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.

29+
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.

1 result · filtered
topic: leap-year
id
incident
org
date
duration
severity
tags
FM-015
The Impossible Date That Broke Azure VM StartupA leap-day bug stopped new Azure VMs from joining the control plane globally, then a rushed recovery update disconnected VMs in seven clusters.
Microsoft Azure
2012-02-29
34h 15m
SEV-1
leap-yearvm-startupcertificate