On Tuesday morning I'm going to switch the OpenStack Keystone token
engine from UUID tokens to fernet tokens[0]. The changeover[1] will be
abrupt and cause all existing sessions to reset (e.g. if you're using
Horizon you'll have to log back in, and if you're in the middle of
creating a VM that creation will probably fail.) Should you encounter
this interruption, just try again in a few minutes and everything should
be fine.
The new tokens will generally behave the same from a user standpoint,
but will allow us to simplify and modernize things on our end a bit.
The switch will happen at 15:00 UTC on this Tuesday, 2020-02-18. That's
7AM, Pacific Coast time.
[0]
https://docs.openstack.org/keystone/pike/admin/identity-fernet-token-faq.ht…
[1]
https://phabricator.wikimedia.org/T243418