Real traffic exposes wrong assumptions in code, which cannot be caught with unit or integration testing. Awesome to automate this kind of testing. I encourage p

Real traffic exposes wrong assumptions in code, which cannot be caught with unit or integration testing. Awesome to automate this kind of testing. I encourage people to invest heavily in setting up artificial environments to replay historical data. One benefit of the artificial environment is efficiency (can cover e.g. a week of historical data); this also requires mocking out time with simulation/replay time. The integration with data-platforms makes a big difference as it means data-scientists can help set up the right test scenarios.