External issue tracker integration broken in 9.5.0

Summary

When configuring an external issue tracker like Redmine, Jira, Bugzilla the integration is not working anymore. Verified with Redmine and Bugzilla. Both on a private gitlab instance (CE) and gitlab.com

Steps to reproduce

  1. Go to Project->Settings->Integrations->Redmine
  2. Fill & save the form. e.g
Project URL: https://redmine.example.com/projects/someproject
Issues URL: https://redmine.example.com/issues/:id
New issues URL https://redmine.example.com/projects/someproject/issues/new
  1. Click on "Issues" in navigation

Example Project

https://gitlab.com/jbbr/testproject - configured with Redmine

What is the current bug behavior?

  • Gitlab issue tracker is still used everywhere (Issues can be created, list/board/labels... is visible)
  • References of issues in commit messages are not referencing the external tracker

What is the expected correct behavior?

  • Gitlab Issues Button references the external issues page configured in the integration
  • References of issues link directly to the external tracker

Output of checks

This bug happens on GitLab.com but also hosted CE.

Results of GitLab environment info

Expand for output related to GitLab environment info 
$ sudo gitlab-rake gitlab:env:info


System information
System:		Ubuntu 14.04
Current User:	git
Using RVM:	no
Ruby Version:	2.3.3p222
Gem Version:	2.6.6
Bundler Version:1.13.7
Rake Version:	12.0.0
Redis Version:	3.2.5
Git Version:	2.13.5
Sidekiq Version:5.0.4
Go Version:	unknown


GitLab information
Version:	9.5.0
Revision:	77bfdac
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	postgresql
URL:		https://gitlab.example.com
HTTP Clone URL:	https://gitlab.example.com/some-group/some-project.git
SSH Clone URL:	git@gitlab.example.com:some-group/some-project.git
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: google_oauth2


GitLab Shell
Version:	5.8.0
Repository storage paths:
  • default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check 
$ sudo gitlab-rake gitlab:check SANITIZE=true
Checking GitLab Shell ...


GitLab Shell version >= 5.8.0 ? ... OK (5.8.0)
Repo base directory exists?
default... yes
Repo storage directories are symlinks?
default... no
Repo paths owned by git:root, or git:git?
default... yes
Repo paths access is drwxrws---?
default... yes
hooks directories in repos are links: ...
5/1 ... ok
5/2 ... repository is empty
7/3 ... ok
7/4 ... ok
9/6 ... ok
5/7 ... ok
5/8 ... ok
12/9 ... ok
13/10 ... ok
16/12 ... ok
17/13 ... ok
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Access to /var/opt/gitlab/.ssh/authorized_keys: OK
Send ping to redis server: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Sidekiq ...


Running? ... yes
Number of Sidekiq processes ... 1


Checking Sidekiq ... Finished


Checking Reply by email ...


Reply by email is disabled in config/gitlab.yml


Checking Reply by email ... Finished


Checking LDAP ...


LDAP is disabled in config/gitlab.yml


Checking LDAP ... Finished


Checking GitLab ...


Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
5/1 ... yes
5/2 ... yes
7/3 ... yes
7/4 ... yes
9/6 ... yes
5/7 ... yes
5/8 ... yes
12/9 ... yes
13/10 ... yes
16/12 ... yes
17/13 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.3 ? ... yes (2.3.3)
Git version >= 2.7.3 ? ... yes (2.13.5)
Active users: ... 8


Checking GitLab ... Finished