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.

28+
incidents
11+
years
13
organizations
/
sort

newsletter

Get the next incident.

One production failure case study every week. Read the pattern before it shows up in your own system.

5 results · filtered
topic: config
id
incident
org
date
duration
severity
tags
FM-026
The WAF Killswitch That Crashed the Older ProxyA global WAF testing-tool killswitch exposed an FL1 proxy bug, returning HTTP 500s for sites using the older proxy and Managed Ruleset.
Cloudflare
2025-12-05
25m
SEV-2
wafconfigproxy
FM-022
The Bot File That Crashed Cloudflare's ProxyA ClickHouse permissions change duplicated Bot Management feature rows, producing an oversized file that crashed Cloudflare proxy traffic paths.
Cloudflare
2025-11-18
5h 38m
SEV-1
configwafbot-management
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-023
Service Control quota update rejects APIsA quota policy update with blank fields crashed Google Service Control globally, causing 503s across Google Cloud, Workspace, and Security Operations APIs.
Google Cloud
2025-06-12
3h
SEV-1
configquotaspanner
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