public Builder subscriptionName(String subscriptionName) {
      if (StringUtils.isNullOrEmpty(subscriptionName)) throw new NullPointerException("serviceUrl is null or empty");
      consumerProps.put("subscriptionName", subscriptionName);
      return this;
    }
Specify the subscription name for this consumer. No default.
zipkin-collector/pulsar/src/main/java/zipkin2/collector/pulsar/PulsarCollector.java