default long getRequestCount() {
    return getLiveServerMetrics().entrySet().stream()
      .flatMap(v -> v.getValue().getRegionMetrics().values().stream())
      .mapToLong(RegionMetrics::getRequestCount).sum();
  }
Returns the number of requests since last report
hbase-client/src/main/java/org/apache/hadoop/hbase/ClusterMetrics.java