promql: add json tags, fix query constructor.
promql: add json tags, fix query constructor.

dmilstein/prometheus,ton31337/prometheus,dsymonds/prometheus,GoogleCloudPlatform/prometheus,wndhydrnt/prometheus,RobertKielty/prometheus,keegancsmith/prometheus,Colstuwjx/prometheus,GoogleCloudPlatform/prometheus,tattsun/prometheus,trigrass2/prometheus,amorken/prometheus,rajthilakmca/prometheus,ton31337/prometheus,GoogleCloudPlatform/prometheus,thachmai/prometheus,sudhi-vm/prometheus,Gouthamve/prometheus,alileza/prometheus,datajet-io/prometheus,abhishekamralkar/prometheus,brancz/prometheus,robbiet480/prometheus,Stackdriver/stackdriver-prometheus,PrFalken/prometheus,robbiet480/prometheus,agaoglu/prometheus,Dieterbe/prometheus,trigrass2/prometheus,SaltedMan/prometheus-annotated,hustbill/prometheus,adamron1/prometheus,amorken/prometheus,wndhydrnt/prometheus,gcnonato/prometheus,Conorbro/prometheus,SaltedMan/prometheus-annotated,eliothedeman/prometheus,msiebuhr/prometheus,keegancsmith/prometheus,AlekSi/prometheus,PrFalken/prometheus,GoogleCloudPlatform/prometheus,yanghongkjxy/prometheus,wrouesnel/prometheus,Dieterbe/prometheus,flier/prometheus,dmilstein/prometheus,kzittritsch/prometheus,mtanda/prometheus,dln/prometheus,jmcfarlane/prometheus,bluecmd/prometheus,dsymonds/prometheus,mrwacky42/prometheus,bluecmd/prometheus,laushinka/prometheus,yanghongkjxy/prometheus,rajthilakmca/prometheus,prometheus/prometheus,Conorbro/prometheus,jbdalido/prometheus,nicr9/prometheus,agaoglu/prometheus,slok/prometheus,flier/prometheus,mrwacky42/prometheus,amorken/prometheus,nicr9/prometheus,robbiet480/prometheus,laushinka/prometheus,jbdalido/prometheus,prometheus/prometheus,brancz/prometheus,bluecmd/prometheus,Gouthamve/prometheus,kzittritsch/prometheus,gcnonato/prometheus,rajthilakmca/prometheus,fabric8io/prometheus,thachmai/prometheus,mtanda/prometheus,sudhi-vm/prometheus,alileza/prometheus,Colstuwjx/prometheus,wrouesnel/prometheus,dln/prometheus,Stackdriver/stackdriver-prometheus,abhishekamralkar/prometheus,kangwoo/prometheus,jmcfarlane/prometheus,gottwald/prometheus,prometheus/prometheus,Gouthamve/prometheus,wrouesnel/prometheus,prometheus/prometheus,sudhi-vm/prometheus,wndhydrnt/prometheus,thachmai/prometheus,PrFalken/prometheus,cit-lab/prometheus,fabric8io/prometheus,rajthilakmca/prometheus,trigrass2/prometheus,prasincs/prometheus,datajet-io/prometheus,cit-lab/prometheus,SaltedMan/prometheus-annotated,JavierZunzunegui/prometheus,dln/prometheus,Stackdriver/stackdriver-prometheus,laushinka/prometheus,trigrass2/prometheus,dmilstein/prometheus,jmcfarlane/prometheus,wxdublin/prometheus,mtanda/prometheus,tattsun/prometheus,agaoglu/prometheus,fabric8io/prometheus,msiebuhr/prometheus,JavierZunzunegui/prometheus,yanghongkjxy/prometheus,adamron1/prometheus,jimmidyson/prometheus,Stackdriver/stackdriver-prometheus,dsymonds/prometheus,bluecmd/prometheus,fabric8io/prometheus,msiebuhr/prometheus,Gouthamve/prometheus,RobertKielty/prometheus,wxdublin/prometheus,yanghongkjxy/prometheus,mtanda/prometheus,datajet-io/prometheus,slok/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,RobertKielty/prometheus,prasincs/prometheus,iksaif/prometheus,dalanlan/prometheus,tattsun/prometheus,JavierZunzunegui/prometheus,prasincs/prometheus,slok/prometheus,cit-lab/prometheus,abhishekamralkar/prometheus,sudhi-vm/prometheus,dpatel06/prometheus,jbdalido/prometheus,gottwald/prometheus,gcnonato/prometheus,hustbill/prometheus,ton31337/prometheus,AlekSi/prometheus,tomwilkie/prometheus,kzittritsch/prometheus,wrouesnel/prometheus,iksaif/prometheus,adamron1/prometheus,Conorbro/prometheus,alileza/prometheus,SaltedMan/prometheus-annotated,tomwilkie/prometheus,agaoglu/prometheus,brancz/prometheus,slok/prometheus,JavierZunzunegui/prometheus,thachmai/prometheus,abhishekamralkar/prometheus,gottwald/prometheus,Colstuwjx/prometheus,iksaif/prometheus,dpatel06/prometheus,jimmidyson/prometheus,msiebuhr/prometheus,eliothedeman/prometheus,wxdublin/prometheus,brancz/prometheus,laushinka/prometheus,adamron1/prometheus,jbdalido/prometheus,cit-lab/prometheus,ton31337/prometheus,dmilstein/prometheus,kangwoo/prometheus,keegancsmith/prometheus,kangwoo/prometheus,dalanlan/prometheus,kzittritsch/prometheus,Dieterbe/prometheus,tomwilkie/prometheus,gcnonato/prometheus,RobertKielty/prometheus,alileza/prometheus,jimmidyson/prometheus,AlekSi/prometheus,keegancsmith/prometheus,Colstuwjx/prometheus,datajet-io/prometheus,prasincs/prometheus,dsymonds/prometheus,iksaif/prometheus,flier/prometheus,dpatel06/prometheus,dln/prometheus,robbiet480/prometheus,mrwacky42/prometheus,nicr9/prometheus,dalanlan/prometheus,kangwoo/prometheus,alileza/prometheus,Conorbro/prometheus,gottwald/prometheus,AlekSi/prometheus,tomwilkie/prometheus,amorken/prometheus,hustbill/prometheus,PrFalken/prometheus,eliothedeman/prometheus,eliothedeman/prometheus,hustbill/prometheus,jmcfarlane/prometheus,tattsun/prometheus,keegancsmith/prometheus