More than 80% in CPU and Memory Email Notifications in F5

Hi T0nyP,

Yes, it's possible with a custom alert in user_alert.conf, check this K article below :
https://support.f5.com/csp/article/K3667

You can check the log message send in case of high CPU Usage in /etc/alertd/alert.conf

[root@f5Bigip:Active:In Sync] config # cat /etc/alertd/alert.conf | grep CPU
alert BIGIP_SYSTEM_CHECK_E_CPU_TEMP_HIGH {
lcdwarn description="CPU Temp too high." priority="3"
alert BIGIP_SYSTEM_CHECK_E_AOM_CPU_TEMP_HIGH "Air Temperature near .*? Host.*? is too high .*?" {
lcdwarn description="Air temperature near host CPU is too high" priority="3"

If you use ASM/AWAF module, you can monitor Total CPU Usage with ASM alerts :
https://techdocs.f5.com/en-us/bigip-14-1-0/big-ip-asm-implementations-14-1-0/monitoring-asm-system-resources.html

Regards

All you need to know about CPU and Memory usage on F5 BIG-IP is describe on these KB : 
K05372587: BIG-IP performance check-list 
K71764661: Understanding BIG-IP CPU usage