public static ServerStatisticTracker create(Configuration conf) {
    if (
      !conf.getBoolean(HConstants.ENABLE_CLIENT_BACKPRESSURE,
        HConstants.DEFAULT_ENABLE_CLIENT_BACKPRESSURE)
    ) {
      return null;
    }
    return new ServerStatisticTracker();
  }
Tracks the statistics for multiple regions
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ServerStatisticTracker.java