@Fokko @NielsZeilemaker I finally figured out what is going on here, and it's
not a bug. 😬 Those strings with additional curly braces end up getting parsed
as template strings, formatted, and written out in `airflow.cfg`. So the source
default config has to contain something like `{{{{ filename }}}}.log` in order
to get the corresponding entry in `airflow.cfg` to be `{{ filename }}.log`.
Sorry for the false alarm.
[ Full content available at:
https://github.com/apache/incubator-airflow/pull/3435 ]
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