Downtime report for Interface

Hi Everybody,

I would like to create a specific report which displays :

How many minutes my bandwidth is greather than 70% per mounth to know if we need to upgrade the Wan link.

I create an alert so information is available in events table but is it possible for you to create this kind of report ? (like a capacity planning report only for interface utilization).

I saw a lot of report about downtime only for "Down device or Interface" but not for a specific threshold.

Thanks for your help