We are investigating issues with CDF-hosted Streamlit apps, where apps get the error ModuleNotFoundError: No module named 'ssl'
We are investigating the issue. The issue can affect all users of Streamlit apps regardless of which CDF clusters they are hosted in. In the meantime, explicitly adding the "ssl" module to your app's Python requirements can fix the immediate problem and is worth trying as a workaround.

Note: CDF-hosted Streamlit apps are in public preview and are not yet in production.