Amazon Builders' Library in Focus #6: Implementing Health Checks

The Amazon Builders' Library article discusses implementing health checks for scalable and resilient systems. The authors highlight the importance of balancing thorough health checks that quickly mitigate single-server failures with the harm of false positives that affect the entire fleet. They recommend using a combination of liveness, local, and dependency health checks to measure system health. However, they also caution against over-reliance on health checks, particularly when it comes to dependencies, as this can lead to cascade failures. The article also shares real-world examples of failures with health checks at Amazon and provides guidance on how to react safely to health check failures.