title: Display count of grouped points on Highcharts dataGrouping
body: <p>I have a chart with some points which displays a value and they are sorted by datetime. I want to group the points by days and show the total number of points per day, not the sum of their values.</p>
  
  <p>Highcharts provides any option to display count of grouped points when I use <code>dataGrouping</code>? Or I have to do this operation with javascript or on server side?</p>
  
  <p>Thank you.</p>