CPU tab shows live CPU consumption statistics under CPU usage telemetry.
It is available when you are connected to the profiled application, as well as in snapshots.
The telemetry information is remembered in a circular buffer in the profiler agent memory. This allows you to connect to a profiled application on demand and discover how the application behaved in the past.
The buffer capacity is 1 hour by default, and can be changed with the startup option telemetrylimit.