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In a highly distributed world it is crucial to have the best possible insights into your application.
In the old days we achieved this using plain logging and jmx. This does not scale well to highly distributed processing like in microservices though.
This talk shows how to pimp you OSGi based systems with top notch monitoring and tracing capabilities. Using Apache Karaf Decanter we let karaf instances log into a common elastic search instance with almost zero effort and get insights using kibana. The Apache CXF REST and SOAP integrations allow to log and correlate service requests and replies.
Building on top of this we use the OSGi based reactive components framework and reactor.io streams to provide complex event processing capabilities. A typical use case for this is to describe and monitor service level agreements.