[Discover how prevention starts before the attack at InterSECt 2026. Watch Now](https://www.paloaltonetworks.com/intersect?ts=markdown) [Prisma AIRS AI Gateway is now generally available](https://www.paloaltonetworks.com/ai-security/ai-gateway?ts=markdown) [](https://www.paloaltonetworks.com/?ts=markdown) Search All * [Tech Docs](https://docs.paloaltonetworks.com/search) Close search modal 1. [Cyberpedia](https://www.paloaltonetworks.com/cyberpedia?ts=markdown) 2. [Observability](https://www.paloaltonetworks.com/cyberpedia/observability?ts=markdown) 3. [Observability Fundamentals](https://www.paloaltonetworks.com/cyberpedia/what-is-observability?ts=markdown) 4. [Distributed Tracing](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing?ts=markdown) Table of Contents * [What Is Observability? Core Signals, Benefits, and Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-observability?ts=markdown) * [Why Observability Matters](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#matters?ts=markdown) * [How Observability Works](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#works?ts=markdown) * [The Core Signals of Observability](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#core?ts=markdown) * [Benefits of Observability](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#benefits?ts=markdown) * [Common Observability Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#usecase?ts=markdown) * [Observability vs. Security](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#security?ts=markdown) * [Common Observability Challenges](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#challenges?ts=markdown) * [What Makes a System Observable?](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#observable?ts=markdown) * [Observability in Cloud Native Environments](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#environments?ts=markdown) * [Observability FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-observability#page-anchor?ts=markdown) * [What Is Cloud Native Observability?](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability?ts=markdown) * [Why Cloud Native Environments Require Observability](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#why?ts=markdown) * [How Cloud Native Observability Works](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#native?ts=markdown) * [Cloud Native Observability and Kubernetes](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#kubernetes?ts=markdown) * [Benefits of Cloud Native Observability](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#benefits?ts=markdown) * [Cloud Native Observability Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#best?ts=markdown) * [How Palo Alto Networks Approaches Cloud Native Observability](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#approaches?ts=markdown) * [Cloud Native Observability FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability#faqs?ts=markdown) * What Is Distributed Tracing? * [Why Distributed Tracing Matters](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#why?ts=markdown) * [How Distributed Tracing Works](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#how?ts=markdown) * [Core Components of a Trace](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#core?ts=markdown) * [Distributed Tracing with OpenTelemetry](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#distributed?ts=markdown) * [Sampling Strategies](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#sampling?ts=markdown) * [Distributed Tracing Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#tracing?ts=markdown) * [Distributed Tracing Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#best?ts=markdown) * [Distributed Tracing FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#faqs?ts=markdown) * [What Are SRE Fundamentals: SLA vs SLO vs SLI?](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli?ts=markdown) * [SRE Fundamentals Explained](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli#sre-fundamentals?ts=markdown) * [SLA vs. SLO vs. SLI: A Comparative Framework](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli#sla-vs-slo?ts=markdown) * [Breaking Down the Components: SLI, SLO, and SLA](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli#components?ts=markdown) * [The Strategic Role of Error Budgets in SRE](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli#strategic-role?ts=markdown) * [Best Practices for Implementing SRE Metrics](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli#best-practices?ts=markdown) * [SRE Fundamentals FAQs](https://www.paloaltonetworks.com/cyberpedia/sre-fundamentals-sla-vs-slo-vs-sli#faqs?ts=markdown) * [Observability vs. Monitoring: Key Differences](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences?ts=markdown) * [Observability vs. Monitoring Explained](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#explained?ts=markdown) * [Observability vs. Monitoring: Key Differences](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#differences?ts=markdown) * [Why Monitoring Alone Is No Longer Enough](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#why?ts=markdown) * [The Role of Telemetry in Observability](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#role?ts=markdown) * [Observability in Cloud Native and Kubernetes Environments](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#environments?ts=markdown) * [Observability and Security](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#security?ts=markdown) * [Observability for AI Systems](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#systems?ts=markdown) * [When to Use Monitoring](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#when?ts=markdown) * [When to Use Observability](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#use?ts=markdown) * [How Observability and Monitoring Work Together](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#how?ts=markdown) * [Benefits of Observability](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#benefits?ts=markdown) * [Challenges of Observability](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#challenges?ts=markdown) * [How to Build an Observability Strategy](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#strategy?ts=markdown) * [Observability vs. Monitoring FAQ](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences#faqs?ts=markdown) * [What Is OpenTelemetry (OTel)?](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry?ts=markdown) * [OpenTelemetry Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry#openTelemetry-explained?ts=markdown) * [The Three Pillars of OTel Signals](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry#the-three-pillars-of-OTel-signals?ts=markdown) * [Strategic Benefits and Advantages](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry#strategic-benefits-and-advantages?ts=markdown) * [Implementation Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry#implementation-best-practices?ts=markdown) * [OpenTelemetry FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry#OpenTelemetry-faq?ts=markdown) * [What Is High Cardinality in Observability?](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality?ts=markdown) * [High Cardinality Explained](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#explained?ts=markdown) * [Why High Cardinality Matters in Observability](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#observability?ts=markdown) * [Cardinality vs. Dimensionality](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#cardinality?ts=markdown) * [How High Cardinality Happens](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#happens?ts=markdown) * [The Impact of High Cardinality on Observability Systems](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#impact?ts=markdown) * [Example: How Cardinality Multiplies](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#multiplies?ts=markdown) * [How to Reduce High Cardinality](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#reduce?ts=markdown) * [Metrics vs. Logs vs. Traces for High-Cardinality Data](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#metrics?ts=markdown) * [Best Practices for Managing High Cardinality](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#practices?ts=markdown) * [Why High Cardinality Is a Governance Problem](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#governance?ts=markdown) * [FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality#faq?ts=markdown) # What Is Distributed Tracing? 4 min. read Table of Contents * * [Why Distributed Tracing Matters](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#why?ts=markdown) * [How Distributed Tracing Works](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#how?ts=markdown) * [Core Components of a Trace](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#core?ts=markdown) * [Distributed Tracing with OpenTelemetry](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#distributed?ts=markdown) * [Sampling Strategies](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#sampling?ts=markdown) * [Distributed Tracing Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#tracing?ts=markdown) * [Distributed Tracing Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#best?ts=markdown) * [Distributed Tracing FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#faqs?ts=markdown) 1. Why Distributed Tracing Matters * * [Why Distributed Tracing Matters](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#why?ts=markdown) * [How Distributed Tracing Works](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#how?ts=markdown) * [Core Components of a Trace](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#core?ts=markdown) * [Distributed Tracing with OpenTelemetry](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#distributed?ts=markdown) * [Sampling Strategies](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#sampling?ts=markdown) * [Distributed Tracing Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#tracing?ts=markdown) * [Distributed Tracing Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#best?ts=markdown) * [Distributed Tracing FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing#faqs?ts=markdown) Distributed tracing is a method for following a request as it moves through an application's services, APIs, databases, queues and infrastructure. Each operation is recorded as a span and linked into a trace, giving teams an end-to-end view of the request path. Distributed tracing helps identify where latency, errors and failures originate in complex microservices and cloud native systems. Key Points * **End-to-end visibility**: A trace represents the complete journey of a request through a distributed system. \* **Span context**: Spans record individual operations, timing, status and contextual attributes. \* **Connected requests**: Trace and span IDs connect activity across service boundaries. \* **Faster diagnosis**: Distributed tracing helps isolate bottlenecks, dependency failures and error propagation. \* **OpenTelemetry standards**: OpenTelemetry provides widely adopted standards for generating and exporting traces. ## Why Distributed Tracing Matters In a monolithic application, an engineer may be able to locate a failure in one process or log file. In a distributed application, a single transaction can move through many independently deployed services. An error seen by the customer may have started several dependencies upstream. This pattern is common in [cloud native systems](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability?ts=markdown). Distributed tracing preserves the relationships between those operations. Instead of searching separate logs by timestamp, teams can inspect the actual request path, see how much time each service consumed and identify the point where an error or delay entered the transaction. It is a core [observability practice](https://www.paloaltonetworks.com/cyberpedia/what-is-observability?ts=markdown) for diagnosing behavior that simple service-level checks cannot explain. ### Anatomy of a Distributed Trace ![Anatomy of a Distributed Trace](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/distributed-tracing/anatomy-of-distributed-trace.webp "Anatomy of a Distributed Trace") ***Figure 1**: A distributed trace links parent and child spans across services so teams can isolate latency and errors.* ## How Distributed Tracing Works When a request enters an instrumented application, the tracing system assigns a trace ID. Each service creates a span for the work it performs and propagates trace context to the next service. The resulting parent-child relationships reconstruct the transaction from beginning to end. Spans commonly contain start and end times, service and operation names, status, attributes and links to relevant events. A span may represent an HTTP request, database query, message-queue operation, model inference or internal function. The trace backend stores and visualizes these spans as a timeline or dependency graph. ## Core Components of a Trace The trace ID identifies the complete transaction. A span ID identifies one operation. Parent span IDs establish sequence and dependency. Attributes add searchable context such as endpoint, region, service version or error type. Events mark meaningful points during the span, while status indicates whether the operation succeeded. Baggage can propagate selected contextual values across services, but it should be governed carefully. Sensitive data, credentials and unbounded identifiers can create privacy, security and cost problems when copied through every span. ### Distributed Tracing Components | Component | Role | Key Data | Diagnostic Value | | **Trace** | Represents one end-to-end transaction | Trace ID and total duration | Shows the complete request journey | | **Span** | Represents one operation | Start time, duration, status and attributes | Isolates slow or failed operations | | **Context propagation** | Connects work across service boundaries | Trace ID, span ID and selected baggage | Preserves parent-child relationships | | **Collector** | Receives and processes trace data | Enrichment, filtering and routing rules | Standardizes delivery to analysis backends | | **Sampling** | Controls which traces are retained | Error, latency, service and probability policies | Balances investigative fidelity and cost | |-------------------------|-----------------------------------------|--------------------------------------------------|--------------------------------------------| ## Distributed Tracing with OpenTelemetry [OpenTelemetry](https://www.paloaltonetworks.com/cyberpedia/what-is-open-telemetry?ts=markdown) supplies vendor-neutral APIs, SDKs, automatic instrumentation and collectors for traces, metrics and logs. The OpenTelemetry Protocol can transport trace data to compatible backends, allowing organizations to standardize instrumentation while retaining flexibility in analysis platforms. Teams may use automatic instrumentation for common frameworks and add manual spans around business-critical operations. The collector can enrich, sample, filter and route traces before export. ## Sampling Strategies Collecting every trace can be expensive in high-volume systems. Head-based sampling makes a decision when the trace begins and is simple to operate, but it may discard rare failures before their outcome is known. Tail-based sampling evaluates completed traces and can retain errors or high-latency transactions, although it requires more processing and temporary storage. A sound sampling policy preserves high-value evidence: failed requests, unusual latency, critical services, security-relevant activity and representative healthy traffic. The goal is controlled fidelity, not indiscriminate data reduction. ## Distributed Tracing Use Cases Common use cases include root-cause analysis, microservice dependency mapping, release validation, performance optimization, database troubleshooting, service-level objective analysis and incident investigation. Traces can also help teams understand the behavior of AI applications by following calls across gateways, models, tools, retrieval systems and downstream services. Security teams can use trace context to investigate abnormal service paths or determine which applications and data stores were involved in suspicious activity. Tracing complements security telemetry; it does not replace runtime protection, access controls or audit logging. ## Distributed Tracing Best Practices Use consistent service and operation names. Instrument customer-critical paths first. Propagate context across asynchronous boundaries. Correlate traces with logs and metrics. Scrub secrets and sensitive payloads. Control[high-cardinality attributes](https://www.paloaltonetworks.com/cyberpedia/what-is-high-cardinality?ts=markdown) and monitor the health of collectors and exporters. Teams should also define retention and sampling around investigative value. Traces are most useful when engineers can move from an alert or metric to the relevant transaction without changing tools or manually rebuilding context. This request-level evidence complements[traditional monitoring](https://www.paloaltonetworks.com/cyberpedia/observability-vs-monitoring-key-differences?ts=markdown) when predefined checks cannot explain the cause. ## Distributed Tracing FAQs ### What is the difference between a trace and a span? A trace represents an end-to-end transaction. A span represents one operation within that transaction, such as an API call or database query. ### What is trace context propagation? It is the process of passing trace identifiers and selected context between services so their spans can be linked into one trace. ### Is distributed tracing the same as application performance monitoring? No. Distributed tracing is a diagnostic technique. APM is a broader practice and product category that may include traces, metrics, code-level diagnostics, errors and user-experience monitoring. ### Can distributed tracing expose sensitive information? Yes. Span attributes, baggage and captured payloads can contain credentials or personal data. Organizations should use collection policies, redaction and access controls. ### Does distributed tracing work with asynchronous systems? Yes, but instrumentation must propagate or link context through queues, event streams and background jobs so related operations remain connected. ![Share page on facebook](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/facebook-circular-icon.svg) ![Share page on linkedin](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/linkedin-circular-icon.svg) [![Share page by an email](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/email-circular-icon.svg)](mailto:?subject=What%20Is%20Distributed%20Tracing%3F&body=Learn%20how%20distributed%20tracing%20follows%20requests%20across%20microservices%2C%20using%20traces%20and%20spans%20to%20find%20latency%2C%20errors%20and%20dependencies%20in%20cloud%20native%20applications.%20at%20https%3A//www.paloaltonetworks.com/cyberpedia/what-is-distributed-tracing) Back to Top [Previous](https://www.paloaltonetworks.com/cyberpedia/what-is-cloud-native-observability?ts=markdown) What Is Cloud Native Observability? 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