docs: protected String failMsg(final Throwable thrwbl, final String queue, final Job job) throws IOException {
          final JobFailure failure = new JobFailure();
          failure.setFailedAt(new Date());
          failure.setWorker(this.name);
          failure.setQueue(queue);
          failure.setPayload(job);
          failure.setThrowable(thrwbl);
          return ObjectMapperFactory.get().writeValueAsString(failure);
      }