Creating custom statistics

Can anyone share the appropriate way to publish statistics?

I have a build runner and I want to be able to publish statistics data to project/build statistics page, so that users of my plugin will be able to add new charts with the values I publish.

I found https://confluence.jetbrains.com/display/TCDL/Custom+Statistics , But I still dont understand what interfaces I need to implement/base classes to extend,

And also the format of the XmlGraphBean is unknown to me.

I couldn't find any examples about it.

Thanks!