public ComponentMetricReporter addDimension(String key, String value) {
        defaultDimensions.put(key, value);
        defaultContext = impl.createContext(defaultDimensions);
        return this;
    }
Metric reporter wrapper to add component name prefix and common dimensions.
clustercontroller-utils/src/main/java/com/yahoo/vespa/clustercontroller/utils/util/ComponentMetricReporter.java