SingleStat with Zabbix Triggers

When the source is Zabbix Triggers, There’s a new field replaces on Orginal “Stat” combo box named “Column” as you can see in attachment.!

This prevents me to count all level Triggers. I can only have selected trigger’s count and I need SUM of them.
This wasn’t like this on Grafana 5. After upgrading Grafana v6.1.4 (commit: fef1733), this issue has been occured. Maybe this can be related to Zabbix Datasource, I don’t know.

This is also a good function but I think this should be optional. Maybe an “ALL” option could be added here.