parkhojeong commented on issue #64847:
URL: https://github.com/apache/airflow/issues/64847#issuecomment-4490667417

   @bbovenzi 
   Here's a quick demo of the notification UX I've been working on! 
   Happy to adjust the UX based on feedback.
   
   
https://github.com/user-attachments/assets/6dff0873-3834-4516-bc14-1bfa55f893ba
   
   
   <details>
   <summary> example_deadline_alert.py  </summary>
   
   ```py
   # Licensed to the Apache Software Foundation (ASF) under one
   # or more contributor license agreements.  See the NOTICE file
   # distributed with this work for additional information
   # regarding copyright ownership.  The ASF licenses this file
   # to you under the Apache License, Version 2.0 (the
   # "License"); you may not use this file except in compliance
   # with the License.  You may obtain a copy of the License at
   #
   #   http://www.apache.org/licenses/LICENSE-2.0
   #
   # Unless required by applicable law or agreed to in writing,
   # software distributed under the License is distributed on an
   # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   # KIND, either express or implied.  See the License for the
   # specific language governing permissions and limitations
   # under the License.
   
   from __future__ import annotations
   
   import datetime
   
   import pendulum
   
   from airflow.providers.standard.operators.hitl import ApprovalOperator
   from airflow.sdk import DAG, DeadlineAlert, DeadlineReference
   from airflow.sdk.definitions.callback import AsyncCallback
   
   
   async def notify_missed_deadline() -> None:
       """No-op callback for demonstrating deadline alert notifications."""
   
   
   with DAG(
       dag_id="example_deadline_alert",
       dag_display_name="Five second queued deadline",
       start_date=pendulum.datetime(2026, 1, 1, tz="UTC"),
       schedule=None,
       catchup=False,
       tags=["example", "deadline", "HITL"],
       deadline=DeadlineAlert(
           reference=DeadlineReference.DAGRUN_QUEUED_AT,
           interval=datetime.timedelta(seconds=5),
           callback=AsyncCallback(notify_missed_deadline),
           name="Five second queued deadline",
       ),
   ):
       ApprovalOperator(
           task_id="approve_deadline_repro",
           task_display_name="Approve deadline repro",
           subject="Approve the deadline alert repro",
           body=(
               "Leave this task unanswered for at least five seconds after 
triggering the Dag. "
               "The queued deadline should become missed while this HITL task 
remains pending."
           ),
           assigned_users=[{"id": "admin", "name": "admin"}],
       )
   
   ```
   
   </details>


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