So we just made the mistake of updating (adding) our SNMP community strings on our servers and restart the snmp agents to get the settings to take. What we failed to realize was that Orion reads the uptime of the SNMP agent as the uptime of the servers. BAD BAD BAD. Lots of false reboot messages to lots of people. Needless to say, we are now scrambling to provide a REAL uptime calculation.
So we are requesting that two things occur. First, server uptime be moved from OID 1.3.6.1.21.25.1.1 to 1.3.6.1.2.1.25.1.1, which is actual server uptime, not the agent. Second, some additional checking occurs when Orion sees the counter reset. On windows this could be check the event log for a Shutdown Event / Reason (this would allow Orion to flag the reboot as intentional vs. unintentional). There has to be some similar log on linux.
Please chime in if you would like to see this sooner rather than later.
Edit - To further support my cause, other posts on the topic are below: