APM

Application Performance Monitoring (APM) observes the behavior of running applications from entry point to dependency. It correlates requests, distributed traces, errors, database calls, external-service latency, runtime resource use, and deployment versions so teams can locate the source of degraded user experience.

What APM commonly provides

• Transaction and endpoint latency, including percentile distributions.
• Error rates, exception details, and affected releases.
• Service maps and dependency latency.
• Trace-to-log correlation and request context.
• Database query timing and slow-operation analysis.
• Runtime signals such as CPU, memory, allocation, and thread behavior.

APM complements profiling: APM identifies where production transactions are slow or failing, while profiling explains where a process spends CPU time, memory, or other resources.