Topple
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Guide
Case studies
Facebook disappears from the internet
October 2021. One maintenance command, and the tools to undo it go down too.
Circular dependencies
Recipes
The retry storm
A brief spike becomes a lasting outage once clients start retrying.
Queues, retries, dials
Cache stampede
The cache restarts and every read lands on the database at once.
Hidden load, what-if switch
The bad deploy
The same broken release, shipped all at once or to one server first.
Blast radius, groups
When DNS goes down
Healthy servers that nobody can find, and what a second provider changes.
Single points of failure
Failover that needs room
One region fails and the other has to carry everything.
Capacity planning, dials
How a rumor spreads
Not an outage. Three rules and one event, passed from person to person.
Rules, custom states
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