No. 005 · Wing of the Global Push

One Customer, One Setting

2021-06-08 · under an hour

1. 1A software change deployed weeks earlier carries a latent bug
2. 2One customer pushes a valid configuration change
3. 3The change triggers the bug across the edge network
4. 4Most of the network starts returning errors; major news sites go blank
5. 5Engineers find the config, disable it, and traffic recovers ✕

A bug can wait patiently for the one input that wakes it.

Source: Fastly blog, June 2021