We provide [Cluster docs](https://gluu.org/docs/gluu-server/4.1/installation-guide/cluster/)
Cluster Manager is the only licensed product at Gluu. If you want a 30 day trial license for Cluster Manager, let us know.
The Kubernetes / Helm assets are open source, but support for Kubernetes is also commercial only.
Clustering is an enterprise requirement, and Gluu is not a charity for enterprise customers. If you're not an enterprise, you can restore a backup and live within 99.9% availability.
If you need 99.99% (i.e. going from 8 hours to 50 minutes downtime per year), there is usually a good business reason.