MaxReplicas is the number of replicas for each region. Immutable, change should be made through pd-ctl after cluster creation Optional: Defaults to 3

The label keys specified the location of a store. The placement priorities is implied by the order of label keys. For example, [“zone”, “rack”] means that we should place replicas to different zones first, then to different racks if we don’t have enough zones. Immutable, change should be made through pd-ctl after cluster creation

StrictlyMatchLabel strictly checks if the label of TiKV is matched with LocaltionLabels. Immutable, change should be made through pd-ctl after cluster creation. Imported from v3.1.0

When PlacementRules feature is enabled. MaxReplicas and LocationLabels are not used anymore.