public Builder permanentSizeInc(long size, long operationTime) {
      this.permanentSize += size;
      if (operationTime != Utils.Infinite_Time) {
        long d = time.milliseconds() - operationTime;
        for (Pair<Long, AtomicLong> p : deltas) {
          if (p.getFirst() >= d) {
            p.getSecond().addAndGet(size);
          }
        }
      }
      return this;
    }
Increment {@link DeleteTombstoneStats#permanentSize} by the given size, as well as the other permanent size based on time.
@param size The size to increment
@param operationTime The operation time of the delete tombstone
@return
ambry-api/src/main/java/com/github/ambry/store/DeleteTombstoneStats.java