code: protected String statusMsg(final String queue, final Job job) throws IOException {
          final WorkerStatus status = new WorkerStatus();
          status.setRunAt(new Date());
          status.setQueue(queue);
          status.setPayload(job);
          return ObjectMapperFactory.get().writeValueAsString(status);
      }
docs: Create and serialize a WorkerStatus.
  
  @param queue the queue the Job came from
  @param job the Job currently being processed
  @return the JSON representation of a new WorkerStatus
  @throws IOException if there was an error serializing the WorkerStatus