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`Phoenix.PubSub.local_broadcast/4`

In order to broadcast messages only for current node I used to spin-up a Registry with keys: :duplicate and use it as local non-distributed PubSub. (Just like described in Registry # Using as a PubSub)

Apparently, if the project already includes phoenix_pubsub dependency there is Phoenix.PubSub.local_broadcast/4 that does the work!