private void ensureClusterTableIsUpdated() {
        try {
            if (0 == engine().getTableStatus(new Path(), clusterTable.token())) {
                // Example: clusterTable.ensureColumnExists("write_rate", "float");
            }
        } catch (Exception e) {
            clusterTable.repair(e);
        }
    }
An implementation of the metrics Db backed by Quest:
This provides local persistent storage of metrics with fast, multi-threaded lookup and write,
suitable for production.

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