Software systems today are expected to deliver not only business functionality but also reliability, transparency, and performance at scale. As applications grow in complexity, particularly with the rise of distributed and cloud-native architectures, the ability to understand what is happening inside a running system becomes essential. This visibility into the internal state of an application is often referred to as observability. Observability is not a luxury; it is a necessity that allows developers and operators to detect problems quickly, trace their origins, and ensure the system behaves as expected under varying conditions.