Hello. The message "Nginx: Service is down" appears regularly in Zabbix. The service works fine though. An Apache is still running on this server (it listens to the local ports 8887 and 8888) and the zabix sometimes displays the error "Apache: Service is down". Although the Apache works without problems. What could be the problem? Services are connected via Apache by Zabbix agent and Nginx by Zabbix agent. Zabbix version 5.4