How to change the scale of an axis with HighChart

Question

I'm using HighChart to display the memory usage of some containers. The problem is that sometimes the scale is in K sometimes in M and sometimes with nothing (like the picture bellow):

And this is how I create my HighChart:

var cursor = Template.currentData();
    liveChart = Highcharts.chart(cursor.chart_id, {
        title: {
            text: 'Memory usage of the controlcontainers_mongo_1'
        },
        xAxis: {
            type: 'datetime',
        },
        yAxis: {
            title: {
                text: 'usage'
            }
        },
        tooltip: {
            formatter: function() {
                return '<b>' + this.series.name + '</b><br/>' + Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>';
            }
        },
        series: [{
            type: 'line',
            name: 'memory usage',
            data: []
        }]
    });

[EDIT] Maybe it could be helpful to see the entire graph so there is it:

This is my formatter if someone need it:

formatter: function() {
                 var usage = this.value;
                 if((usage >= 1000000)&&(usage < 1000000000)){
                   return (usage/1000000).toFixed(2) + "MB";
                 }else if (usage >= 1000000000) {
                   return (usage/1000000000).toFixed(2) + "GB";
                 }else{
                   return usage + "KB";
                 }
               }

Answer 1

You can round up the values in y-axis formatting function

  var cursor = Template.currentData(); liveChart = Highcharts.chart(cursor.chart_id, { title: { text: 'Memory usage of the controlcontainers_mongo_1' }, xAxis: { type: 'datetime', }, yAxis: { title: { text: 'usage' }, labels: { formatter: function() { //This will round the value, but you can do anything to this value now return this.value.toFixed(2); } }, }, tooltip: { formatter: function() { return '<b>' + this.series.name + '</b><br/>' + Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>'; } }, series: [{ type: 'line', name: 'memory usage', data: [] }] }); 

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