We’ve released JupyterHub 2.1*.
It’s a small release, mostly with refinements to new features in JupyterHub 2.0 surrounding roles and scopes. Highlights:
- consistent behavior based on access permissions when attempting to access a non-running server that’s not yours (rather than the old behavior of redirecting to your own server sometimes).
 - add missing 
read:metricsscope needed for authenticated access to the metrics endpoint 
And more in the changelog.
Thanks to everyone who helped out!
* 2.1.1 because admins didn’t get the new read:metrics scope in 2.1.0