It;s nto part of the unit itself, but
I use a third part SNMP monitoring system called Paessler. It is free for 10 or less sensors. Couple nice things: Does not use SQL on the backend so it is pretty light wait, the bandwidth graph is web page and can be shown from any browser on the local network.
The interface is a bit weird, but once you get use to it, it works great.
If you enable QoS you will see some graphs in the admin GUI.
Otherwise you need to enable SNMP on the device and use some SNMP utility of your choice to produce the graphs on your own, see https://live.paloaltonetworks.com/thread/4367?tstart=0 for more info.
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