The library. Every incident, structured.
A growing archive of public postmortems, broken down into a consistent shape: what broke, why it cascaded, and what to take from it. New incidents added regularly.
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topic: cdn
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FM-024
Azure Front Door config crashes edge sitesIncompatible Azure Front Door customer metadata exposed a data-plane bug, crashing edge sites and causing connection timeouts and DNS errors globally.
Microsoft Azure
2025-10-29
8h 24m
SEV-1
configedgecdn
FM-005
The Valid Config Change That Broke 85% of FastlyA software release shipped 27 days earlier left a latent bug in Fastly's edge platform. A routine, valid customer configuration change triggered it and 85% of Fastly's network began returning errors within seconds.
Fastly
2021-06-08
~1h
SEV-1
cdnedge-networkconfig