k9s from isv:Rancher:Harvester:ExtraPackages:v1.4 project
Select Your Operating System
Add repository and install manually
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:Rancher:Harvester:ExtraPackages:v1.4/15.5/isv:Rancher:Harvester:ExtraPackages:v1.4.repo zypper refresh zypper install k9s