Microservices architecture brings many advantages over traditional monolithic architectures. Along with the advantages there come new challenges. One of the main challenges is observability. Observability enables us to better understand system behaviour, resolve errors and analyze performance bottlenecks. In the diploma thesis we studied different approaches for application observability. The main focus of this thesis was distributed tracing. We looked at different systems and ways to instrument microservices with distributed tracing. We developed an extension for the KumuluzEE framework -- KumuluzEE OpenTracing. Extension enables us to instrument JAX-RS microservices with distributed tracing, which we later demonstrate on a practical example.
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