Steps to reproduce:

1.  I installed zabbix according to your doc
2.  i configured the MySQL DB according to DB 
3.  Installed the zabbix plugin in grafana to query for zabbix metrics and connected successfully in grafana

Result:
See screenshot (how it should look like.png)...

Expected:
Expected behavior should contain information on host or groups for example when i will query the group names which are in Zabbix, as you can see in the screenshot i do not get any information. .. see screenshot ( how it currently is.jpg )

Many people are also facing this issue ! See for example : https://github.com/grafana/grafana-zabbix/issues/1470