After AWS introduced AppSync Events, I decided to revisit my old post on testing Event-Driven Architectures. This time, I use AppSync Events instead of Momento Topics to test my application end-to-end.

Learn how to easily mock external HTTP services in your Lambda functions using Stubr, a WireMock adaption in Rust, and Lambda extensions. Mocking allows team to build in isolation, reducing the need for coordination in shared non-production environments.

Learn how to use AWS CloudWatch Math Expressions to improve alarm accuracy when the metrics you track include missing data points. Missing data is common in metrics such as Lambda Errors or Lambda Invocations, and alarms on these metrics can behave weirdly at times. Never miss a beat again!