public int getMetricsServiceWorkerQueueSize() {
    return Integer.parseInt(getProperty(METRIC_RETRIEVAL_SERVICE_THREADPOOL_WORKER_QUEUE_SIZE));
  }
Gets the queue size of the worker queue for the
{@link MetricsRetrievalService}.

@return the worker queue size, or {@code 10 *}
        {@link #getMetricsServiceThreadPoolMaxSize()} if not specified.
ambari-server/src/main/java/org/apache/ambari/server/configuration/Configuration.java