groundhogg/admin/{slug}/display/{current_action}

This is used to add custom actions inside groundhogg admin area. This hook accepts the slug of the page and current action for which users are writing handlers.

do_action("groundhogg/admin/{$this->get_slug()}/display/{$this->get_current_action()}", $this);

This hook provides one argument which is an object of the base class. Users can create various operations using this hook.