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<li>Extended RabbitMQ channel heartbeat interval to 1h. This will suffice even for
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longer garbage collection cycles that may happen during replica set start-up.</li>
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+ <li>Using explicit ("manual") RabbitMQ message delivery acknowledgements for initial
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+ load when starting up a replica, combined with a "prefetch" (basicQos) value of 1.
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+ This way, when the replica is processing data
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+ and doesn't read fast enough, the RabbitMQ server will wait for the next message
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+ confirmation before sending more messages. This avoids socket buffer overflows
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+ which previously could lead to the RabbitMQ server timing out trying to send
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+ messages to the replica's channel.</li>
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</ul>
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<h2 class="articleSubheadline">December 2025</h2>
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