@Override
  public OperationTimer labels(final String... labels) {
    final var ddp = histogram.labelValues(labels);
    return () -> ddp.startTimer()::observeDuration;
  }
An implementation of Besu simple timer backed by a Prometheus histogram. The histogram samples
durations and counts them in configurable buckets. It also provides a sum of all observed values.
metrics/core/src/main/java/org/hyperledger/besu/metrics/prometheus/PrometheusSimpleTimer.java