Support Slack notifications to Mattermost webhook URLs

My company uses a self-hosted Slack clone called Mattermost. It is generally compatible with Slack webhooks.

The Mattermost webhook URL has the format:

Attempting to set up a Slack notification with this webhook URL fails with the message “Disabled Automatically by Buildkite: Invalid Slack URL”.

Please consider allowing Slack style notifications to Slack compatible (but non-Slack) webhook URLs. Thank you.

Hi @jmajonis!

Buildkite supports Mattermost already—sorry we don’t have any documentation that mentions it. If you email with the URL of your Mattermost server, we’ll help get that setup for you.

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