Increase prometheus adapter test coverage to 100%. (#389)
Increase prometheus adapter test coverage to 100%. (#389)


istio/old_mixer_repo,jmuk/mixer,rkpagadala/mixer,ZackButcher/mixer,guptasu/mixer,ZackButcher/mixer,xiaolanz/mixer,xiaolanz/mixer,douglas-reid/mixer,xiaolanz/mixer,rkpagadala/mixer,ZackButcher/mixer,jmuk/mixer,douglas-reid/mixer,jmuk/mixer,rkpagadala/mixer,istio/old_mixer_repo,istio/old_mixer_repo,guptasu/mixer,guptasu/mixer,douglas-reid/mixer