I'm using Nagios and the check_mysql_health plugin to monitor my MySQL databases. I need to keep an eye on my Seconds_Behind_Master values in my replicated databases, but I am unable to use SHOW SLAVE STATUS in a subquery to get at that value specifically. Does anyone know another way to get at the value of the Seconds_Behind_Master values of my slave databases as a single value? For the check_mysql_health plugin to work I need to return just a single numeric value that will be monitored.
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