yyqdbngt opened a new pull request, #3835:
URL: https://github.com/apache/rocketmq-dashboard/pull/3835

   ### Motivation
   
   The existing `AliyunConvertersLagTest` covers the breakdown-vs-aggregate 
dedup and the aggregate fallback when the breakdown is null. Three further 
shapes of the same conversion were untested.
   
   ### Changes
   
   - `nullTopicEntriesAndNullReadyCountsContributeZeroRows`: null topic rows 
and null ready counts still contribute a per-topic row with a zero lag.
   - `emptyTopicBreakdownUsesAggregateFallback`: a present-but-empty topic map 
(not null) falls back to the aggregate row.
   - `neitherBreakdownNorAggregateYieldsNoRows`: a data payload without 
breakdown or aggregate produces no rows.
   
   ### Verification
   
   ```
   mvn -B test -Dtest=AliyunConvertersLagTest
   [INFO] Tests run: 5, Failures: 0, Errors: 0, Skipped: 0
   [INFO] BUILD SUCCESS
   ```


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