@Override
  public Histogram createHistogram() {
    // create distributionSummary
    io.micrometer.core.instrument.DistributionSummary distributionSummary =
        new CumulativeDistributionSummary(
            null, clock, IoTDBDistributionStatisticConfig, 1.0, false);

    return new IoTDBHistogram(distributionSummary);
  }
The histogram config which is used to create IoTDBTimer and IoTDBHistogram
iotdb-core/metrics/core/src/main/java/org/apache/iotdb/metrics/core/IoTDBMetricManager.java