Deploying an application is only the beginning.
When something goes wrong in production, developers need answers quickly.
Which service failed?
Why did the request become slow?
Did CPU or memory usage increase?
Did a database query fail?
Observability helps answer these questions using three major signals:
Logs help us understand what happened.
Metrics show how the system is behaving.
Traces help us understand how requests move through distributed services.
A strong observability setup can significantly reduce debugging time and make production systems easier to operate.