Neutron (by means of horizon) allocates floating IPs from the new transport network 188.8.131.52/29.
This allocation just happened to me:
184.108.40.206 tools-docker-registry-03 172.16.7.216
We should only allocate IPs from the right pool, which is cloud-eqiad1-floating 220.127.116.11/25 .
Since Horizon/Neutron don't allow to mark subnets/nets as available for allocation or not, the solution is to manually modify the subnets to mark as fully used (and therefore no allocation is possible).