Chaos Monkey
Randomly kills instances. Forces app to be resilient to node loss. Runs during business hours (not 3am).
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Extensions
Chaos Kong (kills entire AZ/region). Latency Monkey (add delays). Netflix's Simian Army.
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Modern tools
Gremlin (managed). Chaos Toolkit. LitmusChaos (K8s). Falco. Test scenarios beyond node kill.