simplenews.newsletter_add:
  route_name: simplenews.newsletter_add
  title: 'Add newsletter'
  appears_on:
    - simplenews.newsletter_list

simplenews.subscriber_add:
  route_name: entity.simplenews_subscriber.add_form
  title: 'Add subscriber'
  appears_on:
    - entity.simplenews_subscriber.collection

simplenews.newsletter_issue_add:
  route_name: node.add
  appears_on:
    - view.simplenews_newsletters.page_1
  deriver: 'Drupal\simplenews\Plugin\Derivative\AddSimplenewsIssueActionLinks'