[connector/datadog] Clean up feature gate (open-telemetry#31416)

Move feature gate connector.datadogconnector.performance to stable stage
and remove use of the feature gate.
Also mark datadogconnector as no longer mutating trace data.

.chloggen/datadogconnector-feature-gate.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: breaking
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: datadogconnector
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Move feature gate `connector.datadogconnector.performance` to stable stage."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [31414]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: "`connector.datadogconnector.performance` will be removed in the next release"
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

.chloggen/datadogconnector-mutates-data.yaml

@@ -0,0 +1,27 @@
+# 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: datadogconnector
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: datadogconnector no longer mutates the input traces in trace-to-trace pipelines.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [31414]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

connector/datadogconnector/connector.go

@@ -125,15 +125,11 @@ func (c *traceToMetricConnector) run() {
 			}
 			var mx pmetric.Metrics
 			var err error
-			if datadog.ConnectorPerformanceFeatureGate.IsEnabled() {
-				c.logger.Debug("Received stats payload", zap.Any("stats", stats))
-				mx, err = c.translator.StatsToMetrics(stats)
-				if err != nil {
-					c.logger.Error("Failed to convert stats to metrics", zap.Error(err))
-					continue
-				}
-			} else {
-				mx = c.translator.StatsPayloadToMetrics(stats)
+			c.logger.Debug("Received stats payload", zap.Any("stats", stats))
+			mx, err = c.translator.StatsToMetrics(stats)
+			if err != nil {
+				c.logger.Error("Failed to convert stats to metrics", zap.Error(err))
+				continue
 			}
 			// APM stats as metrics
 			ctx := context.TODO()

connector/datadogconnector/traces_connector.go

@@ -12,10 +12,6 @@ import (
 	"go.uber.org/zap"
 )
 
-// keyStatsComputed specifies the resource attribute key which indicates if stats have been
-// computed for the resource spans.
-const keyStatsComputed = "_dd.stats_computed"
-
 type traceToTraceConnector struct {
 	logger         *zap.Logger
 	tracesConsumer consumer.Traces // the next component in the pipeline to ingest traces after connector
@@ -42,17 +38,10 @@ func (c *traceToTraceConnector) Shutdown(_ context.Context) error {
 // Capabilities implements the consumer interface.
 // tells use whether the component(connector) will mutate the data passed into it. if set to true the connector does modify the data
 func (c *traceToTraceConnector) Capabilities() consumer.Capabilities {
-	return consumer.Capabilities{MutatesData: true} // ConsumeTraces puts a new attribute _dd.stats_computed
+	return consumer.Capabilities{MutatesData: false}
 }
 
 // ConsumeTraces implements the consumer interface.
 func (c *traceToTraceConnector) ConsumeTraces(ctx context.Context, traces ptrace.Traces) error {
-	for i := 0; i < traces.ResourceSpans().Len(); i++ {
-		rs := traces.ResourceSpans().At(i)
-		// Stats will be computed for p. Mark the original resource spans to ensure that they don't
-		// get computed twice in case these spans pass through here again.
-		rs.Resource().Attributes().PutBool(keyStatsComputed, true)
-
-	}
 	return c.tracesConsumer.ConsumeTraces(ctx, traces)
 }

exporter/datadogexporter/factory.go

@@ -297,12 +297,9 @@ func (f *factory) createMetricsExporter(
 	set.Logger.Debug("Starting Datadog Trace-Agent StatsWriter")
 	go statsWriter.Run()
 
-	var statsIn chan []byte
-	if datadog.ConnectorPerformanceFeatureGate.IsEnabled() {
-		statsIn = make(chan []byte, 1000)
-		statsv := set.BuildInfo.Command + set.BuildInfo.Version
-		f.consumeStatsPayload(ctx, statsIn, statsToAgent, statsv, acfg.AgentVersion, set.Logger)
-	}
+	statsIn := make(chan []byte, 1000)
+	statsv := set.BuildInfo.Command + set.BuildInfo.Version
+	f.consumeStatsPayload(ctx, statsIn, statsToAgent, statsv, acfg.AgentVersion, set.Logger)
 	pcfg := newMetadataConfigfromConfig(cfg)
 	metadataReporter, err := f.Reporter(set, pcfg)
 	if err != nil {

exporter/datadogexporter/integrationtest/go.mod

@@ -6,7 +6,6 @@ require (
 	github.com/DataDog/datadog-agent/pkg/proto v0.52.0-devel
 	github.com/open-telemetry/opentelemetry-collector-contrib/connector/datadogconnector v0.95.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter v0.95.0
-	github.com/open-telemetry/opentelemetry-collector-contrib/internal/datadog v0.95.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/processor/tailsamplingprocessor v0.95.0
 	github.com/stretchr/testify v1.8.4
 	github.com/tinylib/msgp v1.1.9
@@ -16,7 +15,6 @@ require (
 	go.opentelemetry.io/collector/connector v0.95.0
 	go.opentelemetry.io/collector/exporter v0.95.0
 	go.opentelemetry.io/collector/exporter/debugexporter v0.95.0
-	go.opentelemetry.io/collector/featuregate v1.2.0
 	go.opentelemetry.io/collector/otelcol v0.95.0
 	go.opentelemetry.io/collector/processor v0.95.0
 	go.opentelemetry.io/collector/processor/batchprocessor v0.95.0
@@ -113,6 +111,7 @@ require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/ecsutil v0.95.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/common v0.95.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.95.0 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/datadog v0.95.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/filter v0.95.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig v0.95.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/metadataproviders v0.95.0 // indirect
@@ -161,6 +160,7 @@ require (
 	go.opentelemetry.io/collector/consumer v0.95.0 // indirect
 	go.opentelemetry.io/collector/extension v0.95.0 // indirect
 	go.opentelemetry.io/collector/extension/auth v0.95.0 // indirect
+	go.opentelemetry.io/collector/featuregate v1.2.0 // indirect
 	go.opentelemetry.io/collector/pdata v1.2.0 // indirect
 	go.opentelemetry.io/collector/semconv v0.95.0 // indirect
 	go.opentelemetry.io/collector/service v0.95.0 // indirect

exporter/datadogexporter/integrationtest/integration_test.go

@@ -24,7 +24,6 @@ import (
 	"go.opentelemetry.io/collector/connector"
 	"go.opentelemetry.io/collector/exporter"
 	"go.opentelemetry.io/collector/exporter/debugexporter"
-	"go.opentelemetry.io/collector/featuregate"
 	"go.opentelemetry.io/collector/otelcol"
 	"go.opentelemetry.io/collector/otelcol/otelcoltest"
 	"go.opentelemetry.io/collector/processor"
@@ -42,103 +41,72 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/connector/datadogconnector"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/testutil"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/datadog"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/tailsamplingprocessor"
 )
 
 func TestIntegration(t *testing.T) {
-	tests := []struct {
-		name               string
-		featureGateEnabled bool
-	}{
-		{
-			name:               "with feature gate enabled",
-			featureGateEnabled: true,
-		},
-		{
-			name:               "with feature gate disabled",
-			featureGateEnabled: false,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			// 1. Set up mock Datadog server
-			// See also https://github.com/DataDog/datadog-agent/blob/49c16e0d4deab396626238fa1d572b684475a53f/cmd/trace-agent/test/backend.go
-			apmstatsRec := &testutil.HTTPRequestRecorderWithChan{Pattern: testutil.APMStatsEndpoint, ReqChan: make(chan []byte)}
-			tracesRec := &testutil.HTTPRequestRecorderWithChan{Pattern: testutil.TraceEndpoint, ReqChan: make(chan []byte)}
-			server := testutil.DatadogServerMock(apmstatsRec.HandlerFunc, tracesRec.HandlerFunc)
-			defer server.Close()
+	// 1. Set up mock Datadog server
+	// See also https://github.com/DataDog/datadog-agent/blob/49c16e0d4deab396626238fa1d572b684475a53f/cmd/trace-agent/test/backend.go
+	apmstatsRec := &testutil.HTTPRequestRecorderWithChan{Pattern: testutil.APMStatsEndpoint, ReqChan: make(chan []byte)}
+	tracesRec := &testutil.HTTPRequestRecorderWithChan{Pattern: testutil.TraceEndpoint, ReqChan: make(chan []byte)}
+	server := testutil.DatadogServerMock(apmstatsRec.HandlerFunc, tracesRec.HandlerFunc)
+	defer server.Close()
 
-			// 2. Start in-process collector
-			factories := getIntegrationTestComponents(t)
-			app, confFilePath := getIntegrationTestCollector(t, server.URL, factories)
-			if tt.featureGateEnabled {
-				err := featuregate.GlobalRegistry().Set(datadog.ConnectorPerformanceFeatureGate.ID(), true)
-				assert.NoError(t, err)
-				defer func() {
-					_ = featuregate.GlobalRegistry().Set(datadog.ConnectorPerformanceFeatureGate.ID(), false)
-				}()
-			}
-			go func() {
-				assert.NoError(t, app.Run(context.Background()))
-			}()
-			defer app.Shutdown()
-			defer os.Remove(confFilePath)
-			waitForReadiness(app)
+	// 2. Start in-process collector
+	factories := getIntegrationTestComponents(t)
+	app, confFilePath := getIntegrationTestCollector(t, server.URL, factories)
+	go func() {
+		assert.NoError(t, app.Run(context.Background()))
+	}()
+	defer app.Shutdown()
+	defer os.Remove(confFilePath)
+	waitForReadiness(app)
 
-			// 3. Generate and send traces
-			sendTraces(t)
+	// 3. Generate and send traces
+	sendTraces(t)
 
-			// 4. Validate traces and APM stats from the mock server
-			var spans []*pb.Span
-			var stats []*pb.ClientGroupedStats
+	// 4. Validate traces and APM stats from the mock server
+	var spans []*pb.Span
+	var stats []*pb.ClientGroupedStats
 
-			// 5 sampled spans + APM stats on 10 spans are sent to datadog exporter
-			for len(spans) < 5 || len(stats) < 10 {
-				select {
-				case tracesBytes := <-tracesRec.ReqChan:
-					gz := getGzipReader(t, tracesBytes)
-					slurp, err := io.ReadAll(gz)
-					require.NoError(t, err)
-					var traces pb.AgentPayload
-					require.NoError(t, proto.Unmarshal(slurp, &traces))
-					for _, tps := range traces.TracerPayloads {
-						for _, chunks := range tps.Chunks {
-							spans = append(spans, chunks.Spans...)
-							for _, span := range chunks.Spans {
-								assert.Equal(t, "true", span.Meta["_dd.stats_computed"])
-							}
-						}
-					}
+	// 5 sampled spans + APM stats on 10 spans are sent to datadog exporter
+	for len(spans) < 5 || len(stats) < 10 {
+		select {
+		case tracesBytes := <-tracesRec.ReqChan:
+			gz := getGzipReader(t, tracesBytes)
+			slurp, err := io.ReadAll(gz)
+			require.NoError(t, err)
+			var traces pb.AgentPayload
+			require.NoError(t, proto.Unmarshal(slurp, &traces))
+			for _, tps := range traces.TracerPayloads {
+				for _, chunks := range tps.Chunks {
+					spans = append(spans, chunks.Spans...)
+				}
+			}
 
-				case apmstatsBytes := <-apmstatsRec.ReqChan:
-					gz := getGzipReader(t, apmstatsBytes)
-					var spl pb.StatsPayload
-					require.NoError(t, msgp.Decode(gz, &spl))
-					for _, csps := range spl.Stats {
-						assert.Equal(t, "datadogexporter-otelcol-tests", spl.AgentVersion)
-						for _, csbs := range csps.Stats {
-							stats = append(stats, csbs.Stats...)
-							for _, stat := range csbs.Stats {
-								assert.True(t, strings.HasPrefix(stat.Resource, "TestSpan"))
-								assert.Equal(t, uint64(1), stat.Hits)
-								assert.Equal(t, uint64(1), stat.TopLevelHits)
-								if tt.featureGateEnabled {
-									// Peer tags aggregation is supported only when the feature gate is enabled (it's enabled by default)
-									assert.Equal(t, "client", stat.SpanKind)
-									assert.Equal(t, []string{"extra_peer_tag:tag_val", "peer.service:svc"}, stat.PeerTags)
-								}
-							}
-						}
+		case apmstatsBytes := <-apmstatsRec.ReqChan:
+			gz := getGzipReader(t, apmstatsBytes)
+			var spl pb.StatsPayload
+			require.NoError(t, msgp.Decode(gz, &spl))
+			for _, csps := range spl.Stats {
+				assert.Equal(t, "datadogexporter-otelcol-tests", spl.AgentVersion)
+				for _, csbs := range csps.Stats {
+					stats = append(stats, csbs.Stats...)
+					for _, stat := range csbs.Stats {
+						assert.True(t, strings.HasPrefix(stat.Resource, "TestSpan"))
+						assert.Equal(t, uint64(1), stat.Hits)
+						assert.Equal(t, uint64(1), stat.TopLevelHits)
+						assert.Equal(t, "client", stat.SpanKind)
+						assert.Equal(t, []string{"extra_peer_tag:tag_val", "peer.service:svc"}, stat.PeerTags)
 					}
 				}
 			}
-
-			// Verify we don't receive more than the expected numbers
-			assert.Len(t, spans, 5)
-			assert.Len(t, stats, 10)
-		})
+		}
 	}
+
+	// Verify we don't receive more than the expected numbers
+	assert.Len(t, spans, 5)
+	assert.Len(t, stats, 10)
 }
 
 func getIntegrationTestComponents(t *testing.T) otelcol.Factories {

exporter/datadogexporter/metrics_exporter.go

@@ -31,7 +31,6 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/metrics"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/metrics/sketches"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/datadogexporter/internal/scrub"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/datadog"
 )
 
 type metricsExporter struct {
@@ -86,9 +85,7 @@ func translatorFromConfig(set component.TelemetrySettings, cfg *Config, attrsTra
 	options = append(options, otlpmetrics.WithInitialCumulMonoValueMode(
 		otlpmetrics.InitialCumulMonoValueMode(cfg.Metrics.SumConfig.InitialCumulativeMonotonicMode)))
 
-	if datadog.ConnectorPerformanceFeatureGate.IsEnabled() {
-		options = append(options, otlpmetrics.WithStatsOut(statsOut))
-	}
+	options = append(options, otlpmetrics.WithStatsOut(statsOut))
 	return otlpmetrics.NewTranslator(set, attrsTranslator, options...)
 }
 

internal/datadog/agent.go

@@ -36,11 +36,11 @@ type TraceAgent struct {
 	exit chan struct{}
 }
 
-// ConnectorPerformanceFeatureGate uses optimized code paths for the Datadog Connector.
-var ConnectorPerformanceFeatureGate = featuregate.GlobalRegistry().MustRegister(
+var _ = featuregate.GlobalRegistry().MustRegister(
 	"connector.datadogconnector.performance",
-	featuregate.StageBeta,
+	featuregate.StageStable,
 	featuregate.WithRegisterDescription("Datadog Connector will use optimized code"),
+	featuregate.WithRegisterToVersion("0.97.0"),
 )
 
 // newAgent creates a new unstarted traceagent using the given context. Call Start to start the traceagent.