[chore]: [deltatocumulative]: remove nested implementation (#36498)

#### Description

Removes the nested (aka overloading `streams.Map`) implementation.

This has been entirely replaced by a leaner, "linear" implementation:
-
#35048
-
#36486

<!--Describe what testing was performed and which tests were added.-->
#### Testing

Existing tests continue to pass unaltered

<!--Describe the documentation added.-->
#### Documentation

not needed

<!--Please delete paragraphs that you did not use before submitting.-->

processor/deltatocumulativeprocessor/config.go

@@ -11,7 +11,7 @@ import (
 
 	"go.opentelemetry.io/collector/component"
 
-	telemetry "github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/lineartelemetry"
+	telemetry "github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/telemetry"
 )
 
 var _ component.ConfigValidator = (*Config)(nil)

processor/deltatocumulativeprocessor/factory.go

@@ -11,8 +11,8 @@ import (
 	"go.opentelemetry.io/collector/consumer"
 	"go.opentelemetry.io/collector/processor"
 
-	ltel "github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/lineartelemetry"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/metadata"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/telemetry"
 )
 
 func NewFactory() processor.Factory {
@@ -29,13 +29,10 @@ func createMetricsProcessor(_ context.Context, set processor.Settings, cfg compo
 		return nil, fmt.Errorf("configuration parsing error")
 	}
 
-	ltel, err := ltel.New(set.TelemetrySettings)
+	tel, err := telemetry.New(set.TelemetrySettings)
 	if err != nil {
 		return nil, err
 	}
 
-	proc := newProcessor(pcfg, set.Logger, &ltel.TelemetryBuilder, next)
-	linear := newLinear(pcfg, ltel, proc)
-
-	return Chain{linear, proc}, nil
+	return newProcessor(pcfg, tel, next), nil
 }

processor/deltatocumulativeprocessor/go.mod

@@ -21,7 +21,6 @@ require (
 	go.opentelemetry.io/otel/sdk/metric v1.32.0
 	go.opentelemetry.io/otel/trace v1.32.0
 	go.uber.org/goleak v1.3.0
-	go.uber.org/zap v1.27.0
 	golang.org/x/tools v0.26.0
 	gopkg.in/yaml.v3 v3.0.1
 )
@@ -52,6 +51,7 @@ require (
 	go.opentelemetry.io/collector/processor/processorprofiles v0.114.1-0.20241202231142-b9ff1bc54c99 // indirect
 	go.opentelemetry.io/otel/sdk v1.32.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/net v0.30.0 // indirect
 	golang.org/x/sys v0.27.0 // indirect
 	golang.org/x/text v0.19.0 // indirect

processor/deltatocumulativeprocessor/internal/data/data.go

@@ -4,116 +4,23 @@
 package data // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/data"
 
 import (
-	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/data/expo"
 )
 
-var (
-	_ Point[Number]       = Number{}
-	_ Point[Histogram]    = Histogram{}
-	_ Point[ExpHistogram] = ExpHistogram{}
-	_ Point[Summary]      = Summary{}
-)
-
-type Point[Self any] interface {
-	StartTimestamp() pcommon.Timestamp
-	Timestamp() pcommon.Timestamp
-	Attributes() pcommon.Map
-
-	Clone() Self
-	CopyTo(Self)
-
-	Add(Self) Self
-}
-
-type Typed[Self any] interface {
-	Point[Self]
-	Number | Histogram | ExpHistogram | Summary
-}
-
 type Number struct {
 	pmetric.NumberDataPoint
 }
 
-func Zero[P Typed[P]]() P {
-	var point P
-	switch ty := any(&point).(type) {
-	case *Number:
-		ty.NumberDataPoint = pmetric.NewNumberDataPoint()
-	case *Histogram:
-		ty.HistogramDataPoint = pmetric.NewHistogramDataPoint()
-	case *ExpHistogram:
-		ty.DataPoint = pmetric.NewExponentialHistogramDataPoint()
-	}
-	return point
-}
-
-func (dp Number) Clone() Number {
-	clone := Number{NumberDataPoint: pmetric.NewNumberDataPoint()}
-	if dp.NumberDataPoint != (pmetric.NumberDataPoint{}) {
-		dp.CopyTo(clone)
-	}
-	return clone
-}
-
-func (dp Number) CopyTo(dst Number) {
-	dp.NumberDataPoint.CopyTo(dst.NumberDataPoint)
-}
-
 type Histogram struct {
 	pmetric.HistogramDataPoint
 }
 
-func (dp Histogram) Clone() Histogram {
-	clone := Histogram{HistogramDataPoint: pmetric.NewHistogramDataPoint()}
-	if dp.HistogramDataPoint != (pmetric.HistogramDataPoint{}) {
-		dp.CopyTo(clone)
-	}
-	return clone
-}
-
-func (dp Histogram) CopyTo(dst Histogram) {
-	dp.HistogramDataPoint.CopyTo(dst.HistogramDataPoint)
-}
-
 type ExpHistogram struct {
 	expo.DataPoint
 }
 
-func (dp ExpHistogram) Clone() ExpHistogram {
-	clone := ExpHistogram{DataPoint: pmetric.NewExponentialHistogramDataPoint()}
-	if dp.DataPoint != (expo.DataPoint{}) {
-		dp.CopyTo(clone)
-	}
-	return clone
-}
-
-func (dp ExpHistogram) CopyTo(dst ExpHistogram) {
-	dp.DataPoint.CopyTo(dst.DataPoint)
-}
-
-type mustPoint[D Point[D]] struct{ _ D }
-
-var (
-	_ = mustPoint[Number]{}
-	_ = mustPoint[Histogram]{}
-	_ = mustPoint[ExpHistogram]{}
-)
-
 type Summary struct {
 	pmetric.SummaryDataPoint
 }
-
-func (dp Summary) Clone() Summary {
-	clone := Summary{SummaryDataPoint: pmetric.NewSummaryDataPoint()}
-	if dp.SummaryDataPoint != (pmetric.SummaryDataPoint{}) {
-		dp.CopyTo(clone)
-	}
-	return clone
-}
-
-func (dp Summary) CopyTo(dst Summary) {
-	dp.SummaryDataPoint.CopyTo(dst.SummaryDataPoint)
-}

processor/deltatocumulativeprocessor/internal/delta/delta.go

@@ -9,55 +9,9 @@ import (
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 
-	exp "github.com/open-telemetry/opentelemetry-collector-contrib/internal/exp/metrics/streams"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/data"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/deltatocumulativeprocessor/internal/streams"
 )
 
-func New[D data.Point[D]]() Accumulator[D] {
-	return Accumulator[D]{
-		Map: make(exp.HashMap[D]),
-	}
-}
-
-var _ streams.Map[data.Number] = (*Accumulator[data.Number])(nil)
-
-type Accumulator[D data.Point[D]] struct {
-	streams.Map[D]
-}
-
-func (a Accumulator[D]) Store(id streams.Ident, dp D) error {
-	aggr, ok := a.Map.Load(id)
-
-	// new series: initialize with current sample
-	if !ok {
-		clone := dp.Clone()
-		return a.Map.Store(id, clone)
-	}
-
-	// drop bad samples
-	switch {
-	case dp.StartTimestamp() < aggr.StartTimestamp():
-		// belongs to older series
-		return ErrOlderStart{Start: aggr.StartTimestamp(), Sample: dp.StartTimestamp()}
-	case dp.Timestamp() <= aggr.Timestamp():
-		// out of order
-		return ErrOutOfOrder{Last: aggr.Timestamp(), Sample: dp.Timestamp()}
-	}
-
-	// detect gaps
-	var gap error
-	if dp.StartTimestamp() > aggr.Timestamp() {
-		gap = ErrGap{From: aggr.Timestamp(), To: dp.StartTimestamp()}
-	}
-
-	res := aggr.Add(dp)
-	if err := a.Map.Store(id, res); err != nil {
-		return err
-	}
-	return gap
-}
-
 type ErrOlderStart struct {
 	Start  pcommon.Timestamp
 	Sample pcommon.Timestamp
@@ -76,14 +30,6 @@ func (e ErrOutOfOrder) Error() string {
 	return fmt.Sprintf("out of order: dropped sample from time=%s, because series is already at time=%s", e.Sample, e.Last)
 }
 
-type ErrGap struct {
-	From, To pcommon.Timestamp
-}
-
-func (e ErrGap) Error() string {
-	return fmt.Sprintf("gap in stream from %s to %s. samples were likely lost in transit", e.From, e.To)
-}
-
 type Type interface {
 	pmetric.NumberDataPoint | pmetric.HistogramDataPoint | pmetric.ExponentialHistogramDataPoint