Hello there:
Just built a new system w/ CE version 17.9 on Centos 7.2 .  When I create/run the following Alert Check, it shows as 'OK' for my devices:  
processor_usage greater 90   *    * 
When I go to a device and view graphs, it shows a device w/ 100% CPU utilization
No errors in logs/db.log.
Is my syntax incorrect?
 Thank you.