Ask: How did your teams develop your list of Core Events?

Core Events within Pendo are a powerful tool to measure the adoption and stickiness of your product's "Ah ha!" moments.  However, they do require your team to define what your product's Core Events are.

What methods did your teams use to decide upon your Core Events?  Did you search for data first before making the decision?  Or perhaps you started with an assumption based on your desired 'Ah ha's and looked to Pendo to validate your assumptions with the resulting data?  Maybe it was an iterative process over a few quarters?

I'm eager to hear about your processes and, perhaps, some lessons learned along the way.