edlp_d8/sites/all/modules/contrib/migrate/migrate_tools/migrate_tools.links.action.yml

migrate_tools.add_group_action:
  route_name: entity.migration_group.add_form
  title: 'Add migration group'
  appears_on:
    - entity.migration_group.list

#migrate_tools.add_migration_action:
#  route_name: entity.migration.add_form
#  title: 'Add migration'
#  appears_on:
#    - entity.migration.list