synchronized void decrementLowRedundancyBucketCount() {
    if (lowRedundancyBuckets == 0) {
      return;
    }
    lowRedundancyBuckets--;
    stats.incLowRedundancyBucketCount(-1);
    if (lowRedundancyBuckets == 0) {
      lowestBucketCopies = targetRedundancy + 1;
      logger.info("Configured redundancy of " + (targetRedundancy + 1)
          + " copies has been restored to " + regionPath);
    }
  }
Decrements the count of buckets that do not meet redundancy
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionRedundancyTracker.java