Add prefix to relative 3 URLs (#3551)
Add prefix to relative 3 URLs (#3551)


amorken/prometheus,alileza/prometheus,kangwoo/prometheus,brancz/prometheus,Conorbro/prometheus,AlekSi/prometheus,Gouthamve/prometheus,AlekSi/prometheus,Conorbro/prometheus,Gouthamve/prometheus,Stackdriver/stackdriver-prometheus,Conorbro/prometheus,brancz/prometheus,GoogleCloudPlatform/prometheus,brancz/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,kangwoo/prometheus,alileza/prometheus,amorken/prometheus,Stackdriver/stackdriver-prometheus,prometheus/prometheus,keegancsmith/prometheus,brancz/prometheus,Stackdriver/stackdriver-prometheus,keegancsmith/prometheus,keegancsmith/prometheus,Conorbro/prometheus,prometheus/prometheus,alileza/prometheus,kangwoo/prometheus,keegancsmith/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,amorken/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,prometheus/prometheus,Stackdriver/stackdriver-prometheus,AlekSi/prometheus,alileza/prometheus,Gouthamve/prometheus,kangwoo/prometheus,amorken/prometheus,alileza/prometheus,AlekSi/prometheus