What is APM?
In today’s world of complex software systems, microservices, and distributed architectures, one term has become a buzzword across engineering teams: Observability . But what does it really mean, and why should you care? Let’s break it down. Observability Defined Observability is the ability to measure the internal state of a system by examining its external outputs . In simpler terms, it’s about understanding what’s happening inside your system based on the data it produces — like logs, metrics, and traces. The term comes from control theory, where a system is said to be “observable” if its internal state can be determined just by looking at its outputs. Applied to software, it means you can answer key questions: Why is my service slow? Where is the error coming from? How are my users experiencing the system? What went wrong during this outage? Core Pillars of Observability There are...