https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Controller%21ControllerResolver.php/class/ControllerResolver/8.9.x
class ControllerResolver | Drupal API
classdrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Controller%21ControllerResolver.php/class/ControllerResolver/10
class ControllerResolver | Drupal API
classdrupalapi