Zabbix Server Not Starting And No Logs

[Singularity]

Zabbix Server Version : 4.4.10
Database : AWS Postgres RDS

One of my team members was performing maintenance on RDS. He didn't stopped zabbix server and neither has he setup maintenance window in zabbix.

Problem Statement :
1. After maintenance it was found that zabbix server went down
2. No logs registered in /var/log/zabbix/zabbix_server.log to check what went wrong. Also no errors in syslog related to zabbix_server.
3. When I checked the /var/run/zabbix/zabbix_server.pid file, it was missing.
4. When I tried just to check if zabbix_server command is working or not with : zabbix_server -V
In return I got
Command 'zabbix_server' not found, but can be installed with:
apt install zabbix-server-mysql
apt install zabbix-server-pgsql

What could be the possible reason that the file went missing and zabbix-server is not there ? Is this some sort of bug ?
Thanks in advance.

[tim.mooney]

I'm pretty sure you answered this queestion:

What could be the possible reason that the file went missing and zabbix-server is not there ? Is this some sort of bug ?

When you said this:

One of my team members was performing maintenance on RDS. He didn't stopped zabbix server and neither has he setup maintenance window in zabbix.

In other words, your team member did something that inadvertently broke it. Maybe go back through that person's shell history, to see if you can spot any possible things that would have caused the package to be removed.