Drupal 8 : Link actions,Link menus,Link Tasks,Routings Link actions Local actions have also been moved out of the hook_menu() system in Drupal 8 .Use actions to define local operations such as adding new items to an administrative list (menus, contact categories, etc). Local actions are defined in a YAML format, named after the module they are defined by. Such as menu_ui.links.action.yml for this example from menu_ui module: menu_ui.link_add: route_name: menu_ui.link_add title: 'Add link' appears_on: - menu_ui.menu_edit Here, menu_ui.link_add: It is the Unique name of the link action Most likely start with module name, route_name : Name of the route it means when click the link it redirect to this route, appears_on : An array of route names for this action to be display on. Now how to know the Route name of any internal/external admin pages like below, By through the drupal console we achieve it, drupal debug:router...
Trying to Learn new things on drupal.