main.go: Remove warning about external_labels
main.go: Remove warning about external_labels

PrFalken/prometheus,dmilstein/prometheus,PrFalken/prometheus,JavierZunzunegui/prometheus,adamron1/prometheus,SaltedMan/prometheus-annotated,msiebuhr/prometheus,Conorbro/prometheus,alileza/prometheus,kzittritsch/prometheus,eliothedeman/prometheus,prometheus/prometheus,amorken/prometheus,ton31337/prometheus,eliothedeman/prometheus,dsymonds/prometheus,slok/prometheus,brancz/prometheus,tomwilkie/prometheus,JavierZunzunegui/prometheus,JavierZunzunegui/prometheus,datajet-io/prometheus,PrFalken/prometheus,AlekSi/prometheus,prometheus/prometheus,tomwilkie/prometheus,tattsun/prometheus,amorken/prometheus,Conorbro/prometheus,Colstuwjx/prometheus,Colstuwjx/prometheus,keegancsmith/prometheus,agaoglu/prometheus,yanghongkjxy/prometheus,GoogleCloudPlatform/prometheus,amorken/prometheus,alileza/prometheus,kangwoo/prometheus,Gouthamve/prometheus,ton31337/prometheus,SaltedMan/prometheus-annotated,AlekSi/prometheus,alileza/prometheus,gottwald/prometheus,gottwald/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,agaoglu/prometheus,tattsun/prometheus,AlekSi/prometheus,dsymonds/prometheus,datajet-io/prometheus,sudhi-vm/prometheus,prometheus/prometheus,gottwald/prometheus,keegancsmith/prometheus,amorken/prometheus,kzittritsch/prometheus,Stackdriver/stackdriver-prometheus,GoogleCloudPlatform/prometheus,adamron1/prometheus,PrFalken/prometheus,sudhi-vm/prometheus,alileza/prometheus,slok/prometheus,sudhi-vm/prometheus,Gouthamve/prometheus,kangwoo/prometheus,brancz/prometheus,dsymonds/prometheus,dmilstein/prometheus,Gouthamve/prometheus,AlekSi/prometheus,Conorbro/prometheus,iksaif/prometheus,yanghongkjxy/prometheus,kzittritsch/prometheus,agaoglu/prometheus,dmilstein/prometheus,keegancsmith/prometheus,Stackdriver/stackdriver-prometheus,eliothedeman/prometheus,dmilstein/prometheus,keegancsmith/prometheus,SaltedMan/prometheus-annotated,kzittritsch/prometheus,Gouthamve/prometheus,Colstuwjx/prometheus,msiebuhr/prometheus,kangwoo/prometheus,iksaif/prometheus,JavierZunzunegui/prometheus,agaoglu/prometheus,kangwoo/prometheus,prometheus/prometheus,tomwilkie/prometheus,SaltedMan/prometheus-annotated,gottwald/prometheus,GoogleCloudPlatform/prometheus,brancz/prometheus,yanghongkjxy/prometheus,msiebuhr/prometheus,Colstuwjx/prometheus,eliothedeman/prometheus,Stackdriver/stackdriver-prometheus,slok/prometheus,yanghongkjxy/prometheus,adamron1/prometheus,alileza/prometheus,brancz/prometheus,tattsun/prometheus,ton31337/prometheus,GoogleCloudPlatform/prometheus,datajet-io/prometheus,dsymonds/prometheus,datajet-io/prometheus,prometheus/prometheus,sudhi-vm/prometheus,tomwilkie/prometheus,ton31337/prometheus,Stackdriver/stackdriver-prometheus,iksaif/prometheus,adamron1/prometheus,Conorbro/prometheus,tattsun/prometheus,iksaif/prometheus,slok/prometheus,msiebuhr/prometheus