The calculated items allowed us to write a specific formula, referencing exact individual items. This worked well for small-scale calculations, but the CPU Load item we created last would be very hard to create and maintain for dozens of hosts, and impossible for hundreds. If we want to calculate something for the same item key across many hosts, we would probably opt for aggregate items. They would allow us to find out the average load on a cluster or the total available disk space for a group of file servers, without naming each item individually. As with the calculated items, the result would be a normal item that could be used in triggers or graphs.
To find out what we can use in such a situation:
Go to Configuration
