Cardinality aggregator with grafana pluging about druidplugin

[nikhil2406]

@amoussoubaruch all existing aggregators works only with metric values as of now. I dont see cardinality aggregation option implemented currently.
was checking druid documentation for cardinality aggregator which says "Please note that this aggregator will be much slower than indexing a column with the hyperUnique aggregator"
Not sure if it was deliberately not implemented in plugin.
Can you provide more information about your use-case? May be others also would be able to provide alternatives or else +1 your request.

thanks,
nikhil.

[amoussoubaruch]

@nikhil2406 Thanks for your answer!

In my dataset i have only one metric value. I have many dimension columns. i want to do real time monitoring with IOT data that i take from kafka. One field is hostname. Data are provided by more country.
My first goal is count how many distinct hostname for each country i have?
Can you thinks that is it possible?

Thanks,
ADB

[Gauravshah]

would hyperUnique not solve your problem ? It would be approximate though.