double idealLoad() {
            // Stateless clusters are not expected to consume more disk over time -
            // if they do it is due to logs which will be rotated away right before the disk is full
            return clusterSpec.isStateful() ? idealContentDiskLoad : idealContainerDiskLoad;
        }
Returns the fraction of memory of the current allocation which is currently consumed by
fixed data structures which take the same amount of space regardless of document volume.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/ClusterModel.java