NOTE: Proxies and agents are backwards compatible for one major version.
Confirm backup
Confirm cluster healthy
Put Zabbix Server into maintenance mode (optional)
systemctl stop zabbix-server
If you have a load-balanced frontend, leave it running.sudo yum update zabbix-server
systemctl start zabbix-server
Everything auto-resyncs:
Proxies flush backlog
Agents resume
Trend writers catch up
History sync resumes
Monitoring resumes from the exact point it paused.