Tracing

In build.sbt, you can see the dependencies:

1. Brave instrumentation library provides the client side and server side interceptors to propagate trace ID and Spans.
2. URL Connection Reporter can post trace data to a Zipkin server

"io.zipkin.brave" % "brave-instrumentation-grpc" % "4.4.0"
"io.zipkin.reporter" % "zipkin-sender-urlconnection" % "0.10.0"