Setup the new kafka hosts on the following public IP addresses:
128.93.166.48
128.93.166.49
128.93.166.50
128.93.166.51
Use the following hostnames:
broker1.journal.softwareheritage.org
broker2.journal.softwareheritage.org
broker3.journal.softwareheritage.org
broker4.journal.softwareheritage.org