Success and Failures of Alpha/Beta release

We have been building a new digital product (cross-platform mobile app) from the ground up and through the prototyping and development phases we have conducted user studies on the usability of the product.

Now we are at the point where we have a minimum viable product ready for an Alpha and Beta release. and I'm thinking of 1. distributing tasks to be performed in app on a daily basis and 2. distributing a questionnaire/survey type document to facilitate feedback from participants.

My question, as the Product Designer, is how do I best measure the success and failures of the Alpha/Beta release versions?