I am attempting to clear events for an unmanaged device without deleting this device, is this possible
You should be able to from the Event Monitor.
I can clear all events, however active alerts are still shown under alerts.
With Basic- you need to un-check the box for the alert- Under Configure Basic Alerts-
For an Advanced you would need to Edit the Alert and un-check Enable this Alert box.
The node that has the active alert is unchecked under monitored network objects, the node itself is unmanaged. The alert is still active.
What happens when you acknowledge the alert? or is this stuck in a loop and you need to force a reset>
perhaps my question should be how do I acknowledge an alert
From the website click-> Alerts-> Advanced Alerts-> and select from the list- check - click Acknowledge Alerts