void addDeleteRecord(Long offset) {
      isDeleted = true;
      deleteMessageOffsets.add(offset);
      if (putMessageOffsets.size() == 1 && deleteMessageOffsets.size() == 1) {
        isConsistent = true;
      } else if (deleteMessageOffsets.size() > 1) {
        isConsistent = false;
        duplicateDeletes = true;
      }
    }
Adds information about a delete record
@param offset the offset at which the delete record was found
ambry-tools/src/main/java/com/github/ambry/store/DumpLogTool.java