Small formatting change to interval() to align columns so that:

toronto up 5+18:58, 0 users, load 0.00, 0.00, 0.00
zeus up 109+13:53, 0 users, load 0.55, 0.28, 0.15

looks like:

toronto up 5+18:58, 0 users, load 0.00, 0.00, 0.00
zeus up 109+13:53, 0 users, load 0.55, 0.28, 0.15