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

return unless Rails.application.server?

def build_instrumentation_config
  {
    action_controller: true,
    action_view: Live::Constants::ACTION_VIEW,
    active_record: Live::Constants::ACTIVE_RECORD
  }.map do |key, value|
    key if value
  end.compact
end

Rails.configuration.after_initialize do
  if Rails.env.development?
    RailsSemanticLogger::Rack::Logger.logger.level = :info # useful for remaining log like "[Rack::Log] Started..."
    SemanticLogger.clear_appenders!
    Rails.logger.name = 'rails'
  end

  ActiveSupport::Notifications.subscribe('rolling.live_constant') do |event|
    constants = event.payload[:changes].map { |change| change[:constant] }
    if constants.intersection(%w[ACTIVE_RECORD ACTION_VIEW]).any?
      Semantic::Instrumentalizer.activate(*build_instrumentation_config)
    end
  end
end

Rails.autoloaders.main.on_load('ApplicationController') do
  SemanticLogger.clear_appenders!
  SemanticLogger.add_appender(io: $stdout, formatter: Rails.application.config.x.semantic.formatter.constantize.new)

  Rails.logger.info ' ', dimensions: Semantic::FancyDimensions.new(rails: '╔═╗', before: 1)
  Rails.logger.fatal 'Zeitwerk RELOAD!', dimensions: Semantic::FancyDimensions.new(rails: '╠█╣')
  Rails.logger.info ' ', dimensions: Semantic::FancyDimensions.new(rails: '╚═╝')

  Semantic::Instrumentalizer.activate(*build_instrumentation_config)
end