In both the web console under Alerts and in email Alerts, the value for "actual" is wildly incorrect. It appears that it is displaying the wrong variable. I'm not sure what this variable is. An example alert I received: " SNM status = DOWN for: Device (IP) : DO_router (10.7.1.1) Interface : 3.3(Intake ) Content : actual:14.9982322222222 gt:35:1 threshold:35 Count : 1 Threshold : 1 Date & Time : Mon Jan 10 13:30:00 2011 " The actual temperature is currently 35 according to the graph page for this device, and had a maximum of 39, so the alert was warranted. However, the alert email and alert page on the web interface is showing "14.9982322222222" for the actual. The snmp OID being monitored for this always reports a whole number, so it is impossible that the temperature is "14.9982322222222", not to mention that the graph page is reporting the correct temperature.
See forum thread for others with same issue: https://sourceforge.net/projects/snm/forums/forum/379870/topic/3586231