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#observability (7)

Cheat sheets (7)

pino — Very Low Overhead Node Logger

Package-level reference for pino on npm — child loggers, redaction, transports, serializers, and migration notes.
npm package pino logging observability json

winston — Multi-Transport Logger for Node

Package-level reference for winston on npm — transports, formats, levels, daily rotation, and production patterns.
npm package winston logging observability

langsmith — LLM Observability SDK

Package-level reference for the langsmith SDK on PyPI — install, versioning, env-var setup, and observability alternatives.
pip package llm ai observability evaluation tracing

trulens-eval — LLM App Evaluation and Tracing

Package-level reference for trulens-eval on PyPI — install variants, the trulens umbrella rename, framework extras, and alternative evaluators.
pip package ai rag evaluation observability

journalctl — systemd Journal Query

Query and follow systemd's structured journal. Covers unit filters, time ranges, priority levels, boot logs, namespaces, invocations, output formats, persistence, configuration, and disk-vacuum.
journalctl cli sysadmin logs systemd observability web-researched

LangSmith — LLM Observability & Evaluation

Trace, debug, evaluate, and monitor LLM applications with LangSmith. Covers tracing setup, datasets, evaluators, prompt hub, comparing runs, and CI integration.
python langsmith llm observability tracing evaluation langchain ai

TruLens — LLM App Evaluation

Evaluate and monitor LLM applications with TruLens. Covers the RAG triad, feedback functions, TruChain, TruLlama, custom evaluators, the dashboard, and CI integration.
python trulens rag evaluation llm ai observability feedback