Hi, I understand you want to stop one of your domains from requesting a health check.Please correct me if I misunderstood.
You can configure Route 53 health checks against any public resource.You application is receiving health checks requested from Route 53 ,this may be cased by the following:
1)A health check was mistakenly configured against your application by another customer.
2)A health check was configured from your account for testing purposes but wasn't deleted when testing was complete.
3)The Elastic Load Balancing service updated its public IP addresses due to scaling, and the IP addresses were reassigned to your load balancer.
I would recommend you either do one of the methods :
1)Find the unwanted health check from the Route 53 console, from the correspondence I can see that it has an ID [34c5ddc8-761f-481f-83e1-5d5d91aefb36], you can follow the detailed steps "To view the status of a health check (console)" listed in AWS documentation .
2)Delete or block the source of unwanted requests.
3)For further assistance you can contact AWS Customer Support, follow link 
I hope this was helpful!
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