StepFlow.Amqp.CommonEmitter.publish

You're seeing just the function publish, go back to StepFlow.Amqp.CommonEmitter module for more information.
Link to this function

publish(queue, message, options \\ [], exchange \\ "job_submit")

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Publish a message.

Example:

StepFlow.Amqp.CommonEmitter.publish_json("my_rabbit_mq_queue", "{\"key\": \"value\"}")