apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/entity/vo/ReleaseCompareResult.java/ReleaseCompareResult/addEntityPair
class ReleaseCompareResult:  public void addEntityPair(ChangeType type, KVEntity firstEntity, KVEntity secondEntity) {
    changes.add(new Change(type, new EntityPair<>(firstEntity, secondEntity)));
  }