Re persistence:
Are you asking about the RabbitMQ queues? They are durable.
Or are you asking if the messages in the queue are published as persistent?
They are not.
I am asking if you are using persistent queues in logstash. It is unclear under what circumstances you think logstash is losing messages. The at-least-once delivery model, along with persistent queues, should prevent message loss under most circumstances.
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