How to convert rosgraph output to graphical representation?

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Exactly, I was thinking about a diagram. Thanks for the hint! In case one would like to add a "converter" functionality to e.g. rosgraph where would the most suitable place to add it there?

rosgraph itself doesn't have any dependencies right now other than rospkg. It's probably best to keep it that way.

Seeing as rqt_graph already contains the infrastructure, perhaps adding a stand-alone command line script there would be nice.

Alternatively, I could imagine that refactoring rqt_graph to make the RosGraphDotcodeGenerator into a stand-alone library might also make sense. rqt_graph could then use that, as well as a new tool that does what you are after.

Using one of your suggested approaches could it be made compatible with rqt_graph - "Topic statistics"?

I'm unsure as to what you're asking: rqt_graph already renders the topic statistics, if they are available. I haven't checked, but I would imagine that the same code that generates the dot graph adds the statistics.

I have statistics enabled with rosparam set enable_statistics true. I cannot run rgt_graph for displaying a diagram on the system I am working on. I am not seeing any /statistics topic. seems like rqt_graph is not installed on there...

Statistics gathering is independent of rqt_graph. If you're not seeing the topic then that would be a different issue. It is a prerequisite for rqt_graph (or some other tool) to visualise them though (obviously).

Did you see the note on wiki/Topics - Topic statistics:

this parameter has to be set before you start your nodes