Observability: Logs, Metrics, Traces

1. What the Monolith Gave You Without Any Effort

In a monolith, debugging was close to easy. One stack trace showed the whole path 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