Amazon MQ is a managed messaging service hosted on the AWS cloud, providing a managed ActiveMQ messaging service that routes messages between nodes in a distributed application. It supports several ActiveMQ versions and allows for easy migration to the cloud. Amazon MQ can help solve problems like integrating disparate systems and improving data reliability in dynamic environments. The service provides metrics such as MemoryUsage, ConsumerCount, ProducerCount, QueueSize, ExpiredCount, EnqueueCount, DequeueCount, HeapUsage, CPUUtilization, StorePercentUsage, and TotalMessageCount to monitor the performance and resource usage of messaging infrastructure. These metrics help ensure that message brokers are operating efficiently with plenty of resources at all times, and can be used to identify potential issues such as running out of heap memory or disk space.