Solarwinds alert on volume

Hi

I would like to alert on volume space, and in the message mention the volume letter (Windows) or mount path (Linux), So I use variables in the "alert action" message box.
When I use the "caption" variable (for volume) I get a good result for Linux machines, but for Windows machines I get the "c:\" drive together with some non relevant text, for example "c:\ label 1234324" (or something like that).

Now, instead the "Caption" variable I can use the "Device ID" variable which work find for Windows (fetch exactly c:\), but for Linux it fetch the physical drive, and not the mount point (I need the mount point)

So what is the best why to bring the exact "c:" for windows and /var (for example) for Linux?

Thanks