Is there a report for bandwidth use per user?
You can generate a bandwidth report per user by going to Analytics -> Web Insights -> Search for “URL Host” and on the left, apply the filter for appropriate user. See the screenshot below:
I need a report on top 10 users for bandwidth use.
Is there a way to crest a custom report?
My bad, I was thinking you were looking for bandwidth consumption for a particular user.
You can look at the top bandwidth users by running the following query:
Is this for top 100 users report from the bandwidth utilization perspective or from web usage perspective?
Web insights is for web utilization, available in transaction count or bytes. If you are forwarding non-web traffic as well to zscaler, firewall reports can show you all traffic.