gistfile1.rb

require 'active_support'  
class MyLogger < ActiveSupport::BufferedLogger
  SEVERITY_NAME = %w( DEBUG INFO WARN ERROR FATAL UNKNOWN )

  def custom_line(severity, message)
    # Customized Log Format!
    message = [Time.now.strftime("%Y-%m-%d %H:%M:%S"), ENV['BL_JOB_ID']||$$, SEVERITY_NAME[severity], message].join("\t")
  end
  
  def add(severity, message = nil, progname = nil, &block)
    return if @level > severity
    message = (message || (block && block.call) || progname).to_s
    # If a newline is necessary then create a new message ending with a newline.
    # Ensures that the original message is not mutated.
    message = "#{message}\n" unless message[-1] == ?\n
    message = custom_line(severity, message) # <== CUSTOMIZED
    buffer << message
    auto_flush
    message
  end
end