Hi Miko, 

We added a delay to the clearing of the red dot notification, which defaults to 10 minutes. In the Advanced Configuration Editor, you can find the delay setting under Configuration > Web Configuration > Other Settings. If you're on-prem, look for AcknowledgeMessageDelaySeconds in web.config.

The filter for Uptime is GuestLastBootTime < $XDAYSAGO, where x is the number of days.