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 request path that crosses multiple services. Verify trace-context propagation and stable service/span naming before increasing trace coverage.
Should I alert on every metric?
Do not alert on every span characteristic. Page on service-impact symptoms; use traces to explain where time or errors accumulated across dependencies.
How do I know the setup is working?
Force a safe downstream delay or error and verify the trace remains connected across process boundaries, contains the expected attributes and leads a responder to the affected dependency.
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.