RabbitMQ is a message broker that implements a messaging architecture for loosely coupled microservices. It routes messages between producers and consumers, keeping them in queues until they can be delivered. The broker exposes metrics for its main components, allowing comprehensive monitoring of message traffic and system performance. RabbitMQ runs as an Erlang runtime node and supports multiple protocols, including AMQP. Producers publish messages to exchanges, which route them to queues. Queues wait for consumers to be available before delivering the message. Monitoring RabbitMQ is crucial for ensuring application availability and performance. Key metrics include exchange performance, connection performance, queue performance, and resource utilization. By tracking these metrics, developers can identify issues and optimize their messaging setup.