I just updated my Linux server from version 16.04 LTS to 18.04 LTS.
Then, after that. I also updated the version of my Zabbix Agent in that
server to version 3.4-1+bionic_all.deb (for Ubuntu 18.04 LTS).
The Zabbix Agent is running but there's a notification message says,
"zabbix-agent.service: Supervising process 31344 which is not our child.
We'll most likely not notice when it exits."
Then, upon checking in my Zabbix Server the ZBX button is in RED
Please see attached pictures for more details
Your help is highly appreciated.