I set alert on Node Description changed.
And it can notice me about device upgrade, device replace, and so on.
But I notice a bug, when Node SNMP description contain space in the beginning or in the end, Orion will generate a description changed alert when Orion service is restarted.
I check the data store in database, it keep the space in the head or tail.
Maybe there is a ill trim function before Description check function.