It would be great if we can get alerts if our pipeline is 1000 Meg's and we reach 90% of that twice in one week to get an alert on it.
The firewall does already have quotas, if you're looking to manage bandwidth. Otherwise, I'd suggest looking into bandwidth reports using a tool like Dimension.
This request, and the others you've posted recently suggest that you're trying to set up a very notification heavy server. I'd strongly suggest going the direction of reports that can be reviewed. If an admin receives a large amount of notifications in a short time, they'll generally start ignoring them rather than acting on them.
For a bandwidth report, you'd be able to look at your bandwidth trends, and compare a rising trend, vice being reactionary on one specific alert, assuming it was acted on.
If you do want to use alerts, I would suggest looking into quotas which can send alerts along with their set action.
WatchGuard Customer Support
Good request. I do this now with PRTG and SNMP which works well.