What is the unit for the vertical axis of the system CPU health graph?

[verfluchten]

This graph looks confusing. 400 what?

[Patrick M. Hausen]

400 percent. FreeBSD counts in 100 percent per core.

[verfluchten]

There is only 1 physical, non-HT core on this system.

The more I look at it, the more it seems like the green dot = processes measures literally how many processes are running, whereas the rest of dots (blue, orange, etc.) measure the %CPU load hence the vast difference in magnitude. Is this a plausible theory?

[Patrick M. Hausen]

I was mistaken - when you hover over the graph with your mouse pointer you get a legend. It's the number of processes.

[verfluchten]

The balloon does not show the unit either, but it is now pretty clear what it is.

[Patrick M. Hausen]

The unit is processes. The number of them.