Upgrade guides are available for:
Upgrade Scylla Enterprise from 2017.1.x to 2018.1.y on Red Hat Enterprise Linux and CentOS
Upgrade Scylla Enterprise from 2017.1.x to 2018.1.y on Ubuntu
Upgrade Scylla Enterprise from 2017.1.x to 2018.1.y on Debian
Scylla Enterprise Metrics Update - Scylla 2017.1 to 2018.1