easy-going-rails/config/initializers/semantic_logger.rb

RailsSemanticLogger::Rack::Logger.logger.level = :info # useful for remaining log like "[Rack::Log] Started..."
SemanticLogger.clear_appenders!

im = nil
# Zeitwerk reload message
Rails.autoloaders.main.on_load('ApplicationController') do
  SemanticLogger[:zeitwerk].debug('reload!')
  im = Semantic::InstrumentationManager.new
end

Rails.configuration.after_initialize do
  Rails.logger.name = 'error_trap'
  Semantic::InstrumentationManager.clear

  bootstrap = [{ kind: :restored, constant: 'ACTION_VIEW', type: :boolean, old_value: false, new_value: true },
               { kind: :restored, constant: 'ACTION_CONTROLLER', type: :boolean, old_value: false, new_value: true }]
  im ||= Semantic::InstrumentationManager.new
  im.process(bootstrap)

  ActiveSupport::Notifications.subscribe('rolling.live_constant') do |event|
    puts event.payload[:changes].inspect
    im.process(event.payload[:changes])
  rescue StandardError => e
    puts e
  end
end