@Override
  public LabelledMetric<Histogram> createLabelledHistogram(
      final MetricCategory category,
      final String name,
      final String help,
      final double[] buckets,
      final String... labelNames) {
    return getHistogramLabelledMetric(labelNames.length);
  }
Gets operation timer labelled metric.

@param labelCount the label count
@return the operation timer labelled metric
metrics/core/src/main/java/org/hyperledger/besu/metrics/noop/NoOpMetricsSystem.java