Help Finding CPU Best Practices Documentation

I have spend the better part of an hour looking for a document to help convince my team that getting a 95% cpu usage alert multiple times per day is something we need to address. I understand how to research and fix a high cpu condition, but I am not asking for that. In my MongoDB dba cert class I am certain I read something that stated a best practice of anything over 90 or 95 is something that you should not be OK with, but I cannot find it. Please help!

A concerned MongoDB activist! :slight_smile: