@Override public final String toString() {
    return "RabbitMQCollector{addresses="
      + Arrays.toString(connection.builder.addresses)
      + ", queue="
      + queue
      + "}";
  }
Queue zipkin spans will be consumed from. Defaults to "zipkin-spans".
zipkin-collector/rabbitmq/src/main/java/zipkin2/collector/rabbitmq/RabbitMQCollector.java