yyqdbngt opened a new pull request, #2406:
URL: https://github.com/apache/rocketmq-dashboard/pull/2406

   ## Summary
   
   - validate a missing connection command before reading its address
   - map a null NameServer topology to an explicit 502 response
   - filter sparse broker rows and use monotonic time for probe latency
   
   ## Why
   
   The connection probe assumes both the command and returned topology are 
complete. Malformed boundary data currently produces generic NPE responses, and 
wall-clock adjustments can report negative latency.
   
   ## Tests
   
   - `mvn -q -f server/pom.xml -Dtest=ClusterConnectionServiceTest test`
   


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