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(redis) job status events - Verdi emits job state changes back to mozart
(rabbitmq) job descriptors - Verdi gets the next job popped off the queue
(rabbitmq) control messages - Verdi gets a control command such as revoke a running job.
At the end of each job, if datasets are created to be ingested back into GRQ datasets catalog, then at the end of each job, there are periodic calls to submit percolator jobs to evaluate if there are any production rules that acts on that dataset type just ingested.
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