varnish-8.x-1.x-dev/varnish.routing.yml

varnish.admin_settings:
  path: '/admin/config/development/varnish'
  defaults:
    _form: 'Drupal\varnish\Form\VarnishAdminForm'
    _title: 'Varnish'
  requirements:
    _permission: 'administer site configuration'