This logger wrapper I wrote.

ensures_logger_broadcasts_to_stdout.rb

# Leverages the BroadcastLogger introduced in Rails 7.1 to wrap the current
# logger in a new logger that broadcasts to both the current logger and $stdout
#
# (Announcement: https://rubyonrails.org/2023/9/29/this-week-in-rails)
#
# If the current logger already broadcasts to $stdout, it will not be wrapped,
# making it safe to call this method multiple times without knowing the current
# logging "sitch".
#
# Usage probably looks something like this:
#
# > Rails.logger = EnsuresLoggerBroadcastsToStdout.new.call(Rails.logger)
#
class EnsuresLoggerBroadcastsToStdout
  def call(logger)
    loggers = logger.respond_to?(:broadcasts) ? logger.broadcasts : [logger]

    if loggers.none? { |logger| logging_to_stdout?(logger) }
      ActiveSupport::BroadcastLogger.new(
        ActiveSupport::Logger.new($stdout, formatter: Logger::Formatter.new),
        *loggers
      )
    else
      logger
    end
  end

  def logging_to_stdout?(logger)
    logdev = logger.instance_variable_get(:@logdev)
    logdev.respond_to?(:dev) && logdev.dev == $stdout
  end
end