Amazon MQ for RabbitMQ now supports Prometheus metrics

[Amazon MQ](https://aws.amazon.com/amazon-mq/) for RabbitMQ now supports the Prometheus plugin on RabbitMQ 4.2 brokers, providing a native Prometheus-compatible metrics endpoint on your RabbitMQ brokers. You can scrape broker, queue, and connection metrics directly from your brokers using any Prometheus-compatible monitoring tool, giving you more flexibility in how you observe and alert on your messaging infrastructure. The plugin exposes metrics through the /metrics, /metrics/detailed, and /metrics/memory-breakdown endpoints in Prometheus text format. Amazon MQ also publishes a curated subset of these Prometheus metrics to CloudWatch. With the Prometheus plugin, you can now integrate your brokers into existing Prometheus-based monitoring stacks including Grafana dashboards, Amazon Managed Service for Prometheus, and self-hosted Prometheus servers. The Prometheus plugin is enabled by default on all Amazon MQ for RabbitMQ 4.2 brokers in all [AWS Regions](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/) where Amazon MQ is available. To learn more about monitoring with Prometheus, see the [Amazon MQ release notes](https://docs.aws.amazon.com/amazon-mq/latest/developer-guide/amazon-mq-release-notes.html).