Occasionally, the scheduler, will stop returning logs. I think this code is part of the issue

https://github.com/apache/airflow/blob/f9b38d288621cb76f9ed43b16dad00d19654fdef/airflow-core/src/airflow/utils/log/file_task_handler.py#L167-L192

By default the time out is never.

Start with airflow-core/src/airflow/utils/log/file_task_handler.py lines 167-192, then trace how the default timeout is used when scheduler logs are fetched. Reproduce the case where log delivery stops and establish the expected behavior for an unset timeout; done means the failure is explained and covered by an appropriate regression test.

Written by the indexing model from the issue text.