Ao instalar o agent zabbix e configurar o IP do servidor zabbix no arquivo zabbix-agentd.conf
Depois de reiniciar o serviço zabbix-agent.service o mesmo apresenta este erro...

zabbix-agent.service - Zabbix Agent
Loaded: loaded (/lib/systemd/system/zabbix-agent.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2021-07-29 00:17:22 -03; 7s ago
Process: 1370 ExecStart=/usr/sbin/zabbix_agentd -c $CONFFILE (code=exited, status=0/SUCCESS)
Main PID: 1372 (zabbix_agentd)
Tasks: 6 (limit: 2356)
Memory: 4.1M
CGroup: /system.slice/zabbix-agent.service
├─1372 /usr/sbin/zabbix_agentd -c /etc/zabbix/zabbix_agentd.conf
├─1373 /usr/sbin/zabbix_agentd: collector [idle 1 sec]
├─1374 /usr/sbin/zabbix_agentd: listener #1 [waiting for connection]
├─1375 /usr/sbin/zabbix_agentd: listener #2 [waiting for connection]
├─1376 /usr/sbin/zabbix_agentd: listener #3 [waiting for connection]
└─1377 /usr/sbin/zabbix_agentd: active checks #1 [idle 1 sec]

jul 29 00:17:22 debian-server-test systemd[1]: Starting Zabbix Agent...
jul 29 00:17:22 debian-server-test systemd[1]: zabbix-agent.service: Can't open PID file /run/zabbix/zabbix_agentd.pid (yet?) after start: No such file or directory
jul 29 00:17:22 debian-server-test systemd[1]: Started Zabbix Agent.