I found this article in the technical documentation
https://docs.ifs.com/techdocs/22r2/070_remote_deploy/010_installing_fresh_system/010_planning_installation/007_middle_tier/010_overview/#instances

Which is saying
"The architecture allows one or many IFS Cloud installations to be deployed in the same Kubernetes cluster using a shared ingress proxy that routes the traffic to the correct namespace."

But there is no detailed description on how to share an ingress proxy to route the traffic to the correct namespace. We would appreciate you sharing more information on this with us. 

Thank you,
Geethanga.