Database load balancing: Document how the additional section processing for SRV records work
The following discussion from !15691 (merged) should be addressed:
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@tkuah started a discussion: We should probably document how the additional processing works, and most importantly hostnames that don't resolve gets dropped.
Also, I realise that this might drop SRV records that return IP adddresses in the answer section but it's not a valid use-case right now.