code: public static String getServiceType() {
          if (UNSET.equals(serviceType) && WARNED_UNSET.compareAndSet(false, true)) {
              LoggerFactory.getLogger(ApplicationLogEvent.class).error("The application name was not set!  Sending 'UNSET' instead :(");
          }
          return serviceType;
      }
docs: Get the service type
  @return the type of service