Application Performance Monitoring

Application performance monitoring is the predecessor practice from which Ed Ferron says modern Observability grew in EP 14: What is Observability?. The source treats APM as useful but narrower than observability because classic monitoring can focus on application or component health without tying signals to end-to-end business transactions.

The episode’s distinction is practical. APM and monitoring tools may help engineers find fires, but observability asks what customer activity is affected, how widely it is affected, and how the team should engineer around the problem rather than only inspect a dashboard.

Key Claims

• APM platforms helped mature the observability category.
• Monitoring remains useful for operations and engineering incident response.
• Observability extends APM by adding full-stack, business-facing, and real-time decision context.
• The difference matters more as applications become central to revenue, support, onboarding, and customer experience.
• APM tools can provide insight without always requiring new application code, but teams still need to focus them on business activity.

Connections

• Observability and Full Stack Observability - broader successor frame.
• Ed Ferron and Exigent Solutions - source context.
• Business Transaction Observability - business-language extension of application performance.
• Proactive Observability - alerting posture beyond reactive monitoring.
• Machine Learning Engineering and MLOps - adjacent production engineering disciplines.