Observability

Select the signals a production RAG system must log to make failures debuggable

What belongs in the trace of every LLM call?

How do you watch answer quality in production when nothing is labeled?

Why does OpenTelemetry's GenAI semantic convention spec matter for choosing an observability stack in 2026?

Defend the choice between LangSmith and Langfuse for an LLM heavy startup that may add Mastra and DSPy alongside LangChain in year two

Which statement best captures why LangSmith and Langfuse are NOT interchangeable choices for LLM observability?

Identify the lifecycle events that a LangChain `BaseCallbackHandler` natively exposes (select all that apply)

Why is BaseCallbackHandler the seam every LangChain observability vendor hooks into?

P99 TTFT spikes every Tuesday at 9am, order the triage steps

Design a multi-tenant remote MCP server that exposes each customer's Postgres database. Walk through transport, auth, isolation, and observability.

Flashcard: what is an agent 'trajectory' and why does it matter for evaluation?

What does one agent trace capture step by step?

What does observability mean for production LLM agents, and how is it different from app monitoring?

Design an observability and debugging system for a production multi-agent application with 5+ collaborating agents.

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What traces and metrics do you need to debug a P99 TTFT regression in production LLM serving?

Which metrics are essential to debug a P99 TTFT regression in production LLM serving?

How should a production MCP host handle a tool call that exceeds the latency budget?

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What metrics would you instrument to evaluate the health of a production MCP integration?

What does a rising approval rejection ratio signal in a production MCP integration?

How can an agent confidently produce a wrong answer without raising any runtime exception?

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What events must be logged in every agent execution trace for debugging to be tractable?

Which events must every agent execution trace capture to enable debugging of production failures?