new_contents: """
  Return the maximum xmin in the database 
  """
  import os
  import sys
  import stat
  import psycopg2
  IEM = psycopg2.connect(database='iem', host='iemdb', user='nobody')
  icursor = IEM.cursor()
  
  def check():
      icursor.execute("""
      SELECT datname, age(datfrozenxid) FROM pg_database
      ORDER by age DESC LIMIT 1
      """)
      row = icursor.fetchone()
  
      return row
      
  if __name__ == '__main__':
      dbname, count = check()
      if count < 200000000:
          print 'OK - %s %s |count=%s;200000000;215000000;220000000' % (count, 
                                                              dbname, count)
          sys.exit(0)
      elif count < 215000000:
          print 'WARNING - %s %s |count=%s;200000000;215000000;220000000' % (count, 
                                                              dbname, count)
          sys.exit(1)
      else:
          print 'CRITICAL - %s %s |count=%s;200000000;215000000;220000000' % (count, 
                                                              dbname, count)
          sys.exit(2)
subject: add script to track xmin in the database