code: private void printHeader(MetricType metricType, String name, String description) {
  		print("# HELP ");
  		print(METRIC_PREFIX);
  		print(name);
  		print(' ');
  		println(description);
  
  		print("# TYPE ");
  		print(METRIC_PREFIX);
  		print(name);
  		print(' ');
  		println(metricType.getCode());
  	}
docs: prints the HELP and TYPE rows