code: function getArgs (fn) {
    const fnString = fn.toString();
    const argList = /[(]([^)]*)[)]/.exec(fnString)[ 1 ].split(',');
    return argList.map(String.prototype.trim);
  }
docs: /* log
  `rabbot.amqp-connection`
  `debug`
  when amqplib's `connection.close` promise is rejected
  `info`
  connection attempt
  connection success
  connection failure
  no reachable endpoints