Comment 1 for bug 1586840

Related bug report: https://bugs.launchpad.net/nova/+bug/1586979

We hit this in a fresh Bifrost deployment this morning, and, so far as I can tell, it's going to affect every project that uses oslo.messaging (eg, Nova, Keystone, Ironic, ...) downstream, if someone installs that project with "pip install -r requirements.txt", because oslo.messaging specifies "amqp>=1.4.0".

It does not affect project gates because the gate environment uses upper-constraints, which currently pins "amqp===1.4.9".