Fix regression from #1957, specify non-zero default timeout. (#2121)
Fix regression from #1957, specify non-zero default timeout. (#2121)

Fixes #2075
kzittritsch/prometheus,amorken/prometheus,JavierZunzunegui/prometheus,GoogleCloudPlatform/prometheus,datajet-io/prometheus,tomwilkie/prometheus,prometheus/prometheus,adamron1/prometheus,kangwoo/prometheus,Colstuwjx/prometheus,GoogleCloudPlatform/prometheus,Conorbro/prometheus,gottwald/prometheus,PrFalken/prometheus,Conorbro/prometheus,dsymonds/prometheus,slok/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,datajet-io/prometheus,adamron1/prometheus,Gouthamve/prometheus,tomwilkie/prometheus,Conorbro/prometheus,amorken/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,brancz/prometheus,AlekSi/prometheus,prometheus/prometheus,alileza/prometheus,Gouthamve/prometheus,adamron1/prometheus,brancz/prometheus,yanghongkjxy/prometheus,tomwilkie/prometheus,datajet-io/prometheus,dsymonds/prometheus,PrFalken/prometheus,JavierZunzunegui/prometheus,alileza/prometheus,JavierZunzunegui/prometheus,SaltedMan/prometheus-annotated,alileza/prometheus,prometheus/prometheus,agaoglu/prometheus,SaltedMan/prometheus-annotated,Colstuwjx/prometheus,tomwilkie/prometheus,prometheus/prometheus,kzittritsch/prometheus,Conorbro/prometheus,kangwoo/prometheus,gottwald/prometheus,dsymonds/prometheus,PrFalken/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,AlekSi/prometheus,Stackdriver/stackdriver-prometheus,tattsun/prometheus,slok/prometheus,kangwoo/prometheus,slok/prometheus,AlekSi/prometheus,dsymonds/prometheus,brancz/prometheus,keegancsmith/prometheus,gottwald/prometheus,alileza/prometheus,Stackdriver/stackdriver-prometheus,kzittritsch/prometheus,agaoglu/prometheus,AlekSi/prometheus,Stackdriver/stackdriver-prometheus,Colstuwjx/prometheus,kzittritsch/prometheus,tattsun/prometheus,agaoglu/prometheus,keegancsmith/prometheus,SaltedMan/prometheus-annotated,gottwald/prometheus,slok/prometheus,alileza/prometheus,amorken/prometheus,JavierZunzunegui/prometheus,keegancsmith/prometheus,SaltedMan/prometheus-annotated,prometheus/prometheus,Stackdriver/stackdriver-prometheus,datajet-io/prometheus,Colstuwjx/prometheus,yanghongkjxy/prometheus,PrFalken/prometheus,adamron1/prometheus,tattsun/prometheus,brancz/prometheus,tattsun/prometheus,yanghongkjxy/prometheus,agaoglu/prometheus,yanghongkjxy/prometheus,keegancsmith/prometheus,amorken/prometheus,Gouthamve/prometheus