docs: document how to republish event

Author: skrobul

docs/operator-guide/rabbitmq.md

@@ -62,6 +62,15 @@ kubectl -n openstack exec -it rabbitmq-server-0 -c rabbitmq -- rabbitmqadmin --v
 kubectl -n openstack cp rabbitmq-server-0:/tmp/test.json -c rabbitmq /tmp/test.json
 ```
 
+### Republish captured message
+
+1. Save the exact JSON body of the message/event into file (see commands above how to get that).
+2. Republish like this:
+
+```bash
+cat /tmp/full-unpacked.json|  kubectl -n openstack exec -it rabbitmq-server-0 -c rabbitmq -- rabbitmqadmin --vhost=ironic publish exchange=ironic routing_key=ironic_versioned_notifications.info
+```
+
 ### To dump, print, list-events, and requeue an openstack notifications rabbitmq queue
 
 use [OpenStack RabbitMQ Queue Dump Tool](https://github.com/rackerlabs/understack/tree/main/examples/openstack-notifications)