Query_results returning 'None'

Grafana Prometheus
1

using prometheus datasource , query_results (count(promQL)) is returning none in specific dashboard .
Same query use in some other dashboard working fine .
Actual Dashboard query not working:

Screenshot%20from%202019-06-19%2017-06-19
Screenshot%20from%202019-06-19%2017-06-191851×927 170 KB

Other Dashboards Getting Result:

Screenshot%20from%202019-06-19%2017-05-27
Screenshot%20from%202019-06-19%2017-05-271849×883 164 KB

2

Same issue for me -

This returns results in a variable query -

kafka_server_BrokerTopicMetrics_BytesInPerSec_Count{service_type="kafka", host=~"${host}"}

This does not -

query_result(kafka_server_BrokerTopicMetrics_BytesInPerSec_Count{service_type="kafka", host=~"${host}"})

I’m not sure what’s wrong…