What are the DNS servers being used for? The request flow says that the request hits your load balancer (HAProxy) which is updated every 60s using Consul templa

What are the DNS servers being used for? The request flow says that the request hits your load balancer (HAProxy) which is updated every 60s using Consul templates. They also say that DNS records are updated every 60s using Consul templates. But when are the DNS servers used for service discovery if external requests always hit the load balancer (HAProxy)?