private static Map<String, Object> makeSimpleServer(DruidServer input) {
   return new ImmutableMap.Builder<String, Object>()
       .put("host", input.getHost())
       .put("tier", input.getTier())
       .put("type", input.getType())
       .put("priority", input.getPriority())
       .put("currSize", input.getCurrSize())
       .put("maxSize", input.getMaxSize())
       .build();
 }