   {
      min: 0,
      title: { text: 'Number of requests' },
      opposite: false,
      reversedStacks: false
    }, {
      min: 0,
      title: {
        text: 'Active Users',
        style: { color: '#FFA900' }
      },
      opposite: true
    }
  ],
  series: [
    {
color: '#5E7BE2',
name: 'All',
data: requests[0],
tooltip: { yDecimals: 0, ySuffix: '', valueDecimals: 0 }
,type: 'area'},
    allUsersData
  ]
});

requestsChart.setTitle({
  text: '<span class="chart_title">Number of requests per se