@Override public Builder metrics(CollectorMetrics metrics) {
      if (metrics == null) throw new NullPointerException("metrics == null");
      this.metrics = metrics.forTransport("activemq");
      this.delegate.metrics(this.metrics);
      return this;
    }
Configuration including defaults needed to consume spans from a ActiveMQ queue.
zipkin-collector/activemq/src/main/java/zipkin2/collector/activemq/ActiveMQCollector.java