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Netflix has Chaos Monkey. The purpose is to find unexpected flaws and risks.

One major issue and you stop artificially inserting errors, which are inserted at a rate such that you could turn off the error inserted within some timely manner and still stay within budget.

My understanding is that they don't bring the service to exactly the SLO... To prevent overreliance on a service, it can be sufficient to introduce some level of failure, which may still be well above the SLO.

http://danluu.com/google-sre-book/#chapter-4-service-level-o...