How to get a summary from current navigator series of highcharts?

I have a highchart which shows tasks run during a period of time with a navigator. Is there a way to show a custom summary of all tasks showing number of success, failed or warning tasks along with the selected date range?

Note: As and when the navigator changes the summary is also updated. Here is my plunker

I read here that using setExtremes I can get navigator drop event but looks like I only get date and not other data fields.

xAxis: {
    type: 'datetime',
    gridLineWidth: 1,
    tickInterval: 1 * 3600 * 1000,
    dateTimeLabelFormats: {
        month: '%b %e, %Y'
    },
    events: {
        setExtremes: function(e) {

            if (e.trigger == 'navigator') {
                $scope.taskstatus = e.min + " - " + e.max;
            }

        }
    }
},

Expected summary

Update

I am using highstock 2.0.4 version in this I cannot find currentTarget which is present in my plunker

for highstock 2.0.4 version below is the setExtremes function which sometimes gives incorrect counts, please help

$scope.setExtremesCall = function(e) {
    if (e.trigger == 'navigator') {
        var ftasks = 0,
            stasks = 0,
            wtasks = 0,
            alltasks = [];
        var currentSeriesArr = e.target.series;
        angular.forEach(currentSeriesArr, function(obj) {
            var currdatapoints = obj.segments;
            if (currdatapoints.length > 0) {
                angular.forEach(currdatapoints, function(inrobj) {
                    var firstKey = $scope.getFirstKey(inrobj),
                        taskStatus = $scope.getJobStatus(inrobj[firstKey].color);
                    if (taskStatus != null) {
                        if (taskStatus == "FAILED") {
                            ftasks++;
                        } else if (taskStatus == "SUCCESS") {
                            if (stasks == 4)
                                $scope.a = 1;
                            stasks++;
                        } else if (taskStatus == "WARNING") {
                            wtasks++;
                        }
                    }
                });
            }
        });
        taskstatus = e.min + " - " + e.max + " " + ftasks + " Failed, " + stasks + " Success, " + wtasks + " Warning";
        console.log(taskstatus);
    }
}

$scope.getFirstKey = function(data) {
    for (elem in data)
        return elem;
}

$scope.getJobStatus = function(stat) {
    if (stat == "#8CC051")
        return "SUCCESS";
    else if (stat == "#FF2A00")
        return "FAILED"
    else if (stat == "#FFCC4E")
        return "WARNING";
    return null;
}