Documenting this feature is important because it will be the replacement for Maistra's multi-tenancy feature and be required for many customers to test OSSM3 or to migrate. We have also know that many customers choose to run multiple instance of a service mesh within a single cluster.

From an information architecture perspective, this could either be part of OSSM-8200 as an additional topology with multiple control planes or part of a "Scaling & Multi-tenancy" section.

Upstream documentation: https://istio.io/latest/docs/setup/install/multiple-controlplanes/

Related engineering/qe epic: https://issues.redhat.com/browse/OSSM-4025.

Note: Although there is upstream engineering work TBD, it is mostly test related and should not impact the functionality of the feature, thus it does not block documentation.

Note 2: This is also relevant for users who are using OpenShift Service Mesh 2 on the same cluster, as they may have to apply a similar procedure to an OSSM 2 instance if using cluster-wide. That can be documented in the migration guide though.