why did @apollo/gateway support load balance?

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As the document mentioned, Apollo gateway need url to specific implementing service where request sent . But the implementing service is running on multi server which has multi IP. So why can't give a list of url to specific a single implementing service which use load balance .

No files, tests, or code entry points are named. Start by reviewing Apollo Gateway's service URL configuration and the issue's request for multiple IPs per implementing service; done requires a defined scope and acceptance criteria for load balancing across those endpoints.

Written by the indexing model from the issue text.