Quick answer: what distributed tracing is
Distributed tracing follows a request across services by recording spans and propagating trace context between components. A trace shows the path a transaction took, how long each step consumed and where errors or retries occurred.
Why distributed tracing matters
In a distributed system, a slow API may depend on several internal services, queues, databases and third-party calls. Tracing reduces guesswork by keeping the work connected across those boundaries.
What to measure
- end-to-end trace duration
- span duration by service and operation
- error status and exception events on spans
- service and resource attributes that explain where the span ran
- sampling coverage and whether important failure traces are retained
How to implement it without creating noise
- Standardize service names and resource attributes before scaling instrumentation.
- Propagate trace context across HTTP, messaging and asynchronous boundaries.
- Instrument key server, client, database and queue operations without recording sensitive payloads.
- Choose a sampling strategy that preserves useful failures and representative normal traffic within cost limits.
Common mistakes
- Creating traces with inconsistent service names or missing context propagation.
- Sampling so aggressively that rare failures disappear.
- Recording secrets or high-cardinality attributes without governance.
How it fits with related monitoring practices
Tracing explains request paths. Metrics are better for aggregate trends and alerting, while logs preserve detailed events. The strongest investigations move between all three using shared context.
Frequently asked questions
What should I start with?
Start with one user-facing outcome and the smallest set of signals that can tell you whether it is healthy and why it changed. Add telemetry only when it answers a real operational question.
Should I alert on every metric?
No. Alert on conditions that require timely action. Keep exploratory and diagnostic measurements available for investigation without turning each one into a page.
How do I know the setup is working?
Test it with a known failure or controlled regression. Confirm that data arrives with the expected context, the alert reaches the owner and the linked evidence is sufficient to choose the next action.
Sources and further reading for distributed tracing
Use primary sources for definitions and current product capabilities. The references below were reviewed for this content update.