Hello
This is exactly the reason why you need to track the age of the oldest 
transaction on the primary itself and on every replica that has 
hot_standby_feedback = on. By default hot_standby_feedback is disabled.

> Is there anything I can do short of shutting down and restarting the primary 
> (production system) that would allow the backend_xmin to move forward?

You need to investigate this replica. Not a primary database. What transactions 
are in progress? Is it reasonable? Is hot_standby_feedback really needed here 
and is it reasonable to pay for its impact across the entire cluster?
In my practice, hot_standby_feedback = on is only needed on replicas intended 
for fast OLTP queries. And where any long requests are prohibited. 

regards, Sergei


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