private Optional<Integer> getIntervalMinutes() {
        Monitoring monitoring = getMonitoringService();
        return monitoring != null ?
                Optional.of(monitoring.getInterval()) : Optional.empty();
    }
Container cluster for metrics proxy containers.

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