I always find the postmortem of a major tech outage interesting. Ever since Google had a major outage with Maps, etc, I've been going back[0] to check for their breakdown of why they had the outage. Both the technical reason and the way it is explained is always something I'm interested in - like getting a peek behind the curtain, without a chance to see any details.

[0] https://status.cloud.google.com/maps-platform/incidents/8yNk...