The Network Activity tab of the Application Command Center (ACC) displays an overview of traffic and user activity on your network including:
Top applications in use
Top users who generate traffic (with a drill down into the bytes, content, threats or URLs accessed by the user) Most used security rules against which traffic matches occur In addition, you can also view network activity by source or destination zone, region, or IP address, ingress or egress interfaces, and GlobalProtect host information such as the operating systems of the devices most commonly used on the network.
https://www.paloaltonetworks.com/documentation/70/pan-os/pan-os/monitoring/acc-tabs.html