How does Deployment Monitor Dashboard suppress time range messages?

This code serves pretty well. I believe the Deployment Monitor app uses the same thing or something very similar. Paste this into /etc/apps/<appname>/appserver/static/application.js. You may have to create the file if the given app doesn't have one already, and you have to do it in every app that you need the suppression in.

/**
 * Customize the message module so it wont constantly be telling the user that
 * lookup tables have been loaded and written to.
 * Unfortunately this is the least evil way I was able to find to
 * override the message handling.
 */
if (Splunk.Module.Message) {
    Splunk.Module.Message= $.klass(Splunk.Module.Message, {
        getHTMLTransform: function($super){
            // Please dont tell me any 'info' about lookups, nor 'error' about entityLabelSingular, etc...
            // Thank you that is all.
            var argh = [
                {contains:"lookup", level:"info"},
                {contains:"Results written to", level:"info"},
                {contains:"entityLabelSingular", level:"error"},
                {contains:"auto-finalized", level:"info"},
                {contains:"Your timerange was substituted", level:"info"},
                {contains:"Specified field(s) missing from results", level:"warn"}
            ];
            for (var i=0,len=this.messages.length; i<len; i++){
                var message = this.messages[i];
                for (var j=0,jLen=argh.length;j<jLen;j++) {
                    if ((message.content.indexOf(argh[j]["contains"])!=-1) && (message.level == argh[j]["level"])) {

                        this.messages.splice(i,1);
                        break;
                    }
                }
            }
            return $super();
        }
    });
}