public RegionStatistics getCurrentStatistics() {
    return (RegionStatistics) currentStatistics.get();
  }
RegionCache caches the RegionHeartbeatSamples of a Region. Update and cache the current
statistics of the Region based on the latest RegionHeartbeatSample.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/load/cache/region/RegionCache.java