Is there any way to trigger alert directly from a Linux node by running something (program)?
You want to the linux node to instantly trigger an alert in orion? Will not work, not instantly.
For example, You can monitor a logfile on the linux machine. When the log file say "go" the component in orion becomes critical. Then you have an alert that fires if that component is critical. There you have latency in both monitoring and alerting.
Faster is that the linux node sends a syslog or trap to orion Log Analyzer. That will remove the latency in component monitoring but not in alert handling, there you anyway have some latency. But it can be lower.
so it depends on how fast you want the alert to trigger. If it's ok to have a couple of minutes latency it very doable.
Thanks for your insight find that can run logger to log a syslog message and trigger alert by LA.