Observability

Modern distributed computer systems have given rise to a seeming unlimited set of ill-defined failure modes. So when something goes wrong, finding the root cause can be tough.

To make sense of this new paradigm, we need to shift mindset, moving from monitoring to observability — our ability to determine the internal states of our systems from their outputs.

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Fitness function-driven development

Test-driven development, or TDD, involves writing tests first then developing the minimal code needed to pass the tests. TDD is an established practice for feature development that can improve code quality and test coverage. What about other, non-functional requirements such as scalability, reliability, observability, and other architectural “-ilities”?