At Google Cloud, we usually measure the following top level metrics:
• Partner Marketing Sourced Pipeline
• Number of QSOs (Qualified Sales Opps.) generated per partner per campaign
• MDF Utilisation %
• Closed Won $ sourced per partner
• Average Deal Size
If you have a mature partner program and want to dig deeper, you can measure your partner enablement efforts too:
• Are partners interacting with your marketing assets? How often?
• How often are partners logging into your partner portal?