High availability is a software design approach and implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period.

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Principles behind writing highly-available fault-resilient systems.

A system’s capacity for self-healing when a fault occurs is a key measure of achieving high availability. Recently, Twilio used Chaos Engineering to close the gap and eliminate the need for human intervention for common faults involving our core queueing-and-rate-limiting system, Ratequeue.