Zabbix. How to put a trigger into an error state if there is no data?

Question

Zabbix

Hello.

I ping hosts from zabix on their dns. There the program is called fping.
Everything seems to be working. If pings pass the trigger is green, if not, red.

The problem creeps out then, the code cannot be converted dns to ip. The data simply does not appear and the trigger does not change its value.
How to put a trigger into an error state if there is no data?

In zabbix for a couple of days, do not judge strictly ..

Answer 1

There is a nodata function . Usually it is used in combination with a threshold value, for example - "N percent ping loss or no data for such and such a period."