It would be nice to also have an "Information" option for monitored OIDs.
Example:
Device has serial number and software version information available via OIDs
Desire is to get an alert when the software version changes or device is replaced with a new serial number.
This alert does not need to be a warning or critical as it is just housekeeping information. A further idea here is to have the option to aggregate "information" alerts to a single email rather than individual (i.e. an entire building of 10 devices all get software upgrades, be nice to have a single alert email rather than 10 individual)
The idea of historical tracking of OID values would also be useful on this as it would be nice to track historical records of device serial numbers and software versions.