@Override
  public void postSync(final long timeInNanos, final int handlerSyncs) {
    source.incrementSyncTime(timeInNanos / 1000000L);
  }
Class used to push numbers about the WAL into the metrics subsystem. This will take a single
function call and turn it into multiple manipulations of the hadoop metrics system.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/MetricsWAL.java