code: public static MetricsRecord createRecord(MetricsContext context, 
                                             String recordName) 
    {
      MetricsRecord metricsRecord = context.createRecord(recordName);
      metricsRecord.setTag("hostName", getHostName());
      return metricsRecord;        
    }
docs: Utility method to create and return new metrics record instance within the
  given context. This record is tagged with the host name.
  
  @param context the context
  @param recordName name of the record
  @return newly created metrics record