Fix error when reloading code in Sidekiq
Fix error when reloading code in Sidekiq

This commit fixes the following error in development:

    ArgumentError: A copy of Gitlab::Metrics::Transaction has been
    removed from the module tree but is still active!

stoplightio/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,iiet/iiet-git,iiet/iiet-git,mmkassem/gitlabhq,mmkassem/gitlabhq