public ClusterTimeseries add(ClusterMetricSnapshot snapshot) {
        List<ClusterMetricSnapshot> list = new ArrayList<>(snapshots);
        list.add(snapshot);
        return new ClusterTimeseries(cluster, list);
    }
A list of metric snapshots from a cluster, sorted by increasing time (newest last).

@author bratseth
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/ClusterTimeseries.java