Discovery: how to check against the max value over all objects

[mbrackeva]

Consider this scenario:

• I set up a discovery of all local disks on Linux servers, on of the item prototypes is "Busy" (disk busy in %).
• I can successfully create triggers against this item prototype.
• I now want to create a trigger that checks the highest Busy value over all disks. In other words: create an event when the disk with the highest Busy value has a busy value over 90%.

Any ideas if this is possible?