main: Consistently end flag descriptions with periods. (#2977)
main: Consistently end flag descriptions with periods. (#2977)


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