When an Alert is triggered, run the following command.The following replacement variables are available <b>'<HOSTNAME>'</b>, <b>'<ALERTID>'</b>, <b>'<MESSAGE>'</b>, <b>'<FACILITY>'</b>, <b>'<PRIORITY>'</b>, <b>'<SEVERITY>'</b>.Please note that <b>'<HOSTNAME>'</b> is only available on individual thresholds.These replacement values can appear on the command line, or be gathered from the environment of the script.When used from the environment, those variables will be prefixed with 'ALERT_'.
