public function getConfigurableOptions()
{
$resolver = new OptionsResolver();
$resolver->setDefaults(['load_from' => null, 'task' => null, 'triggered_by' => ['php']]);
$resolver->addAllowedTypes('load_from', ['null', 'string']);
$resolver->addAllowedTypes('task', ['null', 'string']);
$resolver->addAllowedTypes('triggered_by', ['array']);
return $resolver;
}