code: public String toRawString(char delimiter)
      {
          StringBuilder result = new StringBuilder();
          for (Entry<String, PerfCounter> e : Counters.entrySet()) {
              result.append(e.getKey())
                    .append(delimiter)
                    .append(e.getValue().toRawString(delimiter))
                    .append('\n');
          }
          return result.toString();
      }
docs: Gets the statistics as delimiter separated strings. Each line contains
  statistics for a single procedure. There might be multiple lines.
  
  @param delimiter Delimiter, e.g. ',' or '\t'
  @return