The list of the Server process types: https://www.zabbix.com/documentation/current/en/manual/concepts/server
is missing at least the following processes descriptions:

1. trigger_housekeeper (it is separate from the regular housekeeper)
./zabbix_server/housekeeper/trigger_housekeeper.c:ZBX_THREAD_ENTRY(trigger_housekeeper_thread, args

2. pinger
./zabbix_server/pinger/pinger.c:ZBX_THREAD_ENTRY(pinger_thread, args)
3. service_manager
./zabbix_server/service/service_manager.c:ZBX_THREAD_ENTRY(service_manager_thread, args)
4. ha_manager
./zabbix_server/ha/ha_manager.c:ZBX_THREAD_ENTRY(ha_manager_thread, args)