I want to generate alert if iowait increases beyond certain threshold. analysis.cfg doesn't have monitoring iowait options in UP, LOAD and CLOCK rules.

I have CPU utilization graph as below in hosts.cfg options which shows iowait

x.x.x.x server1.example.com # noconn nofiles nobbd conn TRENDS:*,vmstat:vmstat1|vmstat3|vmstat4|vmstat5

Could anyone guide me here?