I know this doesn't answer your question, but from my experience those alerts don't mean much anyway - I feel that they're only useful in report form, not so much in a "check every XX hours and email me" kind of way.
In fact, I disabled those alerts altogether after significantly bumping up the amount of array-based deduplicated storage available to my VM guests...
Just wanted to offer another way of looking at things... :-)
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I agree, especially about optimization data being shown as an alert. WIth the built-in alerts, I think you really have to review them and add/change/delete based on your desired operational standards. For example, the alert you mentioned (Over-allocated Space), it unfortunately includes all disks (e.g. RDMs) in it's summation, not just thin disks. So my file server shows reclaimable space of 230+ GB, even though the thin-provisioned C drive is only 60 GB. That extra "space" comes from my file share LUNs. So I have to adjust it to exclude these RDMs.
I've made similar adjustments on about 6 other alerts and continue to think over the remaining defaults.
But as you said, the truly best thing to have in vMan would be a widget that can show "Best Practice" or "Optimization" items, separate from real, hair-starting-to-smoke alerts.
Thanks, guys. Yeah, the VMan alerts definitely call for a good amount of tweaking and even disabling on a few, depending on your environment.
We'll see if anyone else out there has a favorite or magic recipe for reducing the count, especially of the automated variety .