What do you see as an issue?
The documentation page https://airflow.apache.org/docs/apache-airflow/stable/howto/operator/external_task_sensor.html as a broken link https://airflow.apache.org/docs/apache-airflow/stable/_modules/airflow/example_dags/example_external_task_marker_dag.html
Solving the problem
The problem seems to be the version in the link (stable)
Anything else
No response
Are you willing to submit PR?
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