Distributed Tracing
An observability technique used to track the complete call chain of a request across a distributed system. It works by generating spans at individual service nodes and associating them into a unified trace, enabling developers to understand system behavior, identify performance bottlenecks, and diagnose root causes of failures.
Core Facts
In traditional microservice architectures, distributed tracing relies on standards such as OpenTelemetry to link cross-service call chains via TraceID.
Observability tools such as OpenTelemetry and LangSmith are applying distributed tracing concepts to monitor the execution chains of AI agents.
Timeline (last 90 days)
Metrics cannot replace tracing: if you need to debug the full path of each model and carrier call, you should use an OpenTelemetry-compatible tracing backend; source-map symbolication, crash dumps and session replay are also specialized tools.
A span is the smallest unit of work in distributed tracing, representing an operation with a start time, end time, and metadata, and multiple spans are combined into a trace through parent-child relationships or links.
Compared with distributed tracing traces, behavioral trajectories focus more on "what decisions were made" rather than "how long it took," and can capture changes where latency and error rates are normal but semantics go off track.
Traditional distributed tracing only needs to record an existing call chain, whereas agent tracing must construct that chain at runtime and bind it to identity, authorization, and policy evaluation.
In agent workflows, a single user request may trigger dozens of model calls, making distributed tracing capability particularly critical for correlating cross-step calls.
When an agent calls an external tool, the tracing system typically only records the call start time, end time, and top-level result returned, without automatically capturing internal state changes within the external service.
Spans are the basic units of distributed tracing, representing the start and end of an operation, with multiple spans combined into a complete request chain.
In traditional microservice architectures, distributed tracing relies on standards such as OpenTelemetry to link cross-service call chains via TraceID.
Task lineage is essentially the application of distributed tracing concepts to the Agent domain, analogous to OpenTelemetry Traces in the microservices domain.
Observability tools such as OpenTelemetry and LangSmith are applying distributed tracing concepts to monitor the execution chains of AI agents.
All Facts (11)
In traditional microservice architectures, distributed tracing relies on standards such as OpenTelemetry to link cross-service call chains via TraceID.
65%VerifiedObservability tools such as OpenTelemetry and LangSmith are applying distributed tracing concepts to monitor the execution chains of AI agents.
65%Unverified事件日志中的事件天然对应分布式追踪中的Span概念，每个事件可携带TraceID和SpanID来还原完整的因果链路
85%UnverifiedMetrics cannot replace tracing: if you need to debug the full path of each model and carrier call, you should use an OpenTelemetry-compatible tracing backend; source-map symbolication, crash dumps and session replay are also specialized tools.
50%UnverifiedA span is the smallest unit of work in distributed tracing, representing an operation with a start time, end time, and metadata, and multiple spans are combined into a trace through parent-child relationships or links.
50%UnverifiedCompared with distributed tracing traces, behavioral trajectories focus more on "what decisions were made" rather than "how long it took," and can capture changes where latency and error rates are normal but semantics go off track.
50%UnverifiedTraditional distributed tracing only needs to record an existing call chain, whereas agent tracing must construct that chain at runtime and bind it to identity, authorization, and policy evaluation.
50%UnverifiedIn agent workflows, a single user request may trigger dozens of model calls, making distributed tracing capability particularly critical for correlating cross-step calls.
50%UnverifiedWhen an agent calls an external tool, the tracing system typically only records the call start time, end time, and top-level result returned, without automatically capturing internal state changes within the external service.
50%UnverifiedSpans are the basic units of distributed tracing, representing the start and end of an operation, with multiple spans combined into a complete request chain.
50%UnverifiedTask lineage is essentially the application of distributed tracing concepts to the Agent domain, analogous to OpenTelemetry Traces in the microservices domain.
50%