private static ClusterInfo getClusterInfoFromDimensions(Inspector dimensions) {
        return new ClusterInfo(dimensions.field("clusterid").asString(), dimensions.field("clustertype").asString());
    }
Call the metrics API on each host and aggregate the metrics
into a single value, grouped by cluster.
configserver/src/main/java/com/yahoo/vespa/config/server/metrics/ClusterDeploymentMetricsRetriever.java