The pattern for past large google outages has been:
1. Some networking-related service has global, non-standard (compared to the rest of the company) configuration
2. The relevant VP is aware and has decided not to change it because that change is quoted as impossible
3. Some change elsewhere happens that assumes standard configuration
4. The networking service breaks and causes a global outage
5. VP is told to fix it
6. Fix rolls out in weeks, because it wasn't as hard as they said before
