The computed max tonnage (quantity seen on hover over) is the maximum output of the material from the loading tool to the processor given unlimited trucks. It would be similar to a situation where the loading tool was loading without hang time.
This is driven from assignment
What you would achieve given you had unlimited trucks
The target tonnage (quantity seen on hover over) is the maximum output of the material from the loading tool to the processor given the trucks available for assignment. This is to meet to the rate seen in the production plan.
This is the number of trucks assignment thinks should be assoicated with the production arc
This is what assignment wants
The number of trucks locked to the source
The number of trucks locked to multiple sources.
The number of trucks in assignment considing all restrictions, being locks and bars, assignment groups, arc, processor, material, assignment delays and non assignment delays.
Actual number of trucks that are assigned to the loading tool, queued at the dump associated with the loading tool, dumping after being loaded from the loading tool, traveling loaded from being loaded from the loading tool.