Email alerts on 40% memory usage or CPU usage

there is cpu threshold db key. anyway, please be noted that if cpu is heavily loaded, bigip might not be able to send notification.

The cpu.logthreshold database variable provides a configurable value for the CPU utilization threshold. When the CPU utilization exceeds this configured value, the chmand process logs a warning message in the /var/log/ltm file. By default, the cpu.logthreshold database variable value is set to 0 (zero) for all platforms except for certain platforms, such as the BIG-IP 2000s and 4000s, where this database variable is set to 80 by default.

there is cpu threshold db key. anyway, please be noted that if cpu is heavily loaded, bigip might not be able to send notification.

The cpu.logthreshold database variable provides a configurable value for the CPU utilization threshold. When the CPU utilization exceeds this configured value, the chmand process logs a warning message in the /var/log/ltm file. By default, the cpu.logthreshold database variable value is set to 0 (zero) for all platforms except for certain platforms, such as the BIG-IP 2000s and 4000s, where this database variable is set to 80 by default.

it is a db key.

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list sys db cpu.logthreshold
sys db cpu.logthreshold {
    value "0"
}

it is a db key.

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list sys db cpu.logthreshold
sys db cpu.logthreshold {
    value "0"
}

I changed the value to 8 for testing and when cpu went above 8 I see no log in the /var/log/ltm for this.

i understand it is measured by 5 minutes (300 seconds) interval.

e.g.

 db key

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list sys db cpu.logthreshold
sys db cpu.logthreshold {
    value "5"
}

 /var/log/ltm

Dec 13 16:29:03 ve11a notice chmand[6279]: 012a0005:5: Cpu utilization over 300 seconds is 38%, exceeded log level 5%