@Override
    public HashMap<String,String> getDefaultMetricDimensions(){
        HashMap<String, String> dimensions = new HashMap<>();
        if (clusterName != null)
            dimensions.put("clustername", clusterName);
        return dimensions;
    }
Returns the jvm args set explicitly for this node
config-model/src/main/java/com/yahoo/vespa/model/container/Container.java