Allow toggling auth for prometheus metrics #344
Merged
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Equivalent to jupyterhub/jupyterhub#2224.
Port of jupyter/notebook#5870
Prometheus metrics can potentially leak information about
the user, so they should be kept behind auth by default.
However, for many JupyterHub deployments, they would need
to be scraped by a centralized Prometheus instance that can not
really authenticate separately to each user notebook without
a lot of work. Admins can use this setting to allow unauthenticated
access to the /metrics endpoint.