How do you build observability for an LLM application, and how does it differ from traditional monitoring?
You cannot improve an LLM app you cannot see into, and LLM observability is not service monitoring. The signal is tracing multi-step chains, capturing inputs/outputs/tokens/cost, and online quality signals, not just latency and errors.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
You cannot improve an LLM app you cannot see into, and LLM observability is not service monitoring. The signal is tracing multi-step chains, capturing inputs/outputs/tokens/cost, and online quality signals, not just latency and errors.
Lead with where the obvious approach breaks, because that is the judgment they are screening for — most candidates jump straight to the happy path and lose the room.
Then walk the failure back through the pipeline in order, naming the one metric the customer's exec sponsor actually cares about before you propose the fix.