Distributed Tracing
Technique for tracking and correlating requests across services to make performance issues and root causes in distributed systems visible.
Classification
- ComplexityMedium
- Impact areaTechnical
- Decision typeArchitectural
- Organizational maturityIntermediate
Technical context
Principles & goals
Use cases & scenarios
Compromises
- Missing or inconsistent instrumentation leads to misleading results
- Privacy risks from unintentionally captured sensitive data in traces
- High storage costs with uncontrolled trace retention
- Use standardized trace IDs and context propagation
- Define and document sampling strategies
- Mask or filter sensitive data before capturing traces
I/O & resources
- Instrumented application libraries
- Trace export/collector infrastructure
- Storage and analysis backend
- Trace history and visualizations
- Root causes and critical paths
- Metrics for latency and error trends
Description
Distributed tracing is a technique to record and correlate requests across services to analyze performance and diagnose failures in distributed systems. It captures spans and trace context across process and network boundaries, enabling root-cause analysis, latency breakdowns, and dependency mapping. Widely used for observability and operational debugging.
✔Benefits
- Faster fault localization and root-cause analysis
- Finer performance insights across service boundaries
- Improved cross-team communication through shared traces
✖Limitations
- Only captures instrumented paths; blind spots remain
- Additional runtime and storage overhead
- Correlation challenges for asynchronous or batch jobs
Trade-offs
Metrics
- Average request latency (trace)
Mean duration of a distributed request measured via traces.
- Share of error traces
Percentage of traces containing errors or exceptions.
- Spans per trace
Average number of spans in a trace as a granularity indicator.
Examples & implementations
Jaeger for distributed trace analysis
Use of Jaeger to collect, visualize, and analyze traces in a microservice environment.
OpenTelemetry instrumentation for HTTP services
Use libraries to automatically instrument HTTP requests and propagate trace context.
End-to-end trace for reproducing failures
Store complete request traces to follow a failure path across multiple services.
Implementation steps
Instrument application libraries with OpenTelemetry and propagate trace context.
Set up OpenTelemetry Collector and configure exporters.
Tune trace sampling, retention, and storage layer to SLAs and costs.
⚠️ Technical debt & bottlenecks
Technical debt
- Outdated instrumentation in legacy components
- Missing trace context propagation in batch jobs
- Monolithic exporters with poor scalability
Known bottlenecks
Misuse examples
- Collect traces containing full user data and store them violating privacy
- Aggressive sampling that hides rare errors
- Instrument only parts of the system and draw wrong conclusions
Typical traps
- Confusing trace latency with system latency without context
- Ignoring asynchronous workflows when correlating
- Insufficient sampling design leads to missing insights
Required skills
Architectural drivers
Constraints
- • Performance overhead must not violate SLAs
- • Security and privacy requirements for trace data
- • Compatibility with existing monitoring systems