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It is an Akka distributed tracing extension which can be used as performance diagnostics and debugging tool. Distributed nature of Twitter's Zipkin (which it is based on) provides synergy with akka-remote and akka-cluster. Extension integrates with Spray toolkit and Finagle services.
Sampled traces can contain not only timing info, but custom annotations and key-value pairs, which, in turn, can be used as filtering parameters in Zipkin's Web UI. It's better to see once:
Navigate to Zipkin online demo to see it in action.
If you want to see actual code, project's activator template is a good starting point. It setups local Zipkin infrastructure and demonstrates common use cases.