Comment 63 for bug 1789177

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Corey Bryant (corey.bryant) wrote : Re: RabbitMQ fails to synchronize exchanges under high load

The same issue exists in bionic-updates. Since it's already in updates you have to downgrade some neutron units (neutron-api and neutron-gateway in my case) to python-oslo.messaging=5.35.0-0ubuntu1 and restart neutron services in order to have the mismatched versions to recreate.