code: private void writeEvaluatorsWebOutput(final HttpServletResponse response) throws IOException {
  
      LOG.log(Level.INFO, "HttpServerReefEventHandler writeEvaluatorsWebOutput is called");
  
      final PrintWriter writer = response.getWriter();
  
      writer.println("<h1>Evaluators:</h1>");
  
      for (final Map.Entry<String, EvaluatorDescriptor> entry
          : this.reefStateManager.getEvaluators().entrySet()) {
  
        final String key = entry.getKey();
        final EvaluatorDescriptor descriptor = entry.getValue();
  
        writer.println("Evaluator Id: " + key);
        writer.write("<br/>");
        writer.println("Evaluator Name: " + descriptor.getNodeDescriptor().getName());
        writer.write("<br/>");
      }
      writer.write("<br/>");
      writer.println("Total number of Evaluators: " + this.reefStateManager.getEvaluators().size());
      writer.write("<br/>");
      writer.println(String.format("Driver Start Time:[%s]", this.reefStateManager.getStartTime()));
    }
docs: Get all evaluator ids and send it back to response so that can be displayed on web.
  
  @param response
  @throws IOException