[chore] processor/metricsgenerationprocessor: migrate feature gate to mdatagen

.golangci.yml

@@ -203,9 +203,6 @@ linters:
       - linters:
           - forbidigo
         path: processor/filterprocessor/
-      - linters:
-          - forbidigo
-        path: processor/metricsgenerationprocessor/
       - linters:
           - forbidigo
         path: processor/tailsamplingprocessor/

processor/metricsgenerationprocessor/documentation.md

@@ -0,0 +1,13 @@
+[comment]: <> (Code generated by mdatagen. DO NOT EDIT.)
+
+# metricsgeneration
+
+## Feature Gates
+
+This component has the following feature gates:
+
+| Feature Gate | Stage | Description | From Version | To Version | Reference |
+| ------------ | ----- | ----------- | ------------ | ---------- | --------- |
+| `metricsgeneration.MatchAttributes` | alpha | When enabled, the metric calculations will only be done between data points whose attributes match. | v0.112.0 | N/A | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35425) |
+
+For more information about feature gates, see the [Feature Gates](https://github.com/open-telemetry/opentelemetry-collector/blob/main/featuregate/README.md) documentation.

processor/metricsgenerationprocessor/metadata.yaml

@@ -8,5 +8,12 @@ status:
   distributions: [contrib]
   codeowners:
     active: [Aneurysm9, crobert-1]
+feature_gates:
+  - id: metricsgeneration.MatchAttributes
+    description: >-
+      When enabled, the metric calculations will only be done between data points whose attributes match.
+    stage: alpha
+    from_version: "v0.112.0"
+    reference_url: https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35425
 tests:
   config:

processor/metricsgenerationprocessor/processor.go

@@ -8,17 +8,10 @@ import (
 	"fmt"
 
 	"go.opentelemetry.io/collector/component"
-	"go.opentelemetry.io/collector/featuregate"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 	"go.uber.org/zap"
-)
 
-var matchAttributes = featuregate.GlobalRegistry().MustRegister(
-	"metricsgeneration.MatchAttributes",
-	featuregate.StageAlpha,
-	featuregate.WithRegisterDescription("When enabled, the metric calculations will only be done between data points whose attributes match."),
-	featuregate.WithRegisterReferenceURL("https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35425"),
-	featuregate.WithRegisterFromVersion("v0.112.0"),
+	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/metricsgenerationprocessor/internal/metadata"
 )
 
 type metricsGenerationProcessor struct {
@@ -78,7 +71,7 @@ func (mgp *metricsGenerationProcessor) processMetrics(_ context.Context, md pmet
 					continue
 				}
 
-				if matchAttributes.IsEnabled() {
+				if metadata.MetricsgenerationMatchAttributesFeatureGate.IsEnabled() {
 					generateCalculatedMetrics(rm, metric2, rule, mgp.logger)
 				} else {
 					// When matching metric attributes isn't required the value of the first data point of metric2 is

processor/metricsgenerationprocessor/processor_test.go

@@ -293,7 +293,9 @@ func TestMetricsGenerationProcessor(t *testing.T) {
 			ctx := t.Context()
 			require.NoError(t, mgp.Start(ctx, nil))
 
-			cErr := mgp.ConsumeMetrics(t.Context(), test.inMetrics)
+			inputCopy := pmetric.NewMetrics()
+			test.inMetrics.CopyTo(inputCopy)
+			cErr := mgp.ConsumeMetrics(t.Context(), inputCopy)
 			assert.NoError(t, cErr)
 			got := next.AllMetrics()
 
@@ -514,7 +516,7 @@ func TestGoldenFileMetrics(t *testing.T) {
 
 	for _, testCase := range testCaseNames {
 		t.Run(testCase.name, func(t *testing.T) {
-			require.NoError(t, featuregate.GlobalRegistry().Set(matchAttributes.ID(), testCase.matchAttributesFlagEnabled))
+			require.NoError(t, featuregate.GlobalRegistry().Set(metadata.MetricsgenerationMatchAttributesFeatureGate.ID(), testCase.matchAttributesFlagEnabled))
 
 			cm, err := confmaptest.LoadConf(filepath.Join("testdata", testCase.testDir, "config.yaml"))
 			assert.NoError(t, err)