pm-4.1.x-dev/modules/pm_priority/pm_priority.routing.yml

entity.pm_priority.settings:
  path: 'admin/pm/priority'
  defaults:
    _form: '\Drupal\pm_priority\Form\PmPrioritySettingsForm'
    _title: 'Priority'
  requirements:
    _permission: 'administer pm priority'