Remove dead code.
Remove dead code.

GoogleCloudPlatform/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,keegancsmith/prometheus,kangwoo/prometheus,kangwoo/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,alileza/prometheus,kangwoo/prometheus,prometheus/prometheus,alileza/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,Gouthamve/prometheus,prometheus/prometheus,keegancsmith/prometheus,Gouthamve/tsdb,GoogleCloudPlatform/prometheus,alileza/prometheus,alileza/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,Gouthamve/prometheus,kangwoo/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,prometheus/tsdb