private static MetricSet getClusterControllerMetrics() {
        // Metrics needed for alerting
        return new MetricSet.Builder("default-cluster-controller")
                .metric(ClusterControllerMetrics.DOWN_COUNT.max())
                .metric(ClusterControllerMetrics.MAINTENANCE_COUNT.max())
                .metric(ClusterControllerMetrics.UP_COUNT.max())
                .metric(ClusterControllerMetrics.IS_MASTER.max())
                .metric(ClusterControllerMetrics.RESOURCE_USAGE_NODES_ABOVE_LIMIT.max())
                .metric(ClusterControllerMetrics.RESOURCE_USAGE_MAX_MEMORY_UTILIZATION.max())
                .metric(ClusterControllerMetrics.RESOURCE_USAGE_MAX_DISK_UTILIZATION.max())
                .build();
    }
Metrics for the 'default' consumer, which is used by default for the generic metrics api and
other user facing apis, e.g. 'prometheus/'.

@author gjoranv
@author yngve
metrics/src/main/java/ai/vespa/metrics/set/Vespa9DefaultMetricSet.java