Remove duplicate metrics from memorylimiter

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ## 🛑 Breaking changes 🛑
 
+- Remove legacy internal metrics for memorylimiter processor, `spans_dropped` and `trace_batches_dropped` (#2841)
+  - For `spans_dropped` use `processor/refused_spans` with `processor=memorylimiter`
 - Rename pdata.*.[Start|End]Time to pdata.*.[Start|End]Timestamp (#2847)
 - Rename pdata.DoubleExemplar to pdata.Exemplar (#2804)
 - Rename pdata.DoubleHistogram to pdata.Histogram (#2797)

processor/batchprocessor/batch_processor.go

@@ -27,7 +27,6 @@ import (
 	"go.opentelemetry.io/collector/config/configtelemetry"
 	"go.opentelemetry.io/collector/consumer"
 	"go.opentelemetry.io/collector/consumer/pdata"
-	"go.opentelemetry.io/collector/processor"
 )
 
 // batch_processor is a component that accepts spans and metrics, places them
@@ -199,7 +198,7 @@ func (bp *batchProcessor) resetTimer() {
 
 func (bp *batchProcessor) sendItems(measure *stats.Int64Measure) {
 	// Add that it came form the trace pipeline?
-	statsTags := []tag.Mutator{tag.Insert(processor.TagProcessorNameKey, bp.name)}
+	statsTags := []tag.Mutator{tag.Insert(processorTagKey, bp.name)}
 	_ = stats.RecordWithTags(context.Background(), statsTags, measure.M(1), statBatchSendSize.M(int64(bp.batch.itemCount())))
 
 	if bp.telemetryLevel == configtelemetry.LevelDetailed {

processor/batchprocessor/metrics.go

@@ -20,10 +20,10 @@ import (
 	"go.opencensus.io/tag"
 
 	"go.opentelemetry.io/collector/obsreport"
-	"go.opentelemetry.io/collector/processor"
 )
 
 var (
+	processorTagKey          = tag.MustNewKey(obsreport.ProcessorKey)
 	statBatchSizeTriggerSend = stats.Int64("batch_size_trigger_send", "Number of times the batch was sent due to a size trigger", stats.UnitDimensionless)
 	statTimeoutTriggerSend   = stats.Int64("timeout_trigger_send", "Number of times the batch was sent due to a timeout trigger", stats.UnitDimensionless)
 	statBatchSendSize        = stats.Int64("batch_send_size", "Number of units in the batch", stats.UnitDimensionless)
@@ -32,7 +32,7 @@ var (
 
 // MetricViews returns the metrics views related to batching
 func MetricViews() []*view.View {
-	processorTagKeys := []tag.Key{processor.TagProcessorNameKey}
+	processorTagKeys := []tag.Key{processorTagKey}
 
 	countBatchSizeTriggerSendView := &view.View{
 		Name:        statBatchSizeTriggerSend.Name(),

processor/memorylimiter/memorylimiter.go

@@ -22,13 +22,11 @@ import (
 	"sync/atomic"
 	"time"
 
-	"go.opencensus.io/stats"
 	"go.uber.org/zap"
 
 	"go.opentelemetry.io/collector/config/configtelemetry"
 	"go.opentelemetry.io/collector/consumer/pdata"
 	"go.opentelemetry.io/collector/obsreport"
-	"go.opentelemetry.io/collector/processor"
 	"go.opentelemetry.io/collector/processor/memorylimiter/internal/iruntime"
 )
 
@@ -155,11 +153,6 @@ func (ml *memoryLimiter) shutdown(context.Context) error {
 func (ml *memoryLimiter) ProcessTraces(ctx context.Context, td pdata.Traces) (pdata.Traces, error) {
 	numSpans := td.SpanCount()
 	if ml.forcingDrop() {
-		stats.Record(
-			ctx,
-			processor.StatDroppedSpanCount.M(int64(numSpans)),
-			processor.StatTraceBatchesDroppedCount.M(1))
-
 		// TODO: actually to be 100% sure that this is "refused" and not "dropped"
 		// 	it is necessary to check the pipeline to see if this is directly connected
 		// 	to a receiver (ie.: a receiver is on the call stack). For now it

service/telemetry.go

@@ -28,7 +28,6 @@ import (
 	"go.opentelemetry.io/collector/exporter/jaegerexporter"
 	"go.opentelemetry.io/collector/internal/collector/telemetry"
 	"go.opentelemetry.io/collector/obsreport"
-	"go.opentelemetry.io/collector/processor"
 	"go.opentelemetry.io/collector/processor/batchprocessor"
 	"go.opentelemetry.io/collector/receiver/kafkareceiver"
 	telemetry2 "go.opentelemetry.io/collector/service/internal/telemetry"
@@ -67,7 +66,6 @@ func (tel *appTelemetry) init(asyncErrorChannel chan<- error, ballastSizeBytes u
 	views = append(views, kafkareceiver.MetricViews()...)
 	views = append(views, obsreport.Configure(level)...)
 	views = append(views, processMetricsViews.Views()...)
-	views = append(views, processor.MetricViews()...)
 
 	tel.views = views
 	if err = view.Register(views...); err != nil {