@Override
  public Optional<RatisMetricRegistry> get(MetricRegistryInfo metricRegistryInfo) {
    return Optional.ofNullable(registries.get(metricRegistryInfo));
  }
Using RefCountingMap here because of potential duplicate MetricRegistryInfos.
iotdb-core/consensus/src/main/java/org/apache/iotdb/consensus/ratis/metrics/MetricRegistryManager.java