Phoenix500526 commented on issue #23400:
URL: https://github.com/apache/datafusion/issues/23400#issuecomment-4936280944

   I investigated the merge-group run for #23324.
   
   The merge queue did not remove the PR after a successful CI run. It removed 
it after [attempt 1 of the Rust 
workflow](https://github.com/apache/datafusion/actions/runs/28968722623/attempts/1)
 failed on merge-group commit 
[301e684](https://github.com/apache/datafusion/commit/301e684b583fb2d3661f73c6489f81891f1150aa).
   At 19:16:38 UTC, four required jobs were marked as failed:
    
   * cargo test doc (amd64)
   * cargo check datafusion-substrait features
   * verify benchmark results (amd64)
   * Run sqllogictest in Substrait round-trip mode
   
   Their logs show that the RunsOn runners received shutdown signals. GitHub 
removed the PR from the merge queue at 19:17:05.
   
   The RunsOn bot started [attempt 
2](https://github.com/apache/datafusion/actions/runs/28968722623/attempts/2) at 
19:22:40, after the PR had already been removed. That retry passed, and GitHub 
now displays the latest attempt, which is why the checks currently appear green.
   
   The affected runners were Spot instances, so this was likely a transient 
runner interruption, although RunsOn or CloudWatch logs would be needed to 
confirm the underlying infrastructure event.
   
   Therefore, the merge queue did not reject a successful run. It reacted to 
the failed first attempt, while the UI now shows the successful retry. 
Re-adding the PR created a new merge-group run, which passed and merged 
successfully.
   
   


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