anchor.diff:  # NOTIFICATION SCRIPT
   #
   # sentinel notification-script <master-name> <script-path>
  -# 
  +#
   # Call the specified notification script for any sentienl event that is
   # generated in the WARNING level (for instance -sdown, -odown, and so forth).
   # This script should notify the system administrator via email, SMS, or any
  
positive.code: # When the failover starts, ends, or is aborted, a script can be called in
  # order to perform application-specific tasks to notify the clients that the
  # configuration has changed and the master is at a different address.
  # 
  # The script is called in the following cases:
  #
  # Failover started (a slave is already promoted)
  
negative.code: #
  # <state> is "start", "end" or "abort"
  # <role> is either "leader" or "observer"
  #
  # The arguments from-ip, from-port, to-ip, to-port are used to communicate
  # the old address of the master and the new address of the elected slave
  # (now a master) in the case state is "start" or "end".
  