pm-4.1.x-dev/modules/pm_priority/pm_priority.links.menu.yml

entity.pm_priority.settings:
  title: 'Priority'
  route_name:  entity.pm_priority.settings
  parent: pm.admin.config_settings

entity.pm_priority.list:
  title: 'Priority'
  route_name: entity.pm_priority.collection
  parent: pm.admin.config_items