code: void appendHtmlReport(StringBuilder sb) {
      sb.append("<table class=\"storage\">");
      sb.append("<thead><tr><td>JN</td><td>Status</td></tr></thead>\n");
      for (AsyncLogger l : loggers) {
        sb.append("<tr>");
        sb.append("<td>" + JspUtil.escapeXml(l.toString()) + "</td>");
        sb.append("<td>");
        l.appendHtmlReport(sb);
        sb.append("</td></tr>\n");
      }
      sb.append("</table>");
    }
docs: Append an HTML-formatted status readout on the current
  state of the underlying loggers.
  @param sb the StringBuilder to append to