metatag-8.x-1.x-dev/metatag_custom_tags/metatag_custom_tags.routing.yml

entity.metatag_custom_tag.collection:
  path: '/admin/config/search/metatag/custom-tags'
  defaults:
    _entity_list: 'metatag_custom_tag'
    _title: 'Custom tags'
  requirements:
    _permission: 'administer custom meta tags'
  options:
    _admin_route: TRUE

entity.metatag_custom_tag.admin_add:
  path: '/admin/config/search/metatag/custom-tags/add'
  defaults:
    _entity_form: 'metatag_custom_tag.add'
    _title: 'Add Custom tag'
  requirements:
    _permission: 'administer custom meta tags'
  options:
    _admin_route: TRUE

entity.metatag_custom_tag.edit_form:
  path: '/admin/config/search/metatag/custom-tags/{metatag_custom_tag}/edit'
  defaults:
    _entity_form: 'metatag_custom_tag.edit'
    _title_callback: '\Drupal\metatag_custom_tags\Form\MetaTagCustomTagForm::getTitle'
  requirements:
    _permission: 'administer custom meta tags'
  options:
    _admin_route: TRUE

entity.metatag_custom_tag.delete_form:
  path: '/admin/config/search/metatag/custom-tags/{metatag_custom_tag}/delete'
  defaults:
    _entity_form: 'metatag_custom_tag.delete'
    _title: 'Delete Custom tag'
  requirements:
    _permission: 'administer custom meta tags'
  options:
    _admin_route: TRUE