public synchronized MetricUpdater getOrCreateMetricUpdater(Map<String, String> dimensions) {
        if (metricUpdaters.containsKey(dimensions)) {
            return metricUpdaters.get(dimensions);
        }
        MetricUpdater metricUpdater = new MetricUpdater(this, dimensions);
        metricUpdaters.put(dimensions, metricUpdater);
        return metricUpdater;
    }
Metrics for config server.

@author Harald Musum
configserver/src/main/java/com/yahoo/vespa/config/server/monitoring/Metrics.java