Funnel elements are what makes magic happen in Groundhogg. We have thoughtfully designed a methodology for implementing custom actions & benchmarks which you can find below.
To see example implementations of some elements, you can see the implementation of the standard elements which come bundled with Groundhogg.
Groundhogg has generated a common extension template which you can use to develop custom integration for the Groundhogg. Detailed description for developing a custom plugin described in a further post.