Template "Nginx by Zabbix agent" - time-delayed trigger for "Service is down"

[vonlo]

Hi,
I am having problems configuring the trigger for "service is down" in the nginx template. It should alert me only after a 3 minutes.

The default trigger is:

last(/Nginx by Zabbix agent/net.tcp.service[http,"{$NGINX.STUB_STATUS.HOST}","{$NGINX.STUB_STATUS.PORT}"])=0

I tried

max(/Nginx by Zabbix agent - customized/net.tcp.service[http,"{$NGINX.STUB_STATUS.HOST}","{$NGINX.STUB_STATUS.PORT}"],#3)=0

which never triggers and

max(/Nginx by Zabbix agent - customized/net.tcp.service[http,"{$NGINX.STUB_STATUS.HOST}","{$NGINX.STUB_STATUS.PORT}"],3m)=0

which triggers immediately.

Does anyone have a solution for this?

Best regards

[vonlo]

Problem is that the item Nginx: Service status has this preprocessing step Discard unchanged with heartbeat
From the documentation:

If a value is discarded, it is not saved in the database and Zabbix server has no knowledge that this value was received.