Split JIRA configuration for GitLab < 7.8 and > 7.8

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+# GitLab JIRA integration
+
+GitLab can be configured to interact with JIRA. Configuration happens via
+username and password. Connecting to a JIRA server via CAS is not possible.
+
+Each project can be configured to connect to a different JIRA instance, see the
+[configuration](#configuration) section. If you have one JIRA instance you can
+pre-fill the settings page with a default template. To configure the template
+see the [Services Templates][services-templates] document.
+
+Once the project is connected to JIRA, you can reference and close the issues
+in JIRA directly from GitLab.
+
+## Configuration
+
+The configuration consists of two parts:
+
+- [JIRA configuration](#configuring-jira)
+- [GitLab configuration](#configuring-gitlab)
+
+### Configuring JIRA
+
+We need to create a user in JIRA which will have access to all projects that
+need to integrate with GitLab. Login to your JIRA instance as admin and under
+Administration go to User Management and create a new user.
+
+As an example, we'll create a user named `gitlab` and add it to `jira-developers`
+group.
+
+**It is important that the user `gitlab` has write-access to projects in JIRA**
+
+### Configuring GitLab
+
+JIRA configuration in GitLab is done via a project's
+[**Services**](../project_services/project_services.md).
+
+#### GitLab 7.8 and up
+
+_The currently supported JIRA versions are v6.x and v7.x._
+
+To enable JIRA integration in a project, navigate to the project's
+**Settings > Services > JIRA**.
+
+Fill in the required details on the page as described in the table below.
+
+| Field | Description |
+| ----- | ----------- |
+| `description` | A name for the issue tracker (to differentiate between instances, for instance). |
+| `project url` | The URL to the JIRA project which is being linked to this GitLab project. |
+| `issues url`  | The URL to the JIRA project issues overview for the project that is linked to this GitLab project. |
+| `new issue url` | This is the URL to create a new issue in JIRA for the project linked to this GitLab project. |
+| `api url`     | The base URL of the JIRA API. It may be omitted, in which case GitLab will automatically use API version `2` based on the `project url`, i.e. `https://jira.example.com/rest/api/2`. |
+| `username` | The username of the user created in [configuring JIRA step](#configuring-jira). |
+| `password` |The password of the user created in [configuring JIRA step](#configuring-jira). |
+| `JIRA issue transition` | This is the ID of a transition that moves issues to a closed state. You can find this number under JIRA workflow administration ([see screenshot](img/jira_workflow_screenshot.png)).  By default, this ID is `2` (in the example image, this is `2` as well) |
+
+After saving the configuration, your GitLab project will be able to interact
+with the linked JIRA project.
+
+![JIRA service page](img/jira_service_page.png)
+
+---
+
+#### GitLab 6.x-7.7 with JIRA v6.x
+
+_**Note:** GitLab versions 7.8 and up contain various integration improvements.
+We strongly recommend upgrading._
+
+In the unfortunate event that you are still using GitLab < 7.8, consult the
+[jira_old document](jira_old.md) on how to configure JIRA.
+
+## JIRA issues
+
+### Referencing JIRA Issues
+
+When GitLab project has JIRA issue tracker configured and enabled, mentioning
+JIRA issue in GitLab will automatically add a comment in JIRA issue with the
+link back to GitLab. This means that in comments in merge requests and commits
+referencing an issue, eg. `PROJECT-7`, will add a comment in JIRA issue in the
+format:
+
+```
+ USER mentioned this issue in LINK_TO_THE_MENTION
+```
+
+Where:
+
+| Format | Description |
+| ------ | ----------- |
+| `USER` | A user that mentioned the issue. This is the link to the user profile in GitLab. |
+| `LINK_TO_THE_MENTION` | Link to the origin of mention with a name of the entity where JIRA issue was mentioned. Can be commit or merge request. |
+
+![example of mentioning or closing the JIRA issue](img/jira_issue_reference.png)
+
+---
+
+### Closing JIRA Issues
+
+JIRA issues can be closed directly from GitLab by using trigger words, eg.
+`Resolves PROJECT-1`, `Closes PROJECT-1` or `Fixes PROJECT-1`, in commits and
+merge requests. When a commit which contains the trigger word in the commit
+message is pushed, GitLab will add a comment in the mentioned JIRA issue.
+
+For example, for project named `PROJECT` in JIRA, we implemented a new feature
+and created a merge request in GitLab.
+
+This feature was requested in JIRA issue `PROJECT-7`. Merge request in GitLab
+contains the improvement and in merge request description we say that this
+merge request `Closes PROJECT-7` issue.
+
+Once this merge request is merged, the JIRA issue will be automatically closed
+with a link to the commit that resolved the issue.
+
+![A Git commit that causes the JIRA issue to be closed](img/jira_merge_request_close.png)
+
+---
+
+![The GitLab integration user leaves a comment on JIRA](img/jira_service_close_issue.png)
+
+---
+
+[services-templates]: ../project_services/services_templates.md
diff --git a/doc/project_services/jira_old.md b/doc/project_services/jira_old.md
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+# GitLab 6.x-7.7 with JIRA v6.x
+
+**NOTE: This method is deprecated. GitLab versions 7.8 and up, contain various
+integration improvements and we strongly recommend upgrading. The official
+supported document on JIRA integration can be found under [JIRA](jira.md).**
+
+---
+
+In `gitlab.yml` enable the JIRA issue tracker section by
+[uncommenting these lines][jira-gitlab-yml]. This will make sure that all
+issues within GitLab are pointing to the JIRA issue tracker.
+
+After you set this, you will be able to close issues in JIRA by a commit in
+GitLab.
+
+Go to your project's **Settings** page and fill in the project name for the
+JIRA project:
+
+![Set the JIRA project name in GitLab to 'NEW'](img/jira_project_name.png)
+
+---
+
+You can also enable the JIRA service that will allow you to interact with JIRA
+issues. Go to the **Settings > Services > JIRA** and:
+
+1. Tick the active check box to enable the service
+1. Supply the URL to JIRA server, for example https://jira.example.com
+1. Supply the username of a user we created under `Configuring JIRA` section,
+   for example `gitlab`
+1. Supply the password of the user
+1. Optional: supply the JIRA API version, default is version `2`
+1. Optional: supply the JIRA issue transition ID (issue transition to closed).
+   This is dependent on JIRA settings, default is `2`
+1. Hit save
+
+
+![JIRA services page](img/jira_service.png)
+
+
+[jira-gitlab-yml]: https://gitlab.com/subscribers/gitlab-ee/blob/6-8-stable-ee/config/gitlab.yml.example#L111-115