gitlab_registry_stats.rb

Project.all.map do |p|
  [
    p,
    total_size =  p.container_repositories.reduce(0) do | acc, cr |
      acc + cr.tags.reduce(0) do  |acc,t| acc + ((t.total_size || 0) / 1024.0 / 1024.0)
      end
    end
  ]
end.sort_by(&:last).reverse.map do |(p, total_size)|
    printf "%10.2f %s\n", total_size, p.name
  end;nil