There is an out of the box alert for interface utilization with top talkers that can use, just search top talkers on the manage alerts page and you should find it.
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There are some great resources in Thwack that deal with customizing alerts using what sounds like exactly what you're asking for.
You can search Thwack for "Customizing Alerts" and come up with some great questions & answers.
Thanks for pointer,. Very straightforward, thanks