Enjoyed this article from Intuit on running Gameday simulations for incident practice: https://medium.com/intuit-engineering/intuit-runs-gameday-simulations-to-test-resilience-of-critical-business-systems-and-apps-at-scale-7861223d526f

Mandi Walls at PagerDuty has a great talk about game days, I first saw it at Chaos Carnival but this video is from a preso she did with POZnan. I appreciated that she touched on the community and culture aspect of it rather than it being wholly ops-centric. In the platform space, it's too easy to think that your tooling and systems are the whole of your remit. Really, though, asking your developers and other stakeholders what they need to successfully, reliably, and repeatedly get to production and stay there in a performant way is the first task any platform team should complete. She covers some of those things as metrics when talking about game days.