I have a support case open on one issue we're having (errors when editing nodes) but have a few other issues around the new alert manager:
Our "you're low on disk space" alerts are reporting disk size in bytes rather than a more useful measure like MB or GB; and I'm not seeing a good way to convert.
The other headache is we have an alert that we only want to trigger if the condition exists for 72 hours (don't ask) and the web based alert manager doesn't allow for a period of more than 60 minutes.