Observability: Logs, Metrics, Traces

1. What the Monolith Gave You for Free

In a monolith, debugging was close to easy. One stack trace told the whole story of a failure, the list of function calls that led to the error. One profiler found the slow function, the tool that measures where a program spends its time. One log file held the sequence of events in order.

Now split that system into twelve services. The story is scattered across twelve log streams and twelve dashboards. The request path exists only in the network, and no single machine can see all of it. **Observability is the discipline of getting the story back