[telemetrygen] Add support to set metric name

.chloggen/add-metric-name.yaml

@@ -0,0 +1,22 @@
+# 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: telemetrygen
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add support to set metric name
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [32840]
+
+# 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: [user]

cmd/telemetrygen/internal/metrics/config.go

@@ -13,12 +13,14 @@ import (
 type Config struct {
 	common.Config
 	NumMetrics int
+	MetricName string
 	MetricType metricType
 }
 
 // Flags registers config flags.
 func (c *Config) Flags(fs *pflag.FlagSet) {
 	// Use Gauge as default metric type.
+	c.MetricName = "gen"
 	c.MetricType = metricTypeGauge
 
 	c.CommonFlags(fs)

cmd/telemetrygen/internal/metrics/metrics.go

@@ -93,6 +93,7 @@ func Run(c *Config, exp func() (sdkmetric.Exporter, error), logger *zap.Logger)
 		wg.Add(1)
 		w := worker{
 			numMetrics:     c.NumMetrics,
+			metricName:     c.MetricName,
 			metricType:     c.MetricType,
 			limitPerSecond: limit,
 			totalDuration:  c.TotalDuration,

cmd/telemetrygen/internal/metrics/worker.go

@@ -19,6 +19,7 @@ import (
 
 type worker struct {
 	running        *atomic.Bool    // pointer to shared flag that indicates it's time to stop the test
+	metricName     string          // name of metric to generate
 	metricType     metricType      // type of metric to generate
 	numMetrics     int             // how many metrics the worker has to generate (only when duration==0)
 	totalDuration  time.Duration   // how long to run the test for (overrides `numMetrics`)
@@ -51,7 +52,7 @@ func (w worker) simulateMetrics(res *resource.Resource, exporterFunc func() (sdk
 		switch w.metricType {
 		case metricTypeGauge:
 			metrics = append(metrics, metricdata.Metrics{
-				Name: "gen",
+				Name: w.metricName,
 				Data: metricdata.Gauge[int64]{
 					DataPoints: []metricdata.DataPoint[int64]{
 						{
@@ -64,7 +65,7 @@ func (w worker) simulateMetrics(res *resource.Resource, exporterFunc func() (sdk
 			})
 		case metricTypeSum:
 			metrics = append(metrics, metricdata.Metrics{
-				Name: "gen",
+				Name: w.metricName,
 				Data: metricdata.Sum[int64]{
 					IsMonotonic: true,
 					Temporality: metricdata.CumulativeTemporality,

cmd/telemetrygen/internal/metrics/worker_test.go

@@ -141,9 +141,10 @@ func TestSumNoTelemetryAttrs(t *testing.T) {
 	rms := m.rms
 	for i := 0; i < qty; i++ {
 		ms := rms[i].ScopeMetrics[0].Metrics[0]
+		assert.Equal(t, "test", ms.Name)
 		// @note update when telemetrygen allow other metric types
 		attr := ms.Data.(metricdata.Sum[int64]).DataPoints[0].Attributes
-		assert.Equal(t, attr.Len(), 0, "it shouldn't have attrs here")
+		assert.Equal(t, 0, attr.Len(), "it shouldn't have attrs here")
 	}
 }
 
@@ -168,9 +169,10 @@ func TestGaugeNoTelemetryAttrs(t *testing.T) {
 	rms := m.rms
 	for i := 0; i < qty; i++ {
 		ms := rms[i].ScopeMetrics[0].Metrics[0]
+		assert.Equal(t, "test", ms.Name)
 		// @note update when telemetrygen allow other metric types
 		attr := ms.Data.(metricdata.Gauge[int64]).DataPoints[0].Attributes
-		assert.Equal(t, attr.Len(), 0, "it shouldn't have attrs here")
+		assert.Equal(t, 0, attr.Len(), "it shouldn't have attrs here")
 	}
 }
 
@@ -195,9 +197,10 @@ func TestSumSingleTelemetryAttr(t *testing.T) {
 	rms := m.rms
 	for i := 0; i < qty; i++ {
 		ms := rms[i].ScopeMetrics[0].Metrics[0]
+		assert.Equal(t, "test", ms.Name)
 		// @note update when telemetrygen allow other metric types
 		attr := ms.Data.(metricdata.Sum[int64]).DataPoints[0].Attributes
-		assert.Equal(t, attr.Len(), 1, "it must have a single attribute here")
+		assert.Equal(t, 1, attr.Len(), "it must have a single attribute here")
 		actualValue, _ := attr.Value(telemetryAttrKeyOne)
 		assert.Equal(t, actualValue.AsString(), telemetryAttrValueOne, "it should be "+telemetryAttrValueOne)
 	}
@@ -224,9 +227,10 @@ func TestGaugeSingleTelemetryAttr(t *testing.T) {
 	rms := m.rms
 	for i := 0; i < qty; i++ {
 		ms := rms[i].ScopeMetrics[0].Metrics[0]
+		assert.Equal(t, "test", ms.Name)
 		// @note update when telemetrygen allow other metric types
 		attr := ms.Data.(metricdata.Gauge[int64]).DataPoints[0].Attributes
-		assert.Equal(t, attr.Len(), 1, "it must have a single attribute here")
+		assert.Equal(t, 1, attr.Len(), "it must have a single attribute here")
 		actualValue, _ := attr.Value(telemetryAttrKeyOne)
 		assert.Equal(t, actualValue.AsString(), telemetryAttrValueOne, "it should be "+telemetryAttrValueOne)
 	}
@@ -303,6 +307,7 @@ func configWithNoAttributes(metric metricType, qty int) *Config {
 			TelemetryAttributes: nil,
 		},
 		NumMetrics: qty,
+		MetricName: "test",
 		MetricType: metric,
 	}
 }
@@ -314,6 +319,7 @@ func configWithOneAttribute(metric metricType, qty int) *Config {
 			TelemetryAttributes: common.KeyValue{telemetryAttrKeyOne: telemetryAttrValueOne},
 		},
 		NumMetrics: qty,
+		MetricName: "test",
 		MetricType: metric,
 	}
 }