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Hello, I would like to ask what to pay attention to, when someone wants to set up multiple PuppetDB instances (and point them to the same DB), and put them behind a proxy/load balancer, as mentioned in the documentation<http://docs.puppetlabs.com/puppetdb/1/scaling_recommendations.html#bottleneck-single-point-of-failure> . Can this cause some concurrency issues with the message queues?