You're seeing just the function notify, go back to Oban.Notifier module for more information.
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notify(conf, channel, payload)

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notify(Oban.Config.t(), channel :: channel(), payload :: map() | [map()]) :: :ok

Broadcast a notification to listeners on all nodes.

Notifications are scoped to the configured prefix. For example, if there are instances running with the public and private prefixes, a notification published in the public prefix won't be picked up by processes listening with the private prefix.


Broadcast a gossip message:

Oban.Notifier.notify(Oban.config(), :gossip, %{message: "hi!"})