static List<String> addLabelValues(final List<String> labelValues, final String... values) {
    final var newList = new ArrayList<String>(labelValues.size() + values.length);
    newList.addAll(labelValues);
    Collections.addAll(newList, values);
    return newList;
  }
Add new values to an existing list of label values

@param labelValues existing list of label values
@param values the values to add
@return a new list with new values appended to the original list
metrics/core/src/main/java/org/hyperledger/besu/metrics/prometheus/PrometheusCollector.java