals of their application, such as in complex single-page applications, real-time systems, or e-commerce platforms where specific interactions directly impact revenue. They are essential for identifying performance bottlenecks unique to the application's architecture, enabling targeted optimizations and improving overall user satisfaction and retention.