private MetricSet getAdditionalDefaultMetrics() {
        return getAdmin()
                .map(Admin::getAdditionalDefaultMetrics)
                .orElse(empty());
    }
Container cluster for metrics proxy containers.

@author gjoranv
config-model/src/main/java/com/yahoo/vespa/model/admin/metricsproxy/MetricsProxyContainerCluster.java