validate the label name
validate the label name

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