new_contents: #!/usr/bin/env python
  #
  # logfile_values.py
  #
  # Copyright (c) 2017, InnoGames GmbH
  #
  """
  logfile_values.py -- a python script to find metrics values in log file
  
  This script is using last line of log file to get metric value by column number
  
  python logfile_values.py --metric="metric1:1" --metric="metric2:2" ...
  """
  
  from argparse import ArgumentParser, ArgumentTypeError
  from time import time
  
  
  class Metric:
      def __init__(self, arg):
          if ':' not in arg:
              raise ArgumentTypeError('Argument must have ":"')
          self.name, column = arg.split(':', 1)
          if not column.isdecimal():
              raise ArgumentTypeError('Column must be a number')
          self.column = int(column)
  
  
  def parse_args():
      parser = ArgumentParser()
      parser.add_argument('--prefix', default='logfile_values')
      parser.add_argument('--file', default='/var/log/messages')
      parser.add_argument('--metric', type=Metric, action='append')
      return parser.parse_args()
  
  
  def main():
      args = parse_args()
      template = args.prefix + '.{} {} ' + str(int(time()))
      with open(args.file, 'r') as f:
          for line in f:
              pass
          last_line = line.split()
      for m in args.metric:
          print(template.format(m.name, last_line[m.column]))
  
  
  if __name__ == '__main__':
      main()
  
subject: Add plugin to parse values from log file