What metrics matter the most for PLG SaaS companies that are working with partners and trying to show the impact of their ecosystem of service partners?

I love this question mainly because this is an underserved area. Partnerships at a PLG company are challenging, because customers can self-sign up without any touch point from Sales or partners, and there isn’t true visibility into the impact partners have on the revenue of the business. Ideally a PLG company should be able to show which partners have impact on which customer referrals and which partners are currently working with which customers. You need to be able to prove the impact Partnerships has on net new business as well as on retained revenue.