Phoenix.PubSub could be used for this too. You could have a process running on each node that subscribes to a topic called “log_tailers”. Then you broadcast on said topic something like “give me the last 10 lines” and all subscribed processes would return to you the relevant info. :rpc and friends work too.

There are functions in :rpc module :rpc.call, :rpc.cast, :rpc.multicall etc. see Erlang -- rpc
Can be used as

{results, failed_nodes} = :rpc.multicall(Node.list(), mod, fun, args)

Could you please tell more about the scenario, the connection between the user interaction through liveview and distributed nodes? To give an idea why I’m asking is, for example, sometimes all we need is to broadcast data updates that happened on one node to all users connected to any node in the cluster through liveview, in that case Phoenix.PubSub broadcast could be enough and no need to manually call a function on each node. But YMMV =)