[Hawkular-dev] Hawkular APM and instrumenting clojure

As an experiment I'm instrumenting a service written in clojure using opentracing-java. Through the clojure/java interop I've mostly succeeded in getting trace information reported through to the Hawkular APM server. I say "mostly succeeded" because sooner or later in every one of my hacking sessions I get to the point where the spans I am creating in the app are no longer reported in the web ui. For convenience I'm using the Hawkular dev docker image <https://hub.docker.com/r/jboss/hawkular-apm-server-dev>;. In my test app I'm doing nothing more than initializing an APMTracer <https://github.com/hawkular/hawkular-apm/blob/master/client/opentracing/s... with the appropriate environment variables set, and then calling buildSpan("foo"), withTag("sampling.priority", 1), start(), sleep for a while, and then finish(). Where all of the previous was done in clojure, but I'm talking in pseudocode here just to make the intent clear. So like I said, sometimes these traces are reported, other times they seem to be silently dropped. I can't detect any consistent pattern how or why this happens... (1) Is using a "sampling.priority" of 1 merely advisory? It would explain everything if those traces are meant to be dropped. (2) Is there any convenient way I can see, with increased logging or something, which traces are actually being sent from the client, and which are actually received by the server?