@jasmineparkdev

jasminepark

@jasmineparkdev

Seattle, USAJoined May 2026

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Jjasmineparkjas-blogs.hashnode.dev

Langfuse alternatives: 6 LLM observability tools, sorted by the thing that bites you in month eight

1d ago · 6 min read · TL;DR I went looking for Langfuse alternatives after living with a proprietary tracer for eight months and then paying to migrate off it. I compared six options: Helicone Arize Phoenix LangSmith B

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We put a cost SLO on our LLM features. It is the number that finally made eng care about token spend.

3d ago · 3 min read · TL;DR: Our LLM bill was a single number going up, and "spend rose 18%" is not something an engineer can act on. We gave each feature a cost SLO, a target cost per successful outcome with a monthly err

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We cut our LLM trace bill 30% with two sampling rules

Jun 11 · 2 min read · Our observability bill for LLM traces was climbing in a straight line with request volume, and most of what we were paying to store was boring: successful calls that did exactly what they were suppose

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Per-project LLM cost attribution with OTel spans: the wiring

Jun 4 · 8 min read · TL;DR. If your LLM bill is one line item on a cloud invoice, you cannot answer "which team spent that." We fixed this by tagging every gateway span with team.id, project.id, and feature.id, plus the O

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jasminepark

About

Available for

jasminepark's blogs

Recently published

Langfuse alternatives: 6 LLM observability tools, sorted by the thing that bites you in month eight

We put a cost SLO on our LLM features. It is the number that finally made eng care about token spend.

We cut our LLM trace bill 30% with two sampling rules

Per-project LLM cost attribution with OTel spans: the wiring

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jasminepark

About

Available for

jasminepark's blogs

Recently published

Langfuse alternatives: 6 LLM observability tools, sorted by the thing that bites you in month eight

We put a cost SLO on our LLM features. It is the number that finally made eng care about token spend.

We cut our LLM trace bill 30% with two sampling rules

Per-project LLM cost attribution with OTel spans: the wiring