---
type: email
from: Marc Klingen <marc@updates.langfuse.com>
subject: Tracing: Why it’s the foundation of reliable AI apps (1/3)
received: 2026-03-06 07:48:25
date_header: Wed, 1 Oct 2025 13:06:11 +0000
priority: normal
status: awaiting_approval
uid: 31703
---

## Email Content

**From:** Marc Klingen <marc@updates.langfuse.com>
**Subject:** Tracing: Why it’s the foundation of reliable AI apps (1/3)
**Date:** Wed, 1 Oct 2025 13:06:11 +0000

### Body (preview)

Hi Ubaidurrehman Usman,

 

This is the 1st of 3 onboarding mails I personally curate – you can unsubscribe below.

 

Let’s take a deeper look at tracing.

 

🔍 What is tracing?

Tracing captures everything happening during an LLM interaction: inputs, outputs, tool usage, retries, latencies and costs. It’s

all tied to a unique trace ID and visualized step-by-step.

 

What tracing can do for you

 * Faster debugging



 * Cost tracking for each model call



 * Performance tuning by spotting latency bottlenecks



 * Saving hours in customer support



 * Setting foundation for evaluations



 

Observability Demo Deep Dive (~11min) - Youtube link

[https://www.youtube.com/watch?v=pTneXS_m1rk&list=PL4v4zZF1rGG6Bmt3dgtQc31Byzy97t0xr&index=2]



https://www.youtube.com/watch?v=pTneXS_m1rk&list=PL4v4zZF1rGG6Bmt3dgtQc31Byzy97t0xr&index=2



 

 

Where to start?

 * Checkout the tracing data model [https://langfuse.com/docs/observability/data-model] to understand all objects & concepts

   (focus on traces and observations)



 * Use the quickstart [https://langfuse.com/docs/observability/get-started] to start in less than 5mins



 

Advanced concepts

 * Sessions [https://langfuse.com/docs/observability/features/sessions] – grouping traces into sessions for multi-turn workflows



 * Users [https://langfuse.com/docs/observability/features/users] – filtering traces by users



 * Tags [https://langfuse.com/docs/observability/features/tags] & Metadata

   [https://langfuse.com/docs/observability/features/metadata] – add custom information to traces



 * Multi-Modality and Attachments [https://langfuse.com/docs/observability/features/multi-modality]– images and files in traces



 * Model Usage & Cost Tracking [https://langfuse.com/docs/observability/features/token-and-cost-tracking]



 

Need help? Just hit reply, I read every message.

 

--

Marc Klingen

Co-founder & CEO, Langfuse

[https://langfuse.com/?utm_source=transactional&utm_medium=email&utm_campaign=we

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