How can you know that the systems are at maximum capacity? These number don't mean anything if you don't have something to compare with! How do you know CPU is at maximum capacity? What are the values for reference? What do the numbers exactly mean?

As far as I can see I don't know if my CPU is performing well or not because there't nothing that tells me that the CPU should not be having more than 13040200020 as total for 1 day for example!