delete2.rb

ClientApp.all.each do |client_app|
  config_vars = ['RUBY_GC_HEAP_GROWTH_MAX_SLOTS',
                 'RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR',
                 'RUBY_GC_MALLOC_LIMIT_MAX',
                 'RUBY_GC_OLDMALLOC_LIMIT_MAX']
  heroku = ::Heroku::API.new(api_key: ENV['HEROKU_API_KEY'])
  config_vars.each do |config_var|
    begin
      puts "setting #{config_var} on #{client_app.name}"
      heroku.delete_config_var(client_app.name, config_var) 
      sleep(3.5)
    rescue ::Heroku::API::Errors::RateLimitExceeded => e
      puts "rate limit exceeded, sleeping for 60"
      sleep 60
      retry
    rescue ::Heroku::API::Errors::NotFound => e
      puts "#{client_app.name} not found: #{e}"
      sleep(3.5)
    rescue ::Heroku::API::Errors::ErrorWithResponse => e
      puts "some other error like 503: #{e}"
      sleep(3.5)
      retry
    end
  end
end