utilikit-1.0.0/modules/utilikit_playground/utilikit_playground.routing.yml

utilikit_playground.page:
  path: '/admin/config/development/utilikit/playground'
  defaults:
    _controller: '\Drupal\utilikit_playground\Controller\PlaygroundController::preview'
    _title: 'UtiliKit Playground'
  requirements:
    _permission: 'use utilikit playground'
  options:
    _admin_route: TRUE