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Actually this looks fairly normal. I have see in our environment upwards of 800+ connections.

To confirm if indeed these connections are growing and not being closed properly you could run the following command to get a count and run it over the course of a few days to see if the number is increasing or just rising and falling back:

rabbitmqctl list_connections|wc -l

Also the lack of Keystone connections can be explained by the fact that keystone only talks to RabbitMQ if you have enabled notifications. Otherwise unlike the other OpenStack components, Keystone does not rely on messages.

There is a known issue with RabbitMQ and OpenStack services with regards to keepalives:

This has caused issues with services especially when connections are severed by networking type timeouts.