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the page about rqt_console has the answer to this "rqt_console is a viewer in the rqt package that displays messages being published to rosout". You would also be able to see this in rqt_graph by deselecting the hide debug box so that nodes that are providing information about the system are visible (nodes considered debug are hidden by default as they involved in introspecting the system, rather than directly contributing to the robots behaviour, so are usually a distraction to what you are trying to see in the graph).