https://api.drupal.org/api/drupal/core%21modules%21jsonapi%21src%21Events%21CollectRelationshipMetaEvent.php/class/CollectRelationshipMetaEvent/11.x
class CollectRelationshipMetaEvent | Drupal API
classdrupalapi
https://api.drupal.org/api/drupal/core%21modules%21jsonapi%21src%21Events%21CollectRelationshipMetaEvent.php/11.x
CollectRelationshipMetaEvent.php | Drupal API
phpdrupalapi