Document NLB considerations for istio gateway migration
Motivation
Migrating to operatorless istio will necessitate recreating the customer's gateways. Depending on a customer's cluster-external configuration, this may require DNS changes. This change needs to be documented.
Acceptance Criteria
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The istio 3.0 migration docs must call out the downtime that may result from the gateways being recreated
Edited by kipten