@Override
    public String toString() {
        return advertisedResources() +
               " at cost $" + cost() +
               (fulfilment < 1.0 ? " (fulfilment " + fulfilment + ")" : "");
    }
The estimated cost of changing from the given current resources to this.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/AllocatableResources.java