Introduction

Publishes messages to a RabbitMQ queue at a constant rate (messages per second) for the entire attack duration. For example, 5 messages/second over 60 seconds publishes 300 messages total.

For publishing a fixed total number of messages (distributed across the duration), use Publish (# of Messages) instead.

Use Cases

• Generate a steady stream of messages to simulate normal production load during fault injection.
• Create sustained queue backlog by publishing at a rate higher than the consumer can process.
• Combine with Check Queue Backlog to verify that consumers keep up under a known publishing rate.

Parameters

Parameter	Description	Default
Duration	How long the publisher runs at the specified rate. Total messages published = rate x duration.	30s
Messages per Second	The number of messages to publish per second. Min: 1, Max: 10.	1
Exchange	Optional. The AMQP exchange to publish to. Defaults to the default exchange (empty string), which routes directly to the queue.
Routing Key	Optional. The routing key used for message delivery. Defaults to the queue name if empty.
Message Headers	Optional. AMQP message headers to include in the message properties. Specified as key-value pairs.
Body	The message body. Every message uses this same value.	test-message
Success Rate	Minimum percentage of messages that must be published without errors for the action to succeed. If the actual success rate drops below this threshold, the experiment fails.	100%
MaxConcurrent	Maximum number of parallel publish requests in flight at once. Min: 1, Max: 10.	1