Summary

In this final chapter, we learned about monitoring and observability. We were introduced to the OpenTelemetry library and learned about its goals of making applications observable easier. We also learned about distributed tracing and how it is one of the three pillars of observability.

Later, we added both distributed tracing and metrics to the application using OpenTelemetry and Prometheus. With a little work, both forms of instrumentation were added to the application. To demonstrate this new instrumentation, we made use of a small application to simulate users making requests while we were free to view the recorded data in either Jaeger or Prometheus.

This chapter concludes the adventure we started, which involved taking a synchronous application and refactoring it to turn it into a fully asynchronous application that could be deployed to AWS and be completely observable.