BasPH opened a new issue #8255: Config value interpolation not working when set as environment variable URL: https://github.com/apache/airflow/issues/8255 **Apache Airflow version**: 1.10.10 **Kubernetes version (if you are using kubernetes)** (use `kubectl version`): **Environment**: - **Cloud provider or hardware configuration**: - **OS** (e.g. from /etc/os-release): - **Kernel** (e.g. `uname -a`): - **Install tools**: - **Others**: **What happened**: I set store_serialized_dags as an environment variable: `export AIRFLOW__CORE__STORE_SERIALIZED_DAGS=True`. The default value of `store_dag_code` is `%(store_serialized_dags)s`, so I expect it to now also be True. However, it's not (it's False). **What you expected to happen**: I expect store_dag_code to have the same value as store_serialized_dags. I think it's because the interpolation is applied to the value set in .cfg, but not when it's set via an env var. Will have to double check. <!-- What do you think went wrong? --> **How to reproduce it**: <!--- As minimally and precisely as possible. Keep in mind we do not have access to your cluster or dags. If you are using kubernetes, please attempt to recreate the issue using minikube or kind. ## Install minikube/kind - Minikube https://minikube.sigs.k8s.io/docs/start/ - Kind https://kind.sigs.k8s.io/docs/user/quick-start/ If this is a UI bug, please provide a screenshot of the bug or a link to a youtube video of the bug in action You can include images using the .md sytle of  To record a screencast, mac users can use QuickTime and then create an unlisted youtube video with the resulting .mov file. ---> **Anything else we need to know**: <!-- How often does this problem occur? Once? Every time etc? Any relevant logs to include? Put them here in side a detail tag: <details><summary>x.log</summary> lots of stuff </details> -->
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