A summary of the issue and the browser/OS environment in which it occurs.
Technical details: No python datasource in the preview docker image redash 10. I have added REDASH_ADDITIONAL_QUERY_RUNNERS=redash.query_runner.python to the env file but it still does not show.
I’m not able to reproduce this right now. If there is an issue loading a data source, though, it should emit a log message. What do you see in the logs for your worker service(s)?
Also just to verify the syntax for the environment variable: