Publishes up to 10 events (each to one channel) in a single request. Up to 10 events per batch. The event name clients bind to. Application event names are free-form; the `bird:` and `bird_internal:` prefixes are reserved for the protocol and rejected. A Realtime channel name. Only letters, digits, and _ - = @ , . ; Prefix with `private-` or `presence-` for authenticated channels. Arbitrary JSON payload delivered as the event data — an object, array, or scalar. Cap: 10 KB serialized. Exclude this connection from delivery, to avoid echoing a change back to the client that triggered it. The value is the client's connection id, assigned when its connection is established. Attributes of this event's channel to return alongside the publish (same semantics and validation errors as on the channel endpoints). Requesting attributes counts as one additional message toward usage. Per-event channel attributes at publish time, present only when at least one event asked for them via `include`. Positional: one item per event, in request order. Distinct members (presence channels only; requires include=member_count). Connections currently subscribed to this channel (requires include=connection_count and the app's connection-counting flag). Channel-scoped — distinct from the app-wide peak connections metric. A Realtime channel name. Only letters, digits, and _ - = @ , . ; Prefix with `private-` or `presence-` for authenticated channels.