int getLowRedundancyBuckets() {
    return lowRedundancyBuckets;
  }
Since consistency was last reached, provides the lowest number of copies of a bucket that have
been remaining across all the buckets in the region

@return the number of copies of the bucket with the least copies available
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionRedundancyTracker.java