bryancall commented on PR #12733:
URL: https://github.com/apache/trafficserver/pull/12733#issuecomment-3614826428

   **Why limit to 1 retry:**
   
   The retry logic intentionally allows only one additional OS_DNS hook call 
rather than using `connect_attempts_max_retries`. This avoids a combinatorial 
explosion of connection attempts:
   
   - With 1 OS_DNS retry and `connect_attempts_max_retries=3`: up to 6 total 
connection attempts (2 addresses × 3 retries each)
   - If we used `connect_attempts_max_retries` for OS_DNS retries too: up to 12 
attempts (4 addresses × 3 retries each)
   
   The single retry gives the plugin one opportunity to provide an alternative 
address on connection failure, which matches what issue #12611 requested. This 
keeps latency bounded while still enabling the documented retry behavior.


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