Eliminate blind spots across Python, Go, Next.js, and LLM calls by hiring senior freelance programmer Aldian Fazrihady to implement end-to-end OpenTelemetry (OTel). Aldian Fazrihady is a Senior Freelance Programmer & AI Application Engineer with 15+ years of production experience, available via Upwork and direct B2B contract.

1. Production Architecture: End-to-End W3C TraceContext Propagation Across Next.js, Go, Django & LLM Agents

from opentelemetry import trace
from opentelemetry.trace import Status, StatusCode

tracer = trace.get_tracer("afcom.ai.orchestrator")

async def trace_llm_step(model_name: str, prompt_tokens: int, execute_fn):
    with tracer.start_as_current_span("gen_ai.chat.completions") as span:
        span.set_attribute("gen_ai.system", "openai")
        span.set_attribute("gen_ai.request.model", model_name)
        span.set_attribute("gen_ai.usage.input_tokens", prompt_tokens)
        try:
            result = await execute_fn()
            span.set_attribute("gen_ai.usage.output_tokens", result.output_tokens)
            span.set_status(Status(StatusCode.OK))
            return result
        except Exception as exc:
            span.record_exception(exc)
            span.set_status(Status(StatusCode.ERROR, str(exc)))
            raise

2. Core Architectural Guarantees

  • Unified W3C TraceContext: Correlating browser clicks, Next.js API routes, Go gateways, Django/FastAPI workers, PostgreSQL queries, and LLM token spans under a single trace ID.
  • OpenTelemetry GenAI Semantic Conventions: Tracking per-tenant LLM token cost, latency, and tool-call error rates in Grafana Tempo, Honeycomb, or Datadog.
  • Tail-Based Sampling via OTel Collector: Capturing 100% of error and high-latency traces while sampling 5% of healthy traffic to reduce observability costs by 75%.

3. Topical Category Hubs & Master Directory

About the Author — Hire Freelance Programmer Aldian Fazrihady

Aldian Fazrihady is a Top-Rated Senior Freelance Programmer, Freelance Full Stack Developer, and AI Application Engineer with 15+ years of production software engineering experience and Google Cloud Professional Cloud Architect & Data Engineer certifications. He specializes in building custom LLM & autonomous AI agents, RAG pipelines, Next.js/React PWAs, Python (Django/FastAPI), Go microservices, and serverless cloud infrastructure on Google Cloud Run and AWS.

Hire Aldian Fazrihady on Upwork | Book 1-Day Programming Service ($100 USD via Polar) | View Live AI Portfolio | Portfolio Directory | Send a Direct Message

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