test(otel): OTel HTTP semantics coverage against the cross-tracer RFC

[link04]

Summary

Adds tests for HTTP OpenTelemetry semantic conventions enabled by DD_TRACE_OTEL_SEMANTICS_ENABLED and exported over OTLP.

Coverage includes HTTP server and client attributes, span naming and status (and custom error-status configuration), and trace metrics.

Scenarios

Scenario	Test class	Tests	Coverage
OTEL_SEMANTICS_OTLP	Test_OtelSemantics_Spans_Http_Server	19	Server attributes, naming, status semantics, URL handling, addressing, span kind, and endpoint retention
OTEL_SEMANTICS_OTLP	Test_OtelSemantics_Spans_Http_Client	11	Client attributes, naming, status semantics, peer-service suppression, span kind, and URL redaction
OTEL_SEMANTICS_OTLP_CUSTOM_ERROR_STATUSES	Test_OtelSemantics_OTLP_Spans_Http_ErrorStatusConfiguration	4	Configured client and server error-status ranges replace the defaults
OTEL_SEMANTICS_OTLP_TRACE_METRICS	Test_OtelSemantics_OTLP_TraceMetrics	4	OTLP trace metrics agree with their corresponding HTTP spans
OTEL_SEMANTICS_OTLP_SAMPLING_RULES	Test_OtelSemantics_SamplingRules	2	Semantic resource names are available when sampling decisions occur

Test_OtelSemantics_Spans_Http_Server

Test	Description
test_otel_attributes_present	Verifies canonical method, URL, and typed response-status attributes are present.
test_datadog_attributes_absent	Verifies Datadog HTTP attribute aliases are omitted.
test_span_name_with_route	Verifies a resolved low-cardinality route contributes to the span name.
test_span_name_route_invariance	Verifies path-parameter values do not change the route or span name.
test_span_name_without_route	Verifies an unresolved route never places the concrete URI path in the span name.
test_span_name_unknown_method	Verifies unknown methods use _OTHER attributes and HTTP in the span name.
test_status_500_no_exception_is_status_code_error	Verifies an HTTP 500 response marks the server span as an error.
test_status_400_is_not_error	Verifies an HTTP 400 response does not mark a server span as an error.
test_status_3xx_is_not_error	Verifies redirects do not mark server spans as errors.
test_url_query_present_with_query_string	Verifies url.query is emitted when a query string is present.
test_url_query_absent_without_query_string	Verifies url.query is omitted when no query string exists.
test_url_query_obfuscation	Verifies sensitive query values are obfuscated.
test_user_agent	Verifies the canonical original user-agent attribute.
test_client_address	Verifies the canonical client address and removal of its Datadog alias.
test_network_peer_address	Verifies the network peer address is available.
test_server_address	Verifies the canonical server address and removal of its Datadog alias.
test_server_port	Verifies server.port is emitted as an OTLP integer.
test_http_endpoint_retained	Verifies the Datadog endpoint fallback remains available for route-less requests.
test_span_kind_is_server	Verifies the OTLP span kind is SERVER.

Test_OtelSemantics_Spans_Http_Client

Test	Description
test_otel_attributes_present	Verifies canonical method, URL, server, and typed response-status attributes are present.
test_datadog_attributes_absent	Verifies Datadog client HTTP aliases are omitted.
test_peer_service_suppressed	Verifies peer-service defaults remain disabled in semantic-conventions mode.
test_span_name_is_method	Verifies the client span name uses the normalized HTTP method without the URI path.
test_span_name_unknown_method	Verifies unknown methods use _OTHER attributes and HTTP in the span name.
test_span_kind_is_client	Verifies the OTLP span kind is CLIENT.
test_status_400_is_error	Verifies an HTTP 400 response marks a client span as an error.
test_status_500_is_error	Verifies an HTTP 500 response marks a client span as an error.
test_status_3xx_not_error	Verifies redirects do not mark client spans as errors.
test_url_full_credential_redaction	Verifies credentials embedded in url.full are removed or redacted.
test_url_full_query_obfuscation	Verifies sensitive query values in url.full are obfuscated.

Test_OtelSemantics_OTLP_Spans_Http_ErrorStatusConfiguration

Test	Description
test_server_error_statuses_config_overrides	Verifies the configured server range can mark HTTP 200 as an error.
test_server_error_statuses_config_excludes_500	Verifies replacing the server range can exclude HTTP 500 from errors.
test_client_error_statuses_config_overrides	Verifies the configured client range can mark HTTP 200 as an error.
test_client_error_statuses_config_excludes_500	Verifies replacing the client range can exclude HTTP 500 from errors.

Test_OtelSemantics_OTLP_TraceMetrics

Test	Description
test_trace_metric_agrees_with_client_error	Verifies an errored client metric matches the span method, status, name, kind, and error decision.
test_trace_metric_agrees_with_client_success	Verifies a successful client metric matches the span and leaves status.code unset.
test_trace_metric_agrees_with_server_error	Verifies an errored server metric matches the span method, status, name, kind, and error decision.
test_trace_metric_agrees_with_server_success	Verifies a successful server metric matches the span and leaves status.code unset.

Test_OtelSemantics_SamplingRules

Test	Description
test_otel_span_name_is_available_to_sampling_rules	Verifies the normalized unknown-method resource matches its keep rule and every exported span is sampled.
test_server_span_name_is_available_before_client_sampling	Verifies outbound propagation can sample the server trace and keep both server and client spans.

[datadog-prod-us1-5]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 402c665 | Docs | View more details | Give us feedback!}

[github-actions]

CODEOWNERS have been resolved as:

tests/test_otel_http_semantics.py                                       @DataDog/system-tests-core
.github/workflows/run-end-to-end.yml                                    @DataDog/system-tests-core
docs/understand/weblogs/end-to-end_weblog.md                            @DataDog/system-tests-core
manifests/c.yml                                                         @DataDog/system-tests-reviewers
manifests/cpp.yml                                                       @DataDog/system-tests-reviewers
manifests/cpp_httpd.yml                                                 @DataDog/system-tests-reviewers
manifests/cpp_kong.yml                                                  @DataDog/system-tests-reviewers
manifests/cpp_nginx.yml                                                 @DataDog/system-tests-reviewers
manifests/dotnet.yml                                                    @DataDog/system-tests-reviewers
manifests/golang.yml                                                    @DataDog/system-tests-reviewers
manifests/java.yml                                                      @DataDog/system-tests-reviewers
manifests/nodejs.yml                                                    @DataDog/system-tests-reviewers
manifests/php.yml                                                       @DataDog/system-tests-reviewers
manifests/python.yml                                                    @DataDog/system-tests-reviewers
manifests/ruby.yml                                                      @DataDog/system-tests-reviewers
manifests/rust.yml                                                      @DataDog/system-tests-reviewers
tests/otel/test_tracing_otlp.py                                         @DataDog/system-tests-core
utils/_context/_scenarios/__init__.py                                   @DataDog/system-tests-core
utils/build/docker/dotnet/weblog/Dependencies/HttpClientWrapper.cs      @DataDog/system-tests-reviewers
utils/build/docker/dotnet/weblog/Endpoints/MakeDistantCallEndpoint.cs   @DataDog/system-tests-reviewers
utils/build/docker/dotnet/weblog/Endpoints/ManualKeepDropEndpoint.cs    @DataDog/system-tests-reviewers
utils/build/docker/dotnet/weblog/Endpoints/OtelDropInEndpoint.cs        @DataDog/system-tests-reviewers
utils/build/docker/golang/app/net-http/main.go                          @DataDog/system-tests-reviewers
utils/build/docker/nodejs/express/app.js                                @DataDog/system-tests-reviewers
utils/build/docker/nodejs/express4-typescript/app.ts                    @DataDog/system-tests-reviewers
utils/build/docker/nodejs/fastify/app.js                                @DataDog/system-tests-reviewers
utils/build/docker/proxy.Dockerfile                                     @DataDog/system-tests-reviewers
utils/build/docker/python/django/app/urls.py                            @DataDog/system-tests-reviewers
utils/build/docker/python/fastapi/main.py                               @DataDog/system-tests-reviewers
utils/build/docker/python/flask/app.py                                  @DataDog/system-tests-reviewers
utils/build/docker/python/tornado/main.py                               @DataDog/system-tests-reviewers
utils/interfaces/_open_telemetry.py                                     @DataDog/system-tests-core
utils/proxy/traces/otlp_v1.py                                           @DataDog/system-tests-core

[marcotc]

@codex review

[chatgpt-codex-connector]

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[marcotc]

@codex review

[xlamorlette-datadog]

OK for the C++ part.

[marcotc]

I rewrote commit history (!) to fix previous unsigned commits.