code: public static void setDefaultStorageFileProvider ()
    {
      setStorageFileProvider (aMetadata -> {
        final LocalDateTime aNow = PDTFactory.getCurrentLocalDateTime ();
        final String sFilename = StringHelper.getConcatenatedOnDemand (PDTIOHelper.getLocalDateTimeForFilename (aNow),
                                                                       "-",
                                                                       aMetadata.getErrorID ()) +
                                 ".xml";
        return WebFileIO.getDataIO ()
                        .getFile ("internal-errors/" +
                                  aNow.getYear () +
                                  "/" +
                                  StringHelper.getLeadingZero (aNow.getMonthValue (), 2) +
                                  "/" +
                                  sFilename);
      });
    }
docs: Set the default storage file provider. In case you played around and want to
  restore the default behavior.
  
  @see #setStorageFileProvider(IFunction)
  @since 8.0.3