Intro:

Our team are using Zabbix Enterprise ZS-5600 and installing Zabbixserver6.0.8 on monitoring server.

Description of Issue:

In the Item session,  Type[Zabbix agent(active)] , I select eventlog[System] in Key field with the monitoring Update interval 30seconds (* you can see the itemSetting.jpg on the Attahment).

At the same time, I build up new Trigger connecting with the Item, setting nodata funtion in the Expression field. (*nodata() - No data received during perioed of time T (1- true, 0- False))

(* I also upload the picture in the Attachment nodata.jpg)

When I set the Expression [nodata(/host004-windows-10.133.13.137/eventlog[System],30)=0]

I sppose it means if Zabbix server receive the data during 30 seconds, the Trigger would function and I could check Problem on the dashborad. 

However, I test the funtion it is not working as I supposed to be. Of course I also tried to change the data receiving time, it is still not funtioning as well.

(* you could check the DataReceive.jpg)

But I changed the Expression of Trigger [nodata(/host004-windows-10.133.13.137/eventlog[System],30)=1], which means if there is no data received, the Trigger would work. In this condition, both Item as well as Trigger functions as I thought.

(* you could check the ItemTriggerSeting.jpg, TriggerResult.jpg)

End

Would you please help us with the issue I mentioned above. Thanks a lot and Looking forwarding to your reply.