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Track Metrics in Traces

Track trace-level metrics like tool call counts, costs, and evaluation scores. 
const trace = logger.trace({
    id: "trace-id",
    name: "customer-query-processing",
});

// Track metrics
trace.addMetric('tool_calls_count', 3);
trace.addMetric('cost_usd', 0.05);
trace.addMetric('tokens_total', 1420);
trace.addMetric('user_feedback_score', 4.7);

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Track Metrics in Generations

Track generation quality metrics, token accounting, and streaming characteristics for LLM calls. 
// Create generation object
const generation = trace.generation({
    id: "generation-id",
    name: "customer-support--gather-information",
    // Additional fields
});

// Track metrics
generation.addMetric('tokens_in', 312);
generation.addMetric('tokens_out', 87);
generation.addMetric('output_tokens', 87);
generation.addMetric('ttft_ms', 180.5);
generation.addMetric('tps', 15.8);
generation.addMetric('avg_logprob', -0.32);
Learn how to track complete LLM flows in the LLM logging guide.

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Track Metrics in Retrievals

Track RAG evaluation metrics like precision, recall, MRR, and NDCG for retrieval operations. 
const retrieval = trace.retrieval({
    id: "retrieval-id",
    name: "knowledge-base-search",
});

// Track metrics
retrieval.addMetric('precision', 0.82);
retrieval.addMetric('recall', 0.76);
retrieval.addMetric('mrr', 0.61);
retrieval.addMetric('results_count', 10);
Explore more on retrieval tracking in the Retrieval logging guide.

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Track Metrics in Sessions

Track session-level aggregates like trace counts and message counts. 
const session = logger.session({
    id: "session-id",
    name: "user-conversation",
});

// Track metrics
session.addMetric('traces_count', 4);
session.addMetric('user_messages_count', 2);
session.addMetric('assistant_messages_count', 2);
Metrics