This issue was caused by a conflict between the new JSON module in elixir 1.18.0 and the vendored JSON module in the rmq source.
My fix is a workaround that renames the vendored module to JSONOLD to avoid this conflict - the Elixir version is not a drop in replacement for the built in version. ** Changed in: rabbitmq-server (Ubuntu) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2097790 Title: --formatter json broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rabbitmq-server/+bug/2097790/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs