Nette\DI\ServiceDefinition::addTag PHP Метод

    public function addTag($tag, $attr = TRUE)
    {
        $this->tags[$tag] = $attr;
        return $this;
    }

 /**
  * @param string $class
  * @return ServiceDefinition
  */
 public function createServiceDefinition($class)
 {
     $definition = new ServiceDefinition();
     $definition->setClass($class);
     $definition->addTag('kdyby.subscriber');
     return $definition;
 }