fix(role): Unify var names

README.md

@@ -13,6 +13,8 @@ Currently deals exclusively with Linux machines.
 
 # Role Variables
 
+## Defined
+
 Per [defaults/main.yml](defaults/main.yml) this role is equipped to deal with Arch Linux and Debian.
 
 - `packages_linux_common_all_families`: Place package names in this list that are identical across all Linux flavors.
@@ -42,6 +44,12 @@ Per [defaults/main.yml](defaults/main.yml) this role is equipped to deal with Ar
       - 'paccache-hook'
     ```
 
+## Undefined
+
+From somewhere outside of this role the role expects the following variable to be set. This is used in more than one role, we suggest to define this as a host or group var. 
+
+- `landscape_quico__e_mail_default_recipient_addr_spec`: An e-mail address such as `alerting@example.com` rendered as an [RFC 2822](https://datatracker.ietf.org/doc/html/rfc2822#section-3.4.1) `addr-spec` string. This is the recipient e-mail address we'll use for system-generated e-mails.
+
 # Dependencies
 
 This role depends on the [kewlfft.aur](https://galaxy.ansible.com/ui/repo/published/kewlfft/aur/) Ansible collection to install packages from Arch User Repository on Arch Linux target machines.

tasks/maintenance-unattended-upgrades.yml

@@ -27,6 +27,6 @@
     path: '/etc/aliases'
     insertafter: 'EOF'
     regexp: '^root:.*'
-    line: 'root: {{ e_mail_notifications_addressee }}'
+    line: 'root: {{ landscape_quico__e_mail_default_recipient_addr_spec }}'
   notify:
     - 'Ensure that a Mail Transfer Agent is running with newest config'