We moved away from raid6 a while back; update the host var to reflect
the current configuration.

These are used to signal the start of the document in a stream of many
documents. As Ansible only supports one YAML document per file this is
unnecessary. About a third of our YAML documents already lacked these.

en is the prefix for ethernet according to systemd.net-naming-scheme(7)

This is meant as a internal authenticated and encrypted network which we
can use for internal services, we don't want to expose to the internet
or when encryption is desired but not easily implementable.

Zabbix has been replaced by Prometheus for monitoring our services.

For all hosts we want to have a working fail2ban for sshd brute force
attempts through a group_vars/all. For some hosts an override is
required to enable postfix or dovecot jails.

In preparation of the move to gemini make it already run the
archive.archlinux.org frontend and the archive-uploader. So the
migration is done in steps.