RabbitMQ message sizes

[Shivalika Chaudhary]

Hey!

I am using the RabbitMQ C++ client to pass messages between my applications.

I want to measure the size of the actual message being transferred or even total data bytes sent/received by the applications in a session.

I looked at the API docs and the Management UI, but I couldn't find anything.

Please help me with how to measure the same....

Thanks!

[Michal Kuratczyk]

Hi,

There are metrics related to the number of messages and bytes being transferred so perhaps you can get the average you want from the Prometheus endpoint: https://github.com/rabbitmq/rabbitmq-server/blob/master/deps/rabbitmq_prometheus/metrics.md. You probably need to use per-object metrics (disabled by default): https://www.rabbitmq.com/prometheus.html#metric-aggregation. By the way, in the most recent RabbitMQ versions you don't need to set this parameter - you can scrape /metrics/per-object regardless of what the value of `prometheus.return_per_object_metrics`. Given quite a bit of performance overhead of per-object metrics, assuming you don't need to observe that average size all the time, you can monitor RabbitMQ metrics using /metrics with aggregated metrics only and use /metrics/per-object when you need the details.

Best,

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Michał

RabbitMQ team