in lib/gitlab/qa/component/gitaly_cluster.rb [138:152]
def self.disable_other_omnibus_services
<<~OMNIBUS
postgresql['enable'] = false;
redis['enable'] = false;
nginx['enable'] = false;
puma['enable'] = false;
sidekiq['enable'] = false;
gitlab_workhorse['enable'] = false;
gitlab_rails['rake_cache_clear'] = false;
gitlab_rails['auto_migrate'] = false;
gitlab_exporter['enable'] = false;
gitlab_kas['enable'] = false;
OMNIBUS
end