Comment # 13 on bug 1153687 from Fabian Vogt

(In reply to Michael Andres from comment #12)
> Zypper-1.14.43 will use openSUSE_Tumbleweed if product name is MicroOS and
> vendor is openSUSE. This should fix it for now.
> 
> Reopoen or ping me in case OBS actually implements something like Fabian
> suggested.

Reopening, but sadly not because it got implemented in OBS...
I installed Kubic recently and used zypper ar with obs://, but it failed:

f241:~ # zypper ar obs://devel:kubic dk
Guessed: platform = MicroOS_$releasever
Adding repository 'dk'
......................................................................................................................................................................................................................[done]
Repository 'dk' successfully added

URI         :
https://download.opensuse.org/repositories/devel:/kubic/MicroOS_20210408
f241:~ # rpm -q zypper
zypper-1.14.43-1.2.x86_64