code: public function alert($message, $class = 'danger', $dismissible = false)
      {
          // "use" our function params so things don't complain
          array($class, $dismissible);
          $args = \func_get_args();
          $meta = $this->internal->getMetaVals(
              $args,
              array('channel' => $this->cfg['channel']),
              array(
                  'message' => null,
                  'class' => 'danger',
                  'dismissible' => false,
              ),
              array('class','dismissible')
          );
          \extract($args);
          $this->setLogDest('alerts');
          $this->appendLog(
              'alert',
              array($message),
              $meta
          );
          $this->setLogDest('auto');
      }
docs: Add an alert to top of log
  
  @param string  $message     message
  @param string  $class       (danger), info, success, warning
  @param boolean $dismissible (false)
  
  @return void