I have additional services need to be monitored. Such as snmpd

http://thecpaneladmin.com/adding-services-to-chksrvd-for-monitoring/

add a file /etc/chkserv.d/snmpd
add this content.
service[snmpd]=x,x,x,systemctl restart snmpd.service,snmpd,root
Restart chkservd
/scripts/restartsrv_chkservd