Hi I recently had a pool degrade because a disk failed I only seemed to get one email alert about it which I missed and I only noticed the disk was failed as I logged into the interface (which I very rarely do)
From reading the docs it appears the alert frequency is only how often it checks to see if alerts are needed be sent?
Surely it can be configured to keep sending an alert if its not resolved - if I have a bad pool I want it to hassle me about it - at least an email every day!