This is one of 4 multi-cluster topologies we will eventually document (multi-primary, primary-remote, external-control plane and federation) under the general topic of "multi-cluster".

Community sail-operator documentation: https://github.com/istio-ecosystem/sail-operator/blob/main/docs/README.md#external-control-plane (note the pre-reqs earlier in the doc).

Upstream Istio documentation: https://istio.io/latest/docs/setup/install/external-controlplane/

Addition: Should also include instructions for configuring Kiali with this topology.