I assumed the new sign-up path for the user, which now asks for an email (earlier it did not use to do that) would not be required to be tracked as a "cohort" - a logical grouping that the business can try to measure and make sense of their behaviour.

Stakeholders said otherwise. My implementation got blocked from landing on production.

This will need downstream changes for reporting pages.

Phased rollout is also needed, my assumption based on initial conversations was that it'll be a one-shot deployment. Will need to figure out how to do phased deployment to a specific percentage of traffic.