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Background:
redhat.repo contains ui_repoid_vars variables.
Some details on how the ui_repoid_vars variable works can be found in bug#906554.

YUM based on DNF doesn't support this variable at the moment.
We think the behavior should stay as it is.
Commands such as `yum repolist` should show plain repoids without any additions that might make users think that the actual repoid is the whole string with vars.


Change request:
Change subscription manager to stop generating the ui_repoid_vars variables in redhat.repo (remove the lines completely from the file).
These records are not used and only trigger a warning in dnf.log.

Looks like it is fixed in the current and near future releases.

[root@localhost ~]# subscription-manager register --auto-attach
Registering to: subscription.rhsm.redhat.com:443/subscription
Username: [REDACTED]
Password: 
The system has been registered with ID: [REDACTED]
The registered system name is: [REDACTED]
Installed Product Current Status:
Product Name: Red Hat Enterprise Linux for x86_64 Beta
Status:       Subscribed

[root@localhost ~]# rpm  -qa subscription-manager
subscription-manager-1.27.15-1.el8.x86_64

[root@localhost ~]# cat /etc/yum.repos.d/redhat.repo | grep ui_repoid_vars

[root@localhost ~]# wc -l /etc/yum.repos.d/redhat.repo 
517 /etc/yum.repos.d/redhat.repo