core/homeassistant/components/blackbird/services.yaml

set_all_zones:
  name: Set all zones
  description: Set all Blackbird zones to a single source.
  fields:
    entity_id:
      name: Entity
      description: Name of any blackbird zone.
      required: true
      example: "media_player.zone_1"
      selector:
        entity:
          integration: blackbird
          domain: media_player
    source:
      name: Source
      description: Name of source to switch to.
      required: true
      example: "Source 1"
      selector:
        text: