Blog/Tag
7 articles tagged OpenTelemetry, newest first. Each one is sourced and written for people who ship.
AI agents
·8 min read
Pydantic AI 2.55: typed dependencies, validated output and OpenTelemetry tracing for Python agents. What 2.0 changed, Logfire costs, who should pick it.
LLMOps & evals
·7 min read
Opik: traces, LLM-as-a-judge metrics, prompt versions and an optimiser on one Apache 2.0 platform. Free to self-host, Pro cloud $19/month, US-hosted.
LLMOps & evals
·10 min read
Langfuse: LLM traces, prompt versions and experiments on one MIT-licensed platform. What self-hosting costs, how unit pricing adds up, and where it loses.
LLMOps & evals
·12 min read
How to trace LLM agents with OpenTelemetry: GenAI semantic conventions and their status, span tree, token metrics, sampling, PII, evals and tool options.
LLMOps & evals
·10 min read
Arize Phoenix: an ELv2-licensed tracing and eval server on your own database. Strengths, operating cost, and where Langfuse, Braintrust or LangSmith win.
LLMOps & evals
·10 min read
Helicone: an Apache-2.0 LLM gateway and observability platform. What its proxy architecture buys, what it costs you, and how self-hosting really looks.
LLMOps & evals
·10 min read
LangSmith review: per-trace billing, 14 and 180 day retention, OpenTelemetry ingestion, offline and online evals, and its pull toward an agent runtime.