The Dashboard
The Dashboard is mission control: host CPU, memory and disk, what is running right now, and recent activity. The charts and numbers are built in - there is nothing extra to set up.
Host gauges show live CPU, RAM and disk for the machine running your labs - if a big lab with virtual machines will not fit, you see it here first. Below, running labs and their node counts.
The bell in the top bar collects notifications - host pressure warnings, lab events, update notices. Style what the Dashboard shows under Settings → Dashboard Appearance.
Inside a lab, the same numbers appear for each device (Inspector → Metrics) and each link (select a link). The Dashboard shows the same data for the whole computer.