Add the following to the end of /etc/zabbix/zabbix_agentd.conf
# Memcached Keys
UserParameter=memcached.stats[*],(echo stats; sleep 0.1) | telnet localhost 11211 2>&1 | awk '/STAT $1/ {print $NF}'Restart the Zabbix agent
/etc/init.d/zabbix-agent restart