@Deprecated
  default Result postAppend(ObserverContext<? extends RegionCoprocessorEnvironment> c,
    Append append, Result result) throws IOException {
    return result;
  }
Called after Append
<p>
Note: Do not retain references to any Cells in 'append' beyond the life of this invocation. If
need a Cell reference for later use, copy the cell and use that.
@param c      the environment provided by the region server
@param append Append object
@param result the result returned by increment
@return the result to return to the client
@deprecated since 3.0.0 and will be removed in 4.0.0. Use
            {@link #postAppend(ObserverContext, Append, Result, WALEdit)} instead.
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java