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LangChain
LangChain
Versions: [0.3]20 metrics

LangChain is a framework for building applications powered by large language models. The ecosystem includes LangChain (orchestration), LangGraph (stateful agents), and LangSmith (observability). Metrics cover token usage, latency, chain/agent execution, retriever performance, and evaluation quality scores. Official LangChain docs: LangChain Documentation

OpentelemetryOpentelemetryOfficial Opentelemetry LangChain metrics docs:GitHubOpenLLMetry - OpenTelemetry for LLMs

Get context for LangChain metrics

LangChaingen_ai_client_operation_timeOpentelemetryHistogramUnits:sGenAI operation durationDocumentation
LangChaingen_ai_client_token_usageOpentelemetryHistogramUnits:{token}Measures number of input and output tokens usedDocumentation
LangChaingen_ai_server_request_timeOpentelemetryHistogramUnits:sGenerative AI server request durationDocumentation
LangChaingen_ai_server_time_per_output_tokenOpentelemetryHistogramUnits:sTime per output token generatedDocumentation
LangChaingen_ai_server_time_to_first_tokenOpentelemetryHistogramUnits:sTime to generate first tokenDocumentation
LangChainlangchain_agent_intermediate_stepsOpentelemetryHistogramUnits:{step}Number of intermediate steps (thoughts/actions) before agent finishesDocumentation
LangChainlangchain_chain_errorOpentelemetrySumUnits:{error}Number of chain execution errorsDocumentation
LangChainlangchain_chain_runOpentelemetrySumUnits:{run}Number of chain executionsDocumentation
LangChainlangchain_chain_timeOpentelemetryHistogramUnits:sDuration of a LangChain chain executionDocumentation
LangChainlangchain_embedding_timeOpentelemetryHistogramUnits:sDuration of an embedding operationDocumentation
LangChainlangchain_langgraph_checkpoint_sizeOpentelemetryGaugeUnits:BySize of a LangGraph checkpoint (serialized state)Documentation
LangChainlangchain_langgraph_node_invocationOpentelemetrySumUnits:{invocation}Number of times a LangGraph node was invokedDocumentation
LangChainlangchain_langgraph_node_timeOpentelemetryHistogramUnits:sDuration of a LangGraph node executionDocumentation
LangChainlangchain_langgraph_recursion_limit_hitOpentelemetrySumUnits:{event}Number of times the recursion limit was reachedDocumentation
LangChainlangchain_llm_costOpentelemetrySumUnits:USDEstimated USD cost of an LLM call based on token counts and model pricingDocumentation
LangChainlangchain_retriever_documentOpentelemetryHistogramUnits:{document}Number of documents returned by a retriever callDocumentation
LangChainlangchain_retriever_timeOpentelemetryHistogramUnits:sDuration of a retriever call (vector search / document fetch)Documentation
LangChainlangchain_tool_errorOpentelemetrySumUnits:{error}Number of tool execution errorsDocumentation
LangChainlangchain_tool_invocationOpentelemetrySumUnits:{invocation}Number of tool invocationsDocumentation
LangChainlangchain_tool_timeOpentelemetryHistogramUnits:sDuration of a tool invocation within an agentDocumentation