Query multiple InfluxDB data sources at the same time

Hi,

I have several InfluxdDB databases as datasources in Grafana and want to write a query which gets all the data from a measurement which exists in all databases.
I use telegraf’s ping plugin to monitor a bunch of hosts.

For example

DBNAME,MEASUREMENT,TAG,FIELD
db1,ping,url,result_code
db2,ping,url,result_code
db3,ping,url,result_code
db4,ping,url,result_code
db5,ping,url,result_code


.

I thought I could accomplish this with a datasource variable and select “all” in the dashboard dropdown box, but this does not work.
Works if I select every single datasource individually, but not all or more than one datasource at the same time.

Is it possible to query more than one datasource at the same time using variables (all)?