Linux node - why can't I see volume information?

I have set up 2 linux nodes for monitoring.

One is perfect, I can see pretty much everything I would expect. The other is not showing any volume information.

Does anyone know what I might be missing? I cant see the Volume info in the Appstack Environment widget and I also have the "All Volumes" widget installed which is blank.

I assume I am missing something simple, but I have yet to be able to find it. Any suggestions would be appreciated. 

Thanks!

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