Remove unsued pipelines-related prometheus metric
Remove unsued pipelines-related prometheus metric

mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,dreampet/gitlab,dreampet/gitlab,iiet/iiet-git,iiet/iiet-git,jirutka/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git