Linux System Uptime

You can edit this UnDP to poll every 5 minutes, so it will keep always updated the correct value.

Also, the alert could be like this:

Just to note you need to add this by logging into the Solarwinds box , opening Orion Universal device poller , and File Import

Then assign it to a node , and right click on the poller to show Web Display , to show it in the Summary for the node

If you've come here from : False reboot alert for specific node - SolarWinds Worldwide, LLC. Help and Support

you will need to remove the Linux server from the Node Rebooted Alert through name or OS then create a new alert :

Property to Monitor Custom Node Poller

Then :

Node rebooted Linux

Description of alert:

This alert will write to the NetPerfMon event log when the date and time a machine last booted changes.

Type of Property to monitor

Custom Node Poller

Enabled(On/Off):

ON

Evaluation Frequency of alert:

Every minute

Severity of alert:

Serious

Alert Custom Properties: (1)

ResponsibleTeam: Linux

Alert Limitation Category

No Limitation

Trigger Condition:

Alert on all objects where:
Nodes Custom Properties - ResponsibleTeam - is equal to - Linux
The actual trigger condition:
All child conditions must be satisfied (AND)
Custom Poller - Unique Name - is equal to - System_Uptime
Custom Poller Current Stats - Current Value - starts with – 1:

Can you, or someone, further explain what it takes to properly create an alert based on this poller? I can't seem to set it up so it actually alerts when a linux system with this poller reboots.