public void updateServerStats(ServerName serverName, byte[] regionName, Object r) {
    if (!(r instanceof Result)) {
      return;
    }
    Result result = (Result) r;
    RegionLoadStats stats = result.getStats();
    if (stats == null) {
      return;
    }
    updateRegionStats(serverName, regionName, stats);
  }
A container class for collecting details about the RPC call as it percolates.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/MetricsConnection.java