Little Lemur and Tough Tiger instances are virtual hosts (vhosts) located on a shared server, where other users' actions might affect the performance of the whole server. If a lot of users on the same server are frequently opening and closing many connections it will decrease the performance of the server.
To improve the reliability of shared servers, each IP is from now on limited to a maximum of 20 new connections per second.
Technical note: RabbitMQ connections are a lot more resource heavy than channels. Connections should be long lived while channels can be opened and closed more frequently.
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