Itens doesn't show on grafana

Hello folks, how are all of you ?
When I try to configure a few items on grafana, for example:
At zabbix - information [ firmware, model and serial number ]

At grafana, when I select Information at Application in Query mode, doesn’t appear nothing.
Can you guys help me ?
I´m starting to work with grafana now, i´ve already created a few graphs but this is issue I did not understand yet.

Other doubt is: at item, i´ve saw a few commands as /.*/ , did you guys have others to share ?

Thankssss !

read this guide How to troubleshoot metric query issues