Highly Observable We cannot rely on observing the behavior of a single service instance or the status of a single machine to see if the system is functioning correctly. Instead, we need a joined-up view of what is happening. Use semantic monitoring to see if your system is behaving correctly, by injecting synthetic transactions into your system to simulate real-user behavior. Aggregate your logs, and aggregate your stats, so that when you see a problem you can drill down to the source. And when it comes to reproducing nasty issues or just seeing how your system is interacting in production,
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