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How-to Guide for Slack Incoming Webhook notifications

Introduction

Slack Incoming Webhook notifier (:class:airflow.providers.slack.notifications.slack_webhook.SlackWebhookNotifier) allows users to send messages to a slack channel through Incoming Webhook <https://api.slack.com/messaging/webhooks>__ using the various on_*_callbacks at both the Dag level and Task level

Example Code:

.. code-block:: python

from datetime import datetime, timezone
from airflow import DAG
from airflow.providers.standard.operators.bash import BashOperator
from airflow.providers.slack.notifications.slack_webhook import send_slack_webhook_notification

dag_failure_slack_webhook_notification = send_slack_webhook_notification(
    slack_webhook_conn_id="slackwebhook", text="The dag {{ dag.dag_id }} failed"
)
task_failure_slack_webhook_notification = send_slack_webhook_notification(
    slack_webhook_conn_id="slackwebhook",
    text="The task {{ ti.task_id }} failed",
)

with DAG(
    dag_id="mydag",
    schedule="@once",
    start_date=datetime(2023, 1, 1, tzinfo=timezone.utc),
    on_failure_callback=[dag_failure_slack_webhook_notification],
    catchup=False,
):
    BashOperator(
        task_id="mytask", on_failure_callback=[task_failure_slack_webhook_notification], bash_command="fail"
    )