docs: public static TreeSet<File> getLogFiles() {
  
          TreeSet<File> result = new TreeSet<>();
          for (File file : new File(CmsLogFileApp.LOG_FOLDER).listFiles()) {
              result.add(file);
          }
          for (String dir : getAdditionalLogDirectories()) {
              File file = new File(dir);
              if (file.exists()) {
                  if (file.isDirectory()) {
                      for (File child : file.listFiles()) {
                          if (child.canRead()) {
                              result.add(child);
                          } else {
                              LOG.error("Can not read " + child.getAbsolutePath());
                          }
                      }
                  }
              }
          }
          return result;
      }