public void writeLoadBalancer(LoadBalancer loadBalancer, LoadBalancer.State fromState) {
        NestedTransaction transaction = new NestedTransaction();
        writeLoadBalancers(List.of(loadBalancer), fromState, transaction);
        transaction.commit();
    }
Returns the instant after which a firmware check is required, if any.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java