Yggdrasil.Backend.publish

You're seeing just the callback publish, go back to Yggdrasil.Backend module for more information.
Link to this callback

publish(channel, message, metadata)

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Specs

publish(channel :: Yggdrasil.Channel.t(), message :: term(), metadata :: term()) ::
  :ok | {:error, term()}

Callback to publish a message in a channel with some metadata.