Overview of steps

  1. Set up webhooks for Slack
  2. Update Mage project settings

Set up webhooks for Slack

Follow these instructions on Slack to setup incoming webhooks for your workspace.

Update Mage project settings

Once you’ve set up webhooks for Slack, you should have a webhook URL that Slack provides.

Here is an example webhook (yours may vary):

Follow these steps to add that webhook URL to your project settings:

  1. Open the Mage tool in your browser (e.g. http://localhost:6789/).

  2. Open a pipeline and start editing it (e.g. http://localhost:6789/pipelines/example_pipeline/edit).

  3. In your left sidebar in the file browser, scroll all the way down and click on a file named metadata.yaml.

  4. In the metadata.yaml file, add a section with the following configuration or update the existing notification_config section:

        - trigger_failure
        - trigger_passed_sla

    If you omit the alert_on section it will default to trigger_failure and trigger_passed_sla.


    • trigger_failure: alert when a run of a trigger fails
    • trigger_success: alert when a run of a trigger succeeds
    • trigger_passed_sla: alert when a SLA is missed.
      • In this context, SLA (Service Level Agreement) is an expected amount of time for the pipeline to complete.
      • If the pipeline runs longer than the SLA, an alert will be sent.
  5. In the metadata.yaml file, add the following values:

        webhook_url: ...

    Change the webhook_url value to be the webhook URL you created from Slack.

Customize message templates

You can customize message templates in notification_config. Here is an example config:

      details: >
        Failed to execute pipeline {pipeline_run_url}.
        Pipeline uuid: {pipeline_uuid}. Trigger name: {pipeline_schedule_name}.
        Test custom message."
      details: ...
      details: ...

You can customize the message template for success, failure, passed_sla scenarios. For each message template, you can specify either summary or details.

  • If you specify the summary, the slack message will be your summary + the url of the pipeline run page
  • If you specify the details, the details will be used as your slack message directly

To interpolate variables in the messaget template, you can use {variable_name} syntax. Hare are the supported variables: error, execution_time, pipeline_run_url, pipeline_schedule_id, pipeline_schedule_name, pipeline_uuid.

For pipeline_run_url, the default host is http://localhost:6789. You can specify MAGE_PUBLIC_HOST to be the host url you want to use in the notification messages.

What next?

Whenever a pipeline run is successfully completed or fails, a Slack message will appear in the channel you configured the webhook URL for.

Here is an example of what that message could look like: