14 open-source LLM observability tools to know in 2026, from Langfuse to Laminar
TheTuringPost · x · 2026-10-16
Turing Post's 2026 guide to open-source LLM monitoring and agent observability covers tracing, evals, replay, and drift detection. Top picks: Langfuse and Opik for integrated observability; MLflow for teams also running conventional ML; LangWatch for agent simulations; AgentOps for session replay; OpenLIT for AI-plus-GPU telemetry. OpenLLMetry and OpenTelemetry Collector offer portable instrumentation; Evidently handles quality/drift evals; Weave does repeatable evaluations; Helicone is gateway-first; Grafana OSS correlates traces/metrics/logs; Laminar combines OTel-native tracing, evals, datasets, and SQL access in one self-hostable platform. Key point: production AI systems retrieve, call APIs, spawn sub-agents, and retry—debugging requires reconstructing the full execution trajectory.
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