The current server view depicts base storage usage and trending over time; however finding out what's consuming that space currently isn't possible. As you reach your threshold, there are no granular views to figure out what might be consuming the space.

Since base storage expansion is possible but decreasing it is not, we're thinking that a way to determine if we need to expand it is necessary to make decisions on whether we have a machine with runaways storage logs (consuming base storage) or too large of images for a given machine.