Create a global script:
type 'IPMI'
Command 'power off'

Execute that script on a random host, and wait for the 1minute timeout to fail.

result is that the Zabbix server crashes;

8819:20200714:163757.057 cannot connect to IPMI service: Cannot connect to service "ipmi": [2] No such file or directory.
8743:20200714:163757.076 One child process died (PID:8819,exitcode/signal:1). Exiting ...
zabbix_server [8743]: Error waiting for process with PID 8819: [10] No child processes
8743:20200714:163757.119 syncing trend data...
8743:20200714:163757.136 syncing trend data done
8743:20200714:163757.137 Zabbix Server stopped. Zabbix 5.0.2 (revision 352ca05870).
16532:20200714:163807.402 Starting Zabbix Server. Zabbix 5.0.2 (revision 352ca05870).