code: public Map<String, String> getTags() {
          Map<String, String> result = new HashMap<>();
  
          for (Map.Entry<String, String> entry : _tags.entrySet()) {
              String key = entry.getKey();
  
              if (!ReservedField.isReservedField(key)) {
                  result.put(key, entry.getValue());
              }
          }
          return Collections.unmodifiableMap(result);
      }
docs: Returns an unmodifiable collection of tags associated with the metric.
  
  @return  The tags for a metric. Will never be null but may be empty.