Tweak migration doc (#3430)
Tweak migration doc (#3430)


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