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[reconfigurator] Ability to switch reads from one clickhouse installation to another #7420

@karencfv

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@karencfv

Once #7419 has been implemented we'll need to have the ability to decide whether to read from a replicated cluster or a single node.

We'll use DNS for swapping reads. We can have a higher level SRV record that points to another SRV record and swap that over via OMDB. Then we can use a policy to make the change in reconfigurator.

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