public Builder addTarget(final RegionInfo regionInfo, final long regionSizeMb) {
      normalizationTargets.add(new NormalizationTarget(regionInfo, regionSizeMb));
      return this;
    }
A helper for constructing instances of {@link MergeNormalizationPlan}.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/MergeNormalizationPlan.java