Add feature gate for refactor of OTLP->Datadog span translation (#37171)

#### Description

Add a feature gate
exporter.datadogexporter.EnableReceiveResourceSpansV2. Enabling this
gate uses a refactored implementation of OTLP->Datadog Span translation
which improves performance by 10%, and deprecates the following
functionality:
- No longer checks for resource-related values (container, env,
hostname) in span attributes. This previous behavior did not follow the
OTel spec.

After a migration period of 6 versions, we plan to change this to
opt-out, then deprecate the old functionality after another 6 versions.

#### Link to tracking issue

#37077

#### Testing
Add unit tests for new functionality (verify that relevant span
attributes aren't used). Ran collector with new feature flag enabled.

.chloggen/add-feature-flag-for-updated-datadog-span-receiver.yaml

@@ -0,0 +1,14 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: datadogexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Add a feature gate datadog.EnableReceiveResourceSpansV2. Enabling this gate uses a refactored implementation of OTLP->Datadog Span translation in datadogexporter and datadogconnector which improves performance by 10%, and deprecates the following functionality:
+        - No longer checks for resource-related values (container, env, hostname) in span attributes. This previous behavior did not follow the OTel spec."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [37171]

.github/CODEOWNERS

@@ -26,7 +26,7 @@ confmap/provider/s3provider/                      @open-telemetry/collector-cont
 confmap/provider/secretsmanagerprovider/          @open-telemetry/collector-contrib-approvers @driverpt @atoulme
 
 connector/countconnector/                         @open-telemetry/collector-contrib-approvers @djaglowski @jpkrohling
-connector/datadogconnector/                       @open-telemetry/collector-contrib-approvers @mx-psi @dineshg13 @ankitpatel96 @jade-guiton-dd
+connector/datadogconnector/                       @open-telemetry/collector-contrib-approvers @mx-psi @dineshg13 @ankitpatel96 @jade-guiton-dd @IbraheemA
 connector/exceptionsconnector/                    @open-telemetry/collector-contrib-approvers @marctc
 connector/failoverconnector/                      @open-telemetry/collector-contrib-approvers @akats7 @fatsheep9146
 connector/grafanacloudconnector/                  @open-telemetry/collector-contrib-approvers @rlankfo @jcreixell
@@ -54,7 +54,7 @@ exporter/carbonexporter/                          @open-telemetry/collector-cont
 exporter/cassandraexporter/                       @open-telemetry/collector-contrib-approvers @atoulme @emreyalvac
 exporter/clickhouseexporter/                      @open-telemetry/collector-contrib-approvers @hanjm @dmitryax @Frapschen @SpencerTorres
 exporter/coralogixexporter/                       @open-telemetry/collector-contrib-approvers @povilasv
-exporter/datadogexporter/                         @open-telemetry/collector-contrib-approvers @mx-psi @dineshg13 @liustanley @songy23 @mackjmr @ankitpatel96 @jade-guiton-dd
+exporter/datadogexporter/                         @open-telemetry/collector-contrib-approvers @mx-psi @dineshg13 @liustanley @songy23 @mackjmr @ankitpatel96 @jade-guiton-dd @IbraheemA
 exporter/datasetexporter/                         @open-telemetry/collector-contrib-approvers @atoulme @martin-majlis-s1 @zdaratom-s1 @tomaz-s1
 exporter/dorisexporter/                           @open-telemetry/collector-contrib-approvers @atoulme @joker-star-l
 exporter/elasticsearchexporter/                   @open-telemetry/collector-contrib-approvers @JaredTan95 @carsonip @lahsivjar
@@ -146,7 +146,7 @@ internal/tools/                                   @open-telemetry/collector-cont
 
 pkg/batchperresourceattr/                         @open-telemetry/collector-contrib-approvers @atoulme @dmitryax
 pkg/batchpersignal/                               @open-telemetry/collector-contrib-approvers @jpkrohling
-pkg/datadog/                                      @open-telemetry/collector-contrib-approvers @mx-psi @dineshg13 @liustanley @songy23 @mackjmr @ankitpatel96 @jade-guiton-dd
+pkg/datadog/                                      @open-telemetry/collector-contrib-approvers @mx-psi @dineshg13 @liustanley @songy23 @mackjmr @ankitpatel96 @jade-guiton-dd @IbraheemA
 pkg/experimentalmetricmetadata/                   @open-telemetry/collector-contrib-approvers @dmitryax
 pkg/golden/                                       @open-telemetry/collector-contrib-approvers @djaglowski @atoulme
 pkg/kafka/topic/                                  @open-telemetry/collector-contrib-approvers @pavolloffay @MovieStoreGuy

connector/datadogconnector/README.md

@@ -5,7 +5,7 @@
 | ------------- |-----------|
 | Distributions | [contrib] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aconnector%2Fdatadog%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aconnector%2Fdatadog) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aconnector%2Fdatadog%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aconnector%2Fdatadog) |
-| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@mx-psi](https://www.github.com/mx-psi), [@dineshg13](https://www.github.com/dineshg13), [@ankitpatel96](https://www.github.com/ankitpatel96), [@jade-guiton-dd](https://www.github.com/jade-guiton-dd) |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@mx-psi](https://www.github.com/mx-psi), [@dineshg13](https://www.github.com/dineshg13), [@ankitpatel96](https://www.github.com/ankitpatel96), [@jade-guiton-dd](https://www.github.com/jade-guiton-dd), [@IbraheemA](https://www.github.com/IbraheemA) |
 | Emeritus      | [@gbbr](https://www.github.com/gbbr) |
 
 [beta]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#beta

connector/datadogconnector/connector.go

@@ -24,6 +24,8 @@ import (
 	semconv "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.opentelemetry.io/otel/metric/noop"
 	"go.uber.org/zap"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/datadog"
 )
 
 // traceToMetricConnector is the schema for connector
@@ -117,6 +119,9 @@ func getTraceAgentCfg(logger *zap.Logger, cfg TracesConfig, attributesTranslator
 		logger.Info("traces::compute_top_level_by_span_kind needs to be enabled in both the Datadog connector and Datadog exporter configs if both components are being used")
 		acfg.Features["enable_otlp_compute_top_level_by_span_kind"] = struct{}{}
 	}
+	if datadog.ReceiveResourceSpansV2FeatureGate.IsEnabled() {
+		acfg.Features["enable_receive_resource_spans_v2"] = struct{}{}
+	}
 	if v := cfg.BucketInterval; v > 0 {
 		acfg.BucketInterval = v
 	}

connector/datadogconnector/connector_test.go

@@ -192,6 +192,67 @@ func TestContainerTags(t *testing.T) {
 	assert.ElementsMatch(t, []string{"region:my-region", "zone:my-zone", "az:my-az"}, tags)
 }
 
+func TestReceiveResourceSpansV2(t *testing.T) {
+	t.Run("ReceiveResourceSpansV1", func(t *testing.T) {
+		testReceiveResourceSpansV2(t, false)
+	})
+	t.Run("ReceiveResourceSpansV2", func(t *testing.T) {
+		testReceiveResourceSpansV2(t, true)
+	})
+}
+
+func testReceiveResourceSpansV2(t *testing.T, enableReceiveResourceSpansV2 bool) {
+	if enableReceiveResourceSpansV2 {
+		if err := featuregate.GlobalRegistry().Set("datadog.EnableReceiveResourceSpansV2", true); err != nil {
+			t.Fatal(err)
+		}
+	}
+	connector, metricsSink := creteConnector(t)
+	err := connector.Start(context.Background(), componenttest.NewNopHost())
+	if err != nil {
+		t.Errorf("Error starting connector: %v", err)
+		return
+	}
+	defer func() {
+		_ = connector.Shutdown(context.Background())
+	}()
+
+	trace := generateTrace()
+	sattr := trace.ResourceSpans().At(0).ScopeSpans().At(0).Spans().At(0).Attributes()
+
+	sattr.PutStr("deployment.environment.name", "do-not-use")
+
+	err = connector.ConsumeTraces(context.Background(), trace)
+	assert.NoError(t, err)
+
+	for {
+		if len(metricsSink.AllMetrics()) > 0 {
+			break
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+
+	// check if the container tags are added to the metrics
+	metrics := metricsSink.AllMetrics()
+	assert.Len(t, metrics, 1)
+
+	ch := make(chan []byte, 100)
+	tr := newTranslatorWithStatsChannel(t, zap.NewNop(), ch)
+	_, err = tr.MapMetrics(context.Background(), metrics[0], nil)
+	require.NoError(t, err)
+	msg := <-ch
+	sp := &pb.StatsPayload{}
+
+	err = proto.Unmarshal(msg, sp)
+	require.NoError(t, err)
+
+	if enableReceiveResourceSpansV2 {
+		assert.Equal(t, "none", sp.Stats[0].Env)
+	} else {
+		assert.Equal(t, "do-not-use", sp.Stats[0].Env)
+	}
+}
+
 func newTranslatorWithStatsChannel(t *testing.T, logger *zap.Logger, ch chan []byte) *otlpmetrics.Translator {
 	options := []otlpmetrics.TranslatorOption{
 		otlpmetrics.WithHistogramMode(otlpmetrics.HistogramModeDistributions),

connector/datadogconnector/metadata.yaml

@@ -6,9 +6,9 @@ status:
     beta: [traces_to_metrics, traces_to_traces]
   distributions: [contrib]
   codeowners:
-    active: [mx-psi, dineshg13, ankitpatel96, jade-guiton-dd]
+    active: [mx-psi, dineshg13, ankitpatel96, jade-guiton-dd, IbraheemA]
     emeritus: [gbbr]
 
 tests:
   goleak:
-    skip: true
+    skip: true

exporter/datadogexporter/README.md

@@ -6,7 +6,7 @@
 | Stability     | [beta]: traces, metrics, logs   |
 | Distributions | [contrib] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aexporter%2Fdatadog%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aexporter%2Fdatadog) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aexporter%2Fdatadog%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aexporter%2Fdatadog) |
-| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@mx-psi](https://www.github.com/mx-psi), [@dineshg13](https://www.github.com/dineshg13), [@liustanley](https://www.github.com/liustanley), [@songy23](https://www.github.com/songy23), [@mackjmr](https://www.github.com/mackjmr), [@ankitpatel96](https://www.github.com/ankitpatel96), [@jade-guiton-dd](https://www.github.com/jade-guiton-dd) |
+| [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@mx-psi](https://www.github.com/mx-psi), [@dineshg13](https://www.github.com/dineshg13), [@liustanley](https://www.github.com/liustanley), [@songy23](https://www.github.com/songy23), [@mackjmr](https://www.github.com/mackjmr), [@ankitpatel96](https://www.github.com/ankitpatel96), [@jade-guiton-dd](https://www.github.com/jade-guiton-dd), [@IbraheemA](https://www.github.com/IbraheemA) |
 | Emeritus      | [@gbbr](https://www.github.com/gbbr) |
 
 [beta]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#beta

exporter/datadogexporter/metadata.yaml

@@ -6,7 +6,7 @@ status:
     beta: [traces, metrics, logs]
   distributions: [contrib]
   codeowners:
-    active: [mx-psi, dineshg13, liustanley, songy23, mackjmr, ankitpatel96, jade-guiton-dd]
+    active: [mx-psi, dineshg13, liustanley, songy23, mackjmr, ankitpatel96, jade-guiton-dd, IbraheemA]
     emeritus: [gbbr]
 
 tests:
@@ -22,4 +22,4 @@ tests:
   expect_consumer_error: true
   goleak:
     setup: "setupTestMain(m)"
-    skip: true
+    skip: true

exporter/datadogexporter/traces_exporter.go

@@ -32,6 +32,7 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/hostmetadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/metrics"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/scrub"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/datadog"
 )
 
 var traceCustomHTTPFeatureGate = featuregate.GlobalRegistry().MustRegister(
@@ -238,6 +239,9 @@ func newTraceAgentConfig(ctx context.Context, params exporter.Settings, cfg *Con
 	if cfg.Traces.ComputeTopLevelBySpanKind {
 		acfg.Features["enable_otlp_compute_top_level_by_span_kind"] = struct{}{}
 	}
+	if datadog.ReceiveResourceSpansV2FeatureGate.IsEnabled() {
+		acfg.Features["enable_receive_resource_spans_v2"] = struct{}{}
+	}
 	tracelog.SetLogger(&zaplogger{params.Logger}) // TODO: This shouldn't be a singleton
 	return acfg, nil
 }