feat(tracer): wire OTLP span metrics into tracer flush path by rachelyangdog · Pull Request #4900 · DataDog/dd-trace-go

rachelyangdog · 2026-06-16T15:47:33Z

OTLP Span Metrics — Part 4 of 4: Tracer Integration

Wires the OTLP span metrics exporter into the tracer.

Stack order (merge in sequence):

otlp-span-metrics-config — configuration (PR feat(config): add OTLP span metrics config #4895)
otlp-span-metrics-conversion — ClientStatsPayload → OTLP protobuf conversion (PR feat(tracer): stats to OTLP histogram conversion for OTLP span metrics #4897)
otlp-span-metrics-transport — OTLP HTTP exporter (PR feat(tracer): add OTLP metrics HTTP exporter for span metrics #4899)
This PR — tracer integration and system-test fixes

What this PR does

Tracer integration (tracer.go, stats.go):

When OTLPSpanMetricsEnabled=true, instantiates a newOTLPMetricsConcentrator instead of the standard concentrator; this routes flushed stats to the OTLP endpoint rather than the agent's /v0.6/stats path
Flushes the concentrator's input channel before shutdown to avoid dropping spans

Peer tag handling (stats.go):

Adds otlpPeerTags to the concentrator; when set, overrides agent-advertised peer tags with a fixed OTel-convention set (http.route, grpc.method.name)
Injects span.kind=client only when the span carries a peer-tag value, so non-top-level unmeasured spans are not incorrectly made eligible for stats computation

Datadog-Client-Computed-Stats header (option.go, log.go):

Sets the header statically in transport headers when OTLPSpanMetricsEnabled=true, ensuring it is present from the very first request (including the startup probe), before the agent /info poll completes

Testing

End-to-end parametric system tests: tests/parametric/test_otlp_trace_metrics.py — 44 passed, 2 xfailed
Unit tests in otlp_metrics_wireup_test.go

Motivation

Reviewer's Checklist

Changed code has unit tests for its functionality at or near 100% coverage.
System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
There is a benchmark for any new code, or changes to existing code.
If this interacts with the agent in a new way, a system test has been added.
New code is free of linting errors. You can check this by running make lint locally.
New code doesn't break existing tests. You can check this by running make test locally.
Add an appropriate team label so this PR gets put in the right place for the release notes.
All generated files are up to date. You can check this by running make generate locally.
Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild. Make sure all nested modules are up to date by running make fix-modules locally.

Unsure? Have a question? Request a review!

datadog-datadog-prod-us1 · 2026-06-16T15:48:43Z

Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 88.19%
• Overall Coverage: 62.89% (+0.03%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: 8c04d86 | Docs | Datadog PR Page | Give us feedback!}

codecov · 2026-06-16T15:53:04Z

Codecov Report

❌ Patch coverage is 90.65421% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.63%. Comparing base (94f54e9) to head (5603e81).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ddtrace/tracer/stats_to_otlp_metrics.go	91.36%	7 Missing and 5 partials ⚠️
ddtrace/tracer/otlp_metrics_exporter.go	86.36%	3 Missing and 3 partials ⚠️
internal/config/config.go	86.66%	5 Missing and 1 partial ⚠️
internal/config/config_helpers.go	87.50%	2 Missing and 2 partials ⚠️
ddtrace/tracer/stats.go	94.11%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ddtrace/tracer/otlp_writer.go	`96.55% <100.00%> (-1.04%)`	⬇️
ddtrace/tracer/tracer.go	`88.55% <100.00%> (-3.59%)`	⬇️
ddtrace/tracer/transport.go	`84.89% <100.00%> (-7.92%)`	⬇️
ddtrace/tracer/stats.go	`96.59% <94.11%> (-1.47%)`	⬇️
internal/config/config_helpers.go	`63.80% <87.50%> (+0.44%)`	⬆️
ddtrace/tracer/otlp_metrics_exporter.go	`86.36% <86.36%> (ø)`
internal/config/config.go	`61.29% <86.66%> (-2.89%)`	⬇️
ddtrace/tracer/stats_to_otlp_metrics.go	`91.36% <91.36%> (ø)`

... and 290 files with indirect coverage changes

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pr-commenter · 2026-06-16T16:14:30Z

Benchmarks

Benchmark execution time: 2026-07-23 20:02:05

Comparing candidate commit 8c04d86 in PR branch rachel.yang/otlp-span-metrics-wireup with baseline commit 37558e3 in branch rachel.yang/otlp-span-metrics-transport.

Found 0 performance improvements and 6 performance regressions! Performance is the same for 320 metrics, 0 unstable metrics, 1 known flaky benchmarks.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:BenchmarkOTLPTraceWriterAdd/10spans

🟥 execution_time [+1.294µs; +1.693µs] or [+5.400%; +7.063%]

scenario:BenchmarkOTLPTraceWriterAdd/1span

🟥 execution_time [+153.569ns; +189.631ns] or [+6.286%; +7.762%]

scenario:BenchmarkOTLPTraceWriterAdd/50spans

🟥 execution_time [+5.929µs; +7.762µs] or [+4.939%; +6.467%]

scenario:BenchmarkOTLPTraceWriterAdd/5spans

🟥 execution_time [+628.548ns; +882.252ns] or [+5.222%; +7.330%]

scenario:BenchmarkOTLPTraceWriterConcurrent/concurrency_1

🟥 execution_time [+522.276ns; +599.324ns] or [+14.855%; +17.046%]

scenario:BenchmarkPayloadVersions/simple_1spans/v1.0

🟥 execution_time [+31.172ns; +46.828ns] or [+4.101%; +6.160%]

Known flaky benchmarks

These benchmarks are marked as flaky and will not trigger a failure. Modify FLAKY_BENCHMARKS_REGEX to control which benchmarks are marked as flaky.

scenario:BenchmarkOTLPTraceWriterFlush

🟩 allocations [-2; -2] or [-2.041%; -2.041%]
🟩 execution_time [-7.714µs; -6.341µs] or [-12.048%; -9.904%]

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github-actions · 2026-07-02T14:51:12Z

Config Audit

PACKAGE: contrib/cloud.google.com/go/pubsubtrace
  STATUS      CONFIG                                            CALL_SITES
  UNMIGRATED  DD_GOOGLE_CLOUD_PUBSUB_PROPAGATION_AS_SPAN_LINKS  1

PACKAGE: contrib/confluentinc/confluent-kafka-go/kafkatrace
  STATUS      CONFIG                            CALL_SITES
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PACKAGE: ddtrace/opentelemetry/log
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  UNMIGRATED  OTEL_EXPORTER_OTLP_LOGS_ENDPOINT  4
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  UNMIGRATED  OTEL_EXPORTER_OTLP_TIMEOUT        1
  UNMIGRATED  OTEL_RESOURCE_ATTRIBUTES          1

PACKAGE: ddtrace/opentelemetry/metric
  STATUS      CONFIG                                             CALL_SITES
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  STILL_READ  OTEL_EXPORTER_OTLP_METRICS_HEADERS                 1
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  STILL_READ  OTEL_EXPORTER_OTLP_PROTOCOL                        2
  STILL_READ  OTEL_METRICS_EXPORTER                              1
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PACKAGE: instrumentation
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  STATUS      CONFIG                                             CALL_SITES
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PACKAGE: internal
  STATUS      CONFIG                         CALL_SITES
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PACKAGE: internal/appsec
  STATUS      CONFIG           CALL_SITES
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  STATUS      CONFIG                     CALL_SITES
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PACKAGE: internal/bazel
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PACKAGE: internal/civisibility/envconfig
  STATUS      CONFIG                   CALL_SITES
  STILL_READ  DD_CIVISIBILITY_ENABLED  1

PACKAGE: internal/civisibility/integrations
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PACKAGE: internal/civisibility/integrations/gotesting
  STATUS      CONFIG                                                           CALL_SITES
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PACKAGE: internal/civisibility/integrations/logs
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PACKAGE: internal/civisibility/utils
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PACKAGE: internal/civisibility/utils/net
  STATUS      CONFIG                             CALL_SITES
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PACKAGE: internal/civisibility/utils/telemetry
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PACKAGE: internal/globalconfig
  STATUS      CONFIG                           CALL_SITES
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PACKAGE: internal/hostname
  STATUS      CONFIG       CALL_SITES
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PACKAGE: internal/namingschema
  STATUS      CONFIG                                             CALL_SITES
  STILL_READ  DD_SERVICE                                         1
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PACKAGE: internal/processtags
  STATUS      CONFIG                                          CALL_SITES
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PACKAGE: internal/remoteconfig
  STATUS      CONFIG                                  CALL_SITES
  STILL_READ  DD_ENV                                  1
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PACKAGE: internal/stacktrace
  STATUS      CONFIG                           CALL_SITES
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PACKAGE: internal/telemetry
  STATUS      CONFIG                                             CALL_SITES
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PACKAGE: openfeature
  STATUS      CONFIG                                                     CALL_SITES
  STILL_READ  DD_ENV                                                     2
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  STILL_READ  DD_SERVICE                                                 2
  STILL_READ  DD_VERSION                                                 2
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PACKAGE: profiler
  STATUS      CONFIG                                    CALL_SITES
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  UNMIGRATED  DD_PROFILING_URL                          1

darccio

LGTM

… path (PR 4) - Add otlpExporter field to concentrator; flushAndSend branches to OTLP or native /v0.6/stats - Add newOTLPMetricsConcentrator constructor; select it in newUnstartedTracer when OTLPSpanMetricsEnabled - FR15: set Datadog-Client-Computed-Stats: yes header when OTLPSpanMetricsEnabled - FR15: append _dd.stats_computed=true resource attr on OTLP trace payloads - Fix sketchToHistogram to decode protobuf-serialized DDSketches (agent format) - Add SetOTLPSpanMetricsEnabled setter in internal/config for test wiring Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…ics flush interval Two bugs prevented OTLP span metrics from being exported in system tests: 1. _DD_TRACE_METRICS_OTEL_FLUSH_INTERVAL was read via env.Get() (allowlist), which returned "" for this internal-only override, defaulting to 10s. Switch to os.Getenv for this test-only internal variable. 2. tracer.Flush() called flushAndSend() directly while spans may still be pending in the concentrator's In channel (not yet processed by runIngester). Drain the In channel before flushing when includeCurrent=true so spans submitted just before Flush() are included in the export. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- Add otlpPeerTags to concentrator; inject span.kind="client" only when the span carries a peer-tag value (http.route, grpc.method.name) so non-top-level unmeasured spans are not made eligible via eligibleSpanKind - Set Datadog-Client-Computed-Stats header statically in transport headers when OTLPSpanMetricsEnabled so it is present from the first request - Pass transport headers to checkEndpoint startup probe so the header is included on the initial 0-trace-chunk connection check Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- Replace for-loop map copy with maps.Copy in stats.go (mapsloop) - Replace bare int32/int64 atomic vars with atomic.Int32/Int64 types in otlp_transport_test.go and otlp_writer_test.go (atomictypes) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…e as first-class field _dd.stats_computed is a string-valued Datadog convention; change from BoolValue(true) to StringValue("true") to match libdatadog and the system-test spec. http.route (ext.HTTPRoute) is now captured as the HTTPEndpoint first-class field with a fallback after ext.HTTPEndpoint, so OTel-instrumented spans get http.route emitted as a data-point attribute via buildDataPointAttributes. Remove "http.route" from otlpDefaultPeerTags since it had no effect on attribute emission (only grpc.method.name peer tags are converted to attributes). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…port field Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…feedback) Remove the goroutine + shared WaitGroup pattern from flush(). The shared WaitGroup caused a misuse panic when multiple goroutines called flush() concurrently (each calling Add then Wait on the same WaitGroup). Making flush synchronous also fixes FR15_3: tracer.Flush() now blocks until the OTLP trace payload reaches the collector, consistent with how the concentrator sends metrics synchronously. The worker goroutine already serialises flush calls in production; the climit concurrency cap was redundant and is removed along with the WaitGroup fields. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…es back to t The t→yes rename was an unrelated silent behavior change riding along with the OTLPSpanMetricsEnabled condition. The agent checks header presence, not value, so both are functionally equivalent, but keeping t avoids a gratuitous diff. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…emanticsEnabled) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…view) - Remove grpc.method.name from otlpDefaultPeerTags: peer tags increase stats bucket cardinality per gRPC method, contradicting the June 25 spec change that removed rpc.method to prevent cardinality inflation. Peer tags are explicitly out of scope per the RFC attribute table. - Fix BucketInterval hardcoded to defaultStatsBucketSize in newConcentrator; pass bucketSize so _DD_TRACE_STATS_INTERVAL controls the aggregation window. - Fix redundant s.meta.Map(false) call in peer-tag span.kind injection path. - Extract sendWithRetry helper to deduplicate identical retry loops in flushAndSend's OTLP and native /v0.6/stats branches. - Add comment explaining Datadog-Client-Computed-Stats value change from "t" to "yes" (spec-correct per FR15; both values accepted by the Agent). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…4 downgrade for OTLP span metrics - Emit tracer_dd_tags array resource attribute for non-reserved DD_TAGS/ OTEL_RESOURCE_ATTRIBUTES key:value pairs (fixes fr08_10, fr08_11) - Emit additional_metric_tags array data-point attribute from ClientGroupedStats.AdditionalMetricTags (fixes fr08_12) - Downgrade trace transport to v0.4 when OTLP span metrics are enabled so the Datadog-Client-Computed-Stats header is visible to the test agent (fixes fr02_3, fr15_1) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

… and v0.4 downgrade for OTLP span metrics" This reverts commit 2183b17.

…s and v0.4 downgrade for OTLP span metrics" This reverts commit 861a599.

…15_3) The test_fr15_3 system test decodes the OTLP trace payload body as UTF-8 JSON. The writer was sending protobuf, causing a UnicodeDecodeError. Switch proto.Marshal → protojson.Marshal and update the content type to application/json. Update unit tests to decode with protojson.Unmarshal. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…fixes fr15_3)" This reverts commit 44e38fe.

…P attrs Both were Go-specific extensions carrying over DD_TAGS/DD_TRACE_STATS_ADDITIONAL_TAGS semantics from the native /v0.6/stats path, but neither appears in the RFC's attribute tables. datadog.<key> per-process-tag resource attributes (which are RFC-required) are unaffected. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

…ng/otlp-span-metrics-wireup # Conflicts: # ddtrace/tracer/stats.go

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rachelyangdog and others added 16 commits July 23, 2026 12:48

fix(tracer): shorten comments in PR4 and fix wireup test to use trans…

4b03d7b

…port field Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

revert: restore Datadog-Client-Computed-Stats header value to yes

7daad09

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fix(tracer): remove dead OTLPSemanticsMode method (duplicate of OTelS…

2dc50c2

…emanticsEnabled) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Revert "fix(tracer): add tracer_dd_tags, additional_metric_tags attrs…

5e74428

… and v0.4 downgrade for OTLP span metrics" This reverts commit 2183b17.

Reapply "fix(tracer): add tracer_dd_tags, additional_metric_tags attr…

6b65e23

…s and v0.4 downgrade for OTLP span metrics" This reverts commit 861a599.

Revert "fix(tracer): switch OTLP trace writer to HTTP/JSON encoding (…

a597b80

…fixes fr15_3)" This reverts commit 44e38fe.

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Merge branch 'rachel.yang/otlp-span-metrics-transport' into rachel.ya…

8c04d86

…ng/otlp-span-metrics-wireup # Conflicts: # ddtrace/tracer/stats.go

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feat(tracer): wire OTLP span metrics into tracer flush path#4900

feat(tracer): wire OTLP span metrics into tracer flush path#4900
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OTLP Span Metrics — Part 4 of 4: Tracer Integration

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