JupyterHub log level not working as expected

Hi :wave:
I’m trying to figure out how I can suppress all the command output from Jupyterhub except for errors. Almost everything gets sent to stderr. I’ve set JupyterHub.log_level and Application.log_level to ‘ERROR’, but I still get this output on startup:

21:11:46.618 [ConfigProxy] info: Proxying http://*:8000 to (no default)
21:11:46.619 [ConfigProxy] info: Proxy API at
21:11:46.914 [ConfigProxy] info: 200 GET /api/routes
21:11:46.916 [ConfigProxy] info: 200 GET /api/routes
21:11:46.920 [ConfigProxy] info: Adding route / ->
21:11:46.921 [ConfigProxy] info: Route added / ->
21:11:46.922 [ConfigProxy] info: 201 POST /api/routes/

Where do the ConfigProxy logs come from, and is there a way to configure them?