RabbitMQ is an open-source message-broker software that supports Streaming Text Oriented Messaging Protocol, Message Queuing Telemetry Transport, and other protocols.
Understand how many messages have been published to an exchange.
File descriptors used
As connections increase, you need to ensure you have enough file descriptors—otherwise, the node will block connections above the configured limit.
A high number of messages in the queue may indicate an issue.