hn-8.x-1.x-dev/modules/hn_cleaner/hn_cleaner.routing.yml

hn_cleaner.admin:
  path: '/admin/config/services/hn/cleaner'
  defaults:
    _form: '\Drupal\hn_cleaner\Form\SettingsForm'
    _title: 'Headless Ninja Cleaner Settings'
  requirements:
    _permission: 'administer hn'