@Override
  public ByteBuffer processCommand(RequestReader request, Protocol protocol, Cache cache) {
    if (protocol == Protocol.ASCII) {
      return asciiCharset.encode(Reply.OK.toString());
    }
    return request.getResponse();
  }
This command is currently no-op

"verbosity" is a command with a numeric argument. It always succeeds, and the server sends
"OK\r\n" in response (unless "noreply" is given as the last parameter). Its effect is to set the
verbosity level of the logging output.
geode-memcached/src/main/java/org/apache/geode/internal/memcached/commands/VerbosityCommand.java