Reading the host resource cards
The Dashboard's host cards show how your machine is really doing - CPU, RAM, disk and (where a sensor exists) temperature. They turn amber past 75% and red past 90%, so you can see a lab about to use up the machine's room before it happens, not after.
CPU and RAM show percentage plus the raw numbers underneath (core count and load average for CPU; used/total GB for RAM). Disk shows free space directly, since "how much is left" matters more than the percentage once a box is mostly full.
Below the cards, small trend charts (sparklines) show CPU and RAM over time once enough readings have been collected - a slow climb toward capacity reads very differently from a spike, and the sparkline is what tells them apart.
A Temp card only appears if the host exposes a sensor NetPlex can read, and Swap and KSM cards only appear when your computer has swap (spare disk space used as extra memory) set up or KSM (memory sharing) turned on. Without them, the cards are left out instead of showing zero. See "The Dashboard" for the wider page these cards live on, and "Per-lab resource usage" for the same kind of numbers scoped to one lab instead of the whole host.