code: function defaultLogger() {
              if(!_defaultLogger) {
                  var prefix = 'master';
                  if(cluster.worker) {
                      prefix = 'work ' + cluster.worker.id;
                  }
                  _defaultLogger = new Logger(process.stdout, prefix, utils.LogLevel.INFO, []);
              }
              return _defaultLogger;
          }
docs: Obtains the default logger. If one has not been set then logging is
  to process.stdout at the INFO level.