[exporter/awsemf] Add feature gate for default dimension rollup

.chloggen/awsemf_defaultrollup.yaml

@@ -0,0 +1,22 @@
+# Use this changelog template to create an entry for release notes.
+# If your change doesn't affect end users, such as a test fix or a tooling change,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+
+# 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: awsemfexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add awsemf.nodimrollupdefault feature gate to aws emf exporter
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [23997]
+
+# (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: |
+  Enabling the awsemf.nodimrollupdefault will cause the AWS EMF Exporter to use the NoDimensionRollup configuration
+  setting by default instead of ZeroAndSingleDimensionRollup.

exporter/awsemfexporter/config_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/confmap/confmaptest"
+	"go.opentelemetry.io/collector/featuregate"
 	"go.uber.org/zap"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/awsemfexporter/internal/metadata"
@@ -260,3 +261,12 @@ func TestValidateTags(t *testing.T) {
 		})
 	}
 }
+
+func TestNoDimensionRollupFeatureGate(t *testing.T) {
+	err := featuregate.GlobalRegistry().Set("awsemf.nodimrollupdefault", true)
+	require.NoError(t, err)
+	cfg := createDefaultConfig()
+
+	assert.Equal(t, cfg.(*Config).DimensionRollupOption, "NoDimensionRollup")
+	_ = featuregate.GlobalRegistry().Set("awsemf.nodimrollupdefault", false)
+}

exporter/awsemfexporter/emf_exporter.go

@@ -71,6 +71,10 @@ func newEmfExporter(config *Config, set exporter.CreateSettings) (*emfExporter,
 		pusherMap:        map[cwlogs.PusherKey]cwlogs.Pusher{},
 	}
 
+	config.logger.Warn("the default value for DimensionRollupOption will be changing to NoDimensionRollup" +
+		"in a future release. See https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/23997 for more" +
+		"information")
+
 	return emfExporter, nil
 }
 

exporter/awsemfexporter/emf_exporter_test.go

@@ -589,6 +589,12 @@ func TestNewExporterWithMetricDeclarations(t *testing.T) {
 
 	// Test output warning logs
 	expectedLogs := []observer.LoggedEntry{
+		{
+			Entry: zapcore.Entry{Level: zap.WarnLevel, Message: "the default value for DimensionRollupOption will be changing to NoDimensionRollup" +
+				"in a future release. See https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/23997 for more" +
+				"information"},
+			Context: []zapcore.Field{},
+		},
 		{
 			Entry:   zapcore.Entry{Level: zap.WarnLevel, Message: "Dropped metric declaration."},
 			Context: []zapcore.Field{zap.Error(errors.New("invalid metric declaration: no metric name selectors defined"))},
@@ -598,7 +604,7 @@ func TestNewExporterWithMetricDeclarations(t *testing.T) {
 			Context: []zapcore.Field{zap.String("dimensions", "a,b,c,d,e,f,g,h,i,j,k")},
 		},
 	}
-	assert.Equal(t, 2, logs.Len())
+	assert.Equal(t, len(expectedLogs), logs.Len())
 	assert.Equal(t, expectedLogs, logs.AllUntimed())
 }
 

exporter/awsemfexporter/factory.go

@@ -9,13 +9,19 @@ import (
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/exporter"
 	"go.opentelemetry.io/collector/exporter/exporterhelper"
+	"go.opentelemetry.io/collector/featuregate"
 	"go.uber.org/zap"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/awsemfexporter/internal/metadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/awsutil"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/resourcetotelemetry"
 )
 
+var defaultNoRollupfg = featuregate.GlobalRegistry().MustRegister("awsemf.nodimrollupdefault", featuregate.StageAlpha,
+	featuregate.WithRegisterFromVersion("v0.82.0"),
+	featuregate.WithRegisterDescription("Changes the default AWS EMF Exporter Dimension rollup option to "+
+		"NoDimensionRollup"))
+
 // NewFactory creates a factory for AWS EMF exporter.
 func NewFactory() exporter.Factory {
 	return exporter.NewFactory(
@@ -26,12 +32,18 @@ func NewFactory() exporter.Factory {
 
 // CreateDefaultConfig creates the default configuration for exporter.
 func createDefaultConfig() component.Config {
+	var defaultDimensionRollupOption string
+	if defaultNoRollupfg.IsEnabled() {
+		defaultDimensionRollupOption = "NoDimensionRollup"
+	} else {
+		defaultDimensionRollupOption = "ZeroAndSingleDimensionRollup"
+	}
 	return &Config{
 		AWSSessionSettings:              awsutil.CreateDefaultSessionConfig(),
 		LogGroupName:                    "",
 		LogStreamName:                   "",
 		Namespace:                       "",
-		DimensionRollupOption:           "ZeroAndSingleDimensionRollup",
+		DimensionRollupOption:           defaultDimensionRollupOption,
 		Version:                         "1",
 		RetainInitialValueOfDeltaMetric: false,
 		OutputDestination:               "cloudwatch",

exporter/awsemfexporter/go.mod

@@ -17,6 +17,7 @@ require (
 	go.opentelemetry.io/collector/confmap v0.82.0
 	go.opentelemetry.io/collector/consumer v0.82.0
 	go.opentelemetry.io/collector/exporter v0.82.0
+	go.opentelemetry.io/collector/featuregate v1.0.0-rcv0014
 	go.opentelemetry.io/collector/pdata v1.0.0-rcv0014
 	go.opentelemetry.io/collector/semconv v0.82.0
 	go.uber.org/zap v1.24.0
@@ -45,7 +46,6 @@ require (
 	go.opentelemetry.io/collector v0.82.0 // indirect
 	go.opentelemetry.io/collector/config/configtelemetry v0.82.0 // indirect
 	go.opentelemetry.io/collector/extension v0.82.0 // indirect
-	go.opentelemetry.io/collector/featuregate v1.0.0-rcv0014 // indirect
 	go.opentelemetry.io/collector/processor v0.82.0 // indirect
 	go.opentelemetry.io/collector/receiver v0.82.0 // indirect
 	go.opentelemetry.io/otel v1.16.0 // indirect