    //<feature logger>
    Ext.define('Ext.log.formatter.Default', {
        extend: 'Ext.log.formatter.Formatter',

        config: {
            messageFormat: "[{priorityName}][{callerDisplayName}] {message}"
        },

        format: function(event) {
            var event = Ext.merge({}, event, {
                    priorityName: event.priorityName.toUpperCase()
                });

            return this.callParent([event]);
        }
    });
    //</feature>