In earlier days, it was easy to deduct and debug a problem in monolithic applications because there was only one service running in the back end and front end. Now, we are moving toward microservices architecture, where applications are divided into multiple independently deployable services. These services have their own goal and logic to serve. In this kind of application architecture, it becomes difficult to observe how one service depends on or affects other services.

To make the system observable, some logs, metrics, or traces must be emitted from the code, and this data must be sent to an observability back end. This is where OpenTelemetry and Jaeger come into the picture.

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