High memory use with RabbitMQ on RHEL9 hosts

If you run RabbitMQ on RHEL9 family hosts (CentOS Stream 9, RockyLinux 9, AlmaLinux 9) and you see 1.6GB memory use then consider limiting amount of file descriptors:

EL9 (both CentOS Stream 9 and Rocky Linux 9) have 1073741816 while CentOS Stream 8 has 1048576 - after lowering it's acceptable memory usage.

https://github.com/rabbitmq/erlang-rpm/discussions/104 for more