Free disk space on primary volume?

Is there a way to have a graph for only the primary (or one selected) disk appear on the nodes page? When selecting the disk.space metric, the height of the node’s row grows to almost the full height of the page due to a stack of graphs for every volume on the node. I’m hoping there’s a way to just see and monitor a single volume, and receive an alert when the available space on the volume drops below a threshold. Can we do this?
Thanks

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