[Advent of Agents] Day 30: Observability: Debug with Hierarchical Tracing

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abraha...@google.com

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Mar 30, 2026, 1:14:36 PMMar 30

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Hi everyone,

Day 30 of Google's Advent of Agents — Season 2 is now live! 🌸

Stop debugging in the dark and start visualizing the non-linear reasoning of your AI agents to eliminate silent failures. Learn how to use OpenTelemetry and Arize Phoenix to step inside an agent's 'thought process' and isolate hallucinations or latency issues instantly.

Today's Highlights:

Implement Hierarchical Trace Observability to transform opaque agent reasoning into discrete, measurable spans.
Use OpenInference instrumentors to automatically capture granular data from Google GenAI and LLM providers.
Leverage Span Replay and Prompt Playground sandboxes to troubleshoot and fix specific failures using original execution variables.

👉 View Day 30 Drop Here

Missed a day? View the full archive here.

Happy building!
The Advent of Agents Team

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