EEM - Generate a customized syslog message

In order to generate a customized syslog message, you can use EEM (Embedded Event Manager). This is a Cisco tool. It helps to monitor events and generates an action when an particular event occur. In my case, I would like generate a customized Cisco log message if my primary WAN link is down. This message will have an 'alerts' level with my own description. By default, if an interface goes down it will only generate a 'informational' message. The policy of my syslog server is to generate an email only if I receive an 'error' level message.
I monitor interface giga1/1. If this this interface goes down (log message), I generate my customized message. You can see below the configuration:


event manager applet WanMonitor
 event syslog pattern "Interface GigabitEthernet1/1, changed state to administratively down"
 action 1.0 syslog priority alerts msg "PRIMARY WAN LINK is DOWN on Core 1"