Background

After this Rails change rails/rails@9c58a54 (included in 7.1+) some ActionView::LogSubscriber-generated logs have been split out into a separate ActionView::LogSubscriber::Start subscriber. Unfortunately, this breaks lograge's unsubscription code invoked here:

This has the effect of not silencing logs that were silenced in Rails 7.0.

Reproduction

Copy the following to repro.rb - it defines a minimal Rails app inline:

require 'bundler/inline'

gemfile(true) do
  source 'https://rubygems.org'

  gem 'rails', '~> 7.0.8'
  gem 'puma'
  gem 'lograge'
end

require 'action_controller/railtie'
require 'logger'

Rails.logger = Logger.new(STDOUT)

class App < ::Rails::Application
  config.eager_load = false
  config.lograge.enabled = true

  routes.append do
    root to: 'root#index'
  end
end

class RootController < ActionController::Base
  def index
    render plain: Rails.version
  end
end

App.initialize!

Rack::Server.start(app: App)

If we run ruby repro.rb and then curl the listening address (for me, curl http://0.0.0.0:9292) I see these logs with Rails 7.0.8:

I, [2024-01-24T20:44:02.287069 #47669]  INFO -- : method=GET path=/ format=*/* controller=RootController action=index status=200 allocations=1327 duration=1.25 view=1.20

whereas if I change 7.0.8 to 7.1.3 and follow the same process, I see these logs:

D, [2024-01-24T20:44:44.011525 #47740] DEBUG -- :   Rendering text template
I, [2024-01-24T20:44:44.011663 #47740]  INFO -- : method=GET path=/ format=*/* controller=RootController action=index status=200 allocations=2003 duration=2.32 view=2.27

N.B. the additional debug logging.