How to get data in filter dropdown on Grafana dashboard?

After configuring dashboard for Solr-Cloud in Grafana(Solr > Prometheus > Grafana), I am getting only “All” as the value under zkhost, core and collection dropdowns.

In my Solr-Cloud I have 2 Nodes and 3 Zookeepers.
cmd to get the data from exporter for Prometheus.

.\bin\solr-exporter -p 9983 -z “,,” -f .\conf\solr-exporter-config.xml -n 16

Any help is much appreciated.