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# Mattermost Notifications Service

## On Mattermost

To enable Mattermost integration you must create an incoming webhook integration:

1. Sign in to your Mattermost instance
1. Visit incoming webhooks, that will be something like: https://mattermost.example/your_team_name/integrations/incoming_webhooks/add
1. Choose a display name, description and channel, those can be overridden on GitLab
1. Save it, copy the **Webhook URL**, we'll need this later for GitLab.

There might be some cases that Incoming Webhooks are blocked by admin, ask your mattermost admin to enable
it on https://mattermost.example/admin_console/integrations/custom.

Display name override is not enabled by default, you need to ask your admin to enable it on that same section.

## On GitLab

After you set up Mattermost, it's time to set up GitLab.

Go to your project's **Settings > Services > Mattermost Notifications** and you will see a
checkbox with the following events that can be triggered:

- Push
- Issue
- Merge request
- Note
- Tag push
- Build
- Wiki page

Bellow each of these event checkboxes, you will have an input field to insert
which Mattermost channel you want to send that event message, with `#town-square`
being the default. The hash sign is optional.

At the end, fill in your Mattermost details:

| Field | Description |
| ----- | ----------- |
| **Webhook**  | The incoming webhooks which you have to setup on Mattermost, it will be something like: http://mattermost.example/hooks/5xo... |
| **Username** | Optional username which can be on messages sent to Mattermost. Fill this in if you want to change the username of the bot. |
| **Notify only broken builds** | If you choose to enable the **Build** event and you want to be only notified about failed builds. |


![Mattermost configuration](img/mattermost_configuration.png)