176-scale-cluster: limit message dequeue to batch size

by infinitewarp
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https://github.com/cloudigrade/cloudigrade/pull/229 https://github.com/cloudigrade/cloudigrade/issues/176

scheduled task to conditionally scale up the houndigrade cluster

  • Verify that when there are more messages on the queue than the batch size limit, this process reads and dequeues only up to the configured limit number of messages.

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