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feat: implement and compare LLM tracing options to Grafana. #269 - #313

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feat: implement and compare LLM tracing options to Grafana. #269#313
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@Azamat0315277

@Azamat0315277 Azamat0315277 commented Apr 20, 2026 •
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Applicable issue

PR #313 was opened to implement MLflow autologging. The branch evolved significantly — MLflow was replaced with OpenInference LangChainInstrumentor

Description of changes

What was changed

Replaces MLflow autologging with OpenInference LangChainInstrumentor for LLM tracing to Grafana, and includes several improvements merged from development.
LLM Tracing (core change)

  • pyproject.toml - added openinference-instrumentation-langchain;
  • statgpt/app/application/application.py - added LangChainInstrumentor().instrument() inside the FastAPI lifespan
  • .ort.yml - added license curations for new OpenInference transitive dependencies.

Why OpenInference over MLflow

  • MLflow's homegrown ContextVar tracking crashes under asyncio.gather . OpenInference uses context.attach()/detach() which asyncio copies correctly across task boundaries.

Configuration

❗ Set OTEL_EXPORTER_OTLP_TRACES_ENDPOINT environment variable for the Grafana OTLP endpoint.
❗ Set OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT to cap span attribute size (gRPC 4 MB limit).

Checklist

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

Status
Draft

Azamat Kuzdibayev
feat: add MLflow LangChain autologging with OTLP tracing.
558cae8 
 Add MLflow as a dependency and configure LangChain autologging for LLM tracing. Set up an OpenTelemetry TracerProvider with a BatchSpanProcessor
  backed by OTLPSpanExporter to forward traces to Grafana.
@Azamat0315277
Azamat0315277 requested a review from navalnica April 20, 2026 11:46
@Azamat0315277 Azamat0315277 self-assigned this Apr 20, 2026
@Azamat0315277 Azamat0315277 linked an issue Apr 20, 2026 that may be closed by this pull request
[ops] setup LLM tracing to grafana (using mlflow autologger) #269
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@Azamat0315277

Azamat0315277 commented Apr 20, 2026 •
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Azamat0315277 commented Apr 21, 2026 •
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Azamat Kuzdibayev
refactor: Move mlflow.langchain.autolog() out of module-level import …
7f119b6 
…in app.py and

  into the FastAPI lifespan, delete the
  manual TracerProvider, which was overriding the provider already registered by aidial-sdk via TelemetryConfig.
@Azamat0315277

Azamat0315277 commented Apr 21, 2026 •
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Azamat Kuzdibayev
fix: for testing purposes, temporarily enabling MLFLOW_TRACING_ENABLE…
a141a2f 
…D=true in the code; will be reverted after testing.
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Azamat0315277 commented Apr 21, 2026 •
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Azamat0315277 commented Apr 23, 2026 •
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Azamat Kuzdibayev added 2 commits April 28, 2026 11:44
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@Azamat0315277 Azamat0315277 changed the title feat: add MLflow LangChain LLM tracing to Grafana. feat: implement and compare LLM tracing options to Grafana. Apr 29, 2026
@Azamat0315277 Azamat0315277 changed the title feat: implement and compare LLM tracing options to Grafana. feat: implement and compare LLM tracing options to Grafana. #269 Apr 29, 2026
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MykhailoRyzhman commented May 13, 2026 •
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Stage Status
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matrix.application Cancelled 🚫

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@navalnica navalnica Awaiting requested review from navalnica navalnica is a code owner
@MykhailoRyzhman MykhailoRyzhman Awaiting requested review from MykhailoRyzhman MykhailoRyzhman will be requested when the pull request is marked ready for review MykhailoRyzhman is a code owner
@Fedir-Yatsenko Fedir-Yatsenko Awaiting requested review from Fedir-Yatsenko Fedir-Yatsenko will be requested when the pull request is marked ready for review Fedir-Yatsenko is a code owner

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[ops] setup LLM tracing to grafana (using mlflow autologger)

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