Client V3 will get unscope auth as no project provided. Unscope auth will make client get empty catalog back from keystone. This backport from ceilometer-client patch[1] and I verified it in my devstack. [1]https://review.openstack.org/#/c/169409/ Change-Id: I1fa5a5b1e9a40501dfbd563bf608d41eb4879bf8 Closes-Bug: #1522728