rabbitmq-server 3.7+ is available in the default archives since focal:
rabbitmq-server | 3.6.10-1 | bionic | source, all rabbitmq-server | 3.6.10-1ubuntu0.5 | bionic-security | source, all rabbitmq-server | 3.6.10-1ubuntu0.5 | bionic-updates | source, all rabbitmq-server | 3.8.2-0ubuntu1~ubuntu18.04.1 | bionic-backports | source, all rabbitmq-server | 3.8.2-0ubuntu1 | focal | source, all rabbitmq-server | 3.8.2-0ubuntu1.3 | focal-security | source, all rabbitmq-server | 3.8.2-0ubuntu1.3 | focal-updates | source, all rabbitmq-server | 3.8.9-2 | hirsute | source, all rabbitmq-server | 3.8.9-2ubuntu0.1 | hirsute-security | source, all rabbitmq-server | 3.8.9-2ubuntu0.1 | hirsute-updates | source, all rabbitmq-server | 3.8.9-3ubuntu1 | impish | source, all
rabbitmq-server 3.7+ is available in the default archives since focal:
rabbitmq-server | 3.6.10-1 | bionic | source, all ubuntu18. 04.1 | bionic-backports | source, all
rabbitmq-server | 3.6.10-1ubuntu0.5 | bionic-security | source, all
rabbitmq-server | 3.6.10-1ubuntu0.5 | bionic-updates | source, all
rabbitmq-server | 3.8.2-0ubuntu1~
rabbitmq-server | 3.8.2-0ubuntu1 | focal | source, all
rabbitmq-server | 3.8.2-0ubuntu1.3 | focal-security | source, all
rabbitmq-server | 3.8.2-0ubuntu1.3 | focal-updates | source, all
rabbitmq-server | 3.8.9-2 | hirsute | source, all
rabbitmq-server | 3.8.9-2ubuntu0.1 | hirsute-security | source, all
rabbitmq-server | 3.8.9-2ubuntu0.1 | hirsute-updates | source, all
rabbitmq-server | 3.8.9-3ubuntu1 | impish | source, all