public OptionalInt rackAwareNonOverlapCost() {
        return rackAwareNonOverlapCost;
    }
The rack-aware assignment non-overlap cost as configured via
{@link StreamsConfig#RACK_AWARE_ASSIGNMENT_NON_OVERLAP_COST_CONFIG}
streams/src/main/java/org/apache/kafka/streams/processor/assignment/AssignmentConfigs.java