SMG Monitor: scan node data table - no data!

I'm trying out the various gadgets but I'm getting nowhere with the scan node data table. I don't even know what it is supposed to display. Thinking

It doesn't seem to matter what policy or data source I select. The Data set always shows No meta-data available.

When I hover over the blue text, this is what I see:

Okay, so what type of node does emit meta-data? 

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Kevin Boyle, 
Knowledge Partner

Calgary, Alberta, Canada