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Bug description
Logging in kubespawner prints out all environment variables on error. This includes sensitive values like the singleuser's API token and any other secrets being passed into the users pod.
https://github.com/jupyterhub/kubespawner/blob/main/kubespawner/spawner.py#L2745
Expected behaviour
Environment variables are not printed out/included in the logs.
Actual behaviour
Environment variables are printed out including anything sensitive.
How to reproduce
Have kubespawner fail to create a pod and enter a timeout exception, this will cause the logging line to fire.
Your personal set up
N/A