metatag-8.x-1.x-dev/metatag_custom_tags/metatag_custom_tags.links.action.yml

entity.metatag_custom_tag.admin_add:
  route_name: entity.metatag_custom_tag.admin_add
  title: 'Add Custom tag'
  appears_on:
    - entity.metatag_custom_tag.collection