Is it possible to use two issue trackers simultaneously?

I’m playing with GitLab (community edition) repo settings and I came by issue tracker settings. There’s the possibility to link the JIRA issue tracker with GitLab’s one. In result, the GitLab issue tracker is overshadowed by JIRA. My question is:

Is it possible to have GitLab and JIRA issue tracker turn on at the same time so that I don’t overshadow the GitLab’s one?

I would also be interested in this. Perhaps a custom prefix setting for the internal and (any number of) external trackers?

I have diferents redmine (each one for department), and I would like connect issues external tracker for each project with diffents redmine (differents urls)

Can I setup multiples connections for multiples issues tracker of Redmine??

example of gitlab.rb

  gitlab_rails['issues_tracker_redmine'] = true
 gitlab_rails['issues_tracker_redmine_title'] = "Redmine1"
 gitlab_rails['issues_tracker_redmine_project_url'] = "http://redmine1.domain.com/projects/:issues_tracker_id"
 gitlab_rails['issues_tracker_redmine_issues_url'] = "http://redmine1.domain.com/issues/:id"
 gitlab_rails['issues_tracker_redmine_new_issue_url'] = "http://redmine1.domain.com/projects/:issues_tracker_id/issues/new"


  gitlab_rails['issues_tracker_redmine'] = true
 gitlab_rails['issues_tracker_redmine_title'] = "Redmine2"
 gitlab_rails['issues_tracker_redmine_project_url'] = "http://redmine2.domain.com/projects/:issues_tracker_id"
 gitlab_rails['issues_tracker_redmine_issues_url'] = "http://redmine2.domain.com/issues/:id"
 gitlab_rails['issues_tracker_redmine_new_issue_url'] = "http://redmine2.domain.com/projects/:issues_tracker_id/issues/new"