Steps to reproduce:
- VMware cluster (through vCenter) is monitored by Zabbix Server. Hosts, clusters, VMs are discovered by the Zabbix template discoveries.
- VMware vCenter appliance is restarted.
- After some time, before VMware vCenter appliance returns to online state, Zabbix server crashes and restarts.
- See uploaded log file.
Zabbix Server does not crash when a monitored vCenter Server goes offline.
Note: Zabbix server was recently upgraded from 4.0.33 to 5.0.15, then to 5.0.16. This issue was NOT present on Zabbix Server 4.0!