How to generate a customized report for the mount point usage on OMS?

I'm trying to come up with a report to list all the mount points and usage (percentage of usage), so that I can alert sysadmin to add more space if mountpoints are over 85% full or so.

In OEM grid control, when I click on hosts->select one host->click on local mount points, then it gives me exactly what I want, do you guys know which tables/views, that "click" pulls data from???

I'm looking at the OEM repository tables under sysman, I found a couple of  views.

select * from sysman.MGMT$STORAGE_REPORT_NFS * from sysman.MGMT$STORAGE_REPORT_NFS