OptionalchannelsWhich channels to use. Defaults to stone.notifications.default.
OptionaldedupeA key that makes this occurrence unique, so it is not sent twice.
Stated here for a direct call; a notice states its own through dedupe(event).
OptionaldelayWait this many seconds before delivering. Needs a queue; ignored without one, out loud.
OptionalinlineSend here and now instead of queueing, whatever the configuration says.
OptionallocaleForce the language, when it is not the recipient's own. Rarely right.
What a notification says about itself, beyond the template and its params.