Those Helm Charts are no longer maintained. But yes, that’s ksql server.
You can simply download ksql cli locally, or use kubectl exec/run to get an interactive shell using existing ksql-cli image, or otherwise submit queries to the server REST API, or even use Control Center
I need a KsqlDB deployment for Kubernetes with 3 instances in interactive mode. I think where for the KsqlDB Servers needs to communicate to each other. And I think there needs s.th. to configure in the helm charts.