2019-05-07 Newly created unlabelled issues requiring initial triage

Hi Triage Team,

Here is a list of the latest issues without labels in the project.

In accordance with the issue triage workflow, we would like to ask you to:

1. Check for duplicates in this project and others (it is common for issues reported in EE to already exist in CE)
2. Add a type label
3. Add a team label
4. Add relevant subject labels
5. Mention relevant domain experts if the issue requires further attention

For the issues triaged please check off the box in front of the given issue.

• https://gitlab.com/gitlab-org/gitlab-ee/issues/11517 JIRA Development Panel Integration: list repo is empty
• https://gitlab.com/gitlab-org/gitlab-ee/issues/11510 Feature request: Mattermost on Gitlab.com
• https://gitlab.com/gitlab-org/gitlab-ee/issues/11503 Approval Rules error
• https://gitlab.com/gitlab-org/gitlab-ee/issues/11499 Clean code and remove update_all_mirrors_worker_rescheduling feature flag
• https://gitlab.com/gitlab-org/gitlab-ee/issues/11495 MR approvals are notified to Slack as "MR opened" messages instead of "MR approved"

/cc @gl-quality