What does the "used" data refer to on the Resources CPU graph of Red Hat Mobile Application Platform?

Updated 2019-05-24T09:10:28+00:00

Issue

On the Resources screen for a domain in the Studio, there is a dashboard for each environment, showing 3 graphs: Memory, CPU, and Disk.
The CPU graph shows data for apps and used.
What does the used data mean?
Screenshot showing sample graph

Environment

Red Hat Mobile Application Platform 3
Red Hat Mobile Application Platform 4

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