Here in this article lets understand how to create interface bandwidth widget in fortigate firewall to view the various interface usage.
Sometimes when your network speed is very low and if you feel like there is congestion happening, then you can create interface widget for specific WAN Link. If the usage of your network is more than speed of the ISP then you may prefer to increase the ISP line speed.
Under dashboard >> status, click on new widget
Then click on Interface bandwidth tab, under interface section select the specific WAN interface which you want to monitor
Now you will be able to see the usage in the form of graph under (dashboard >> status) menu
Here in this tab, you can select graph per hour, per 24 hours or per 1 week.
Hope this article helps you