pm-4.1.x-dev/modules/pm_note/pm_note.links.action.yml

pm_note.type_add:
  title: 'Add Note type'
  route_name: entity.pm_note_type.add_form
  appears_on:
    - entity.pm_note_type.collection

pm_note.add_page:
  title: 'Add Note'
  route_name: entity.pm_note.add_page
  appears_on:
    - entity.pm_note.collection
    - view.pm_note.collection
    - entity.pm_project.canonical