When an incident occurs in prod and it affects the livelihood of 12.000 people (or more if you include family), you'd expect at the very least a post-mortem. I've never seen a company produce one after that.
What was the root cause? crazy hiring, massive wage war
Could the current situation be anticipated? hell yeah, out of a pandemic, war raging in Europe, petrol production going down, supply chain problems all over the world, resulting in inflation going massively up... Don't need an MBA to anticipate the economy was par for a correction.
what could you have done to prevent this? realize it was too good to be true. Don't enter the rat race, be cautious about hiring. Focus business.
what steps will you take in the future to prevent this from happening again? "I take responsibility" is a beautiful thing to say but it's completely empty if you don't take the consequences as well, and don't learn anything in the process. I bet you that if/when we recover from this dip, the same hiring practices as before will re-submerge so that resiliency doesn't move and we see the same move in another 5/10y. So I guess the answer to this question is "none, loyalty goes only one way and trust me when I tell you that no-one is safe"