Puma and sidekiq are using slightly more memory than it should be using. Let's see what happens when moving from cedar-14 to heroku-16.
$ heroku stack:set heroku-16
Stack set. Next release will use heroku-16.
Run git push heroku master to create a new release https://mastodon.zunda.ninja/media/p8VR4hUvvRlfHHnz7VM
Well, promotion on the pipeline did not update the stacks.