RabbitMQ has a native built-in Prometheus plugin and by default it has granular metrics disabled. Granular metrics means per-queue/vhost metrics - detailed metrics that provide message lag and consumer info on a queue and vhost basis. You could enable granular per-object metrics but this is not recommended as the plugin becomes much slower on a large cluster and the label cardinality for your time series database could become high.

To solve this you could use the unofficial OSS RabbitMQ exporter written by kbudde that will allow you to have granular metrics enabled and also disable specific metrics that the native Prometheus plugin provides. The unofficial exporter refers to a mixed approach where you use the unofficial exporter for detailed metrics and disable all other metrics and use the native RabbitMQ Prometheus plugin for all other metrics.