/
func_extract_count_metric.go
86 lines (70 loc) · 3.04 KB
/
func_extract_count_metric.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package metrics // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/transformprocessor/internal/metrics"
import (
"context"
"fmt"
"go.opentelemetry.io/collector/pdata/pmetric"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl/contexts/ottlmetric"
)
type extractCountMetricArguments struct {
Monotonic bool
}
func newExtractCountMetricFactory() ottl.Factory[ottlmetric.TransformContext] {
return ottl.NewFactory("extract_count_metric", &extractCountMetricArguments{}, createExtractCountMetricFunction)
}
func createExtractCountMetricFunction(_ ottl.FunctionContext, oArgs ottl.Arguments) (ottl.ExprFunc[ottlmetric.TransformContext], error) {
args, ok := oArgs.(*extractCountMetricArguments)
if !ok {
return nil, fmt.Errorf("extractCountMetricFactory args must be of type *extractCountMetricArguments")
}
return extractCountMetric(args.Monotonic)
}
func extractCountMetric(monotonic bool) (ottl.ExprFunc[ottlmetric.TransformContext], error) {
return func(_ context.Context, tCtx ottlmetric.TransformContext) (any, error) {
metric := tCtx.GetMetric()
invalidMetricTypeError := fmt.Errorf("extract_count_metric requires an input metric of type Histogram, ExponentialHistogram or Summary, got %s", metric.Type())
aggTemp := getAggregationTemporality(metric)
if aggTemp == pmetric.AggregationTemporalityUnspecified {
return nil, invalidMetricTypeError
}
countMetric := pmetric.NewMetric()
countMetric.SetDescription(metric.Description())
countMetric.SetName(metric.Name() + "_count")
// Use the default unit as the original metric unit does not apply to the 'count' field
countMetric.SetUnit("1")
countMetric.SetEmptySum().SetAggregationTemporality(aggTemp)
countMetric.Sum().SetIsMonotonic(monotonic)
switch metric.Type() {
case pmetric.MetricTypeHistogram:
dataPoints := metric.Histogram().DataPoints()
for i := 0; i < dataPoints.Len(); i++ {
addCountDataPoint(dataPoints.At(i), countMetric.Sum().DataPoints())
}
case pmetric.MetricTypeExponentialHistogram:
dataPoints := metric.ExponentialHistogram().DataPoints()
for i := 0; i < dataPoints.Len(); i++ {
addCountDataPoint(dataPoints.At(i), countMetric.Sum().DataPoints())
}
case pmetric.MetricTypeSummary:
dataPoints := metric.Summary().DataPoints()
for i := 0; i < dataPoints.Len(); i++ {
addCountDataPoint(dataPoints.At(i), countMetric.Sum().DataPoints())
}
default:
return nil, invalidMetricTypeError
}
if countMetric.Sum().DataPoints().Len() > 0 {
countMetric.MoveTo(tCtx.GetMetrics().AppendEmpty())
}
return nil, nil
}, nil
}
func addCountDataPoint(dataPoint SumCountDataPoint, destination pmetric.NumberDataPointSlice) {
newDp := destination.AppendEmpty()
dataPoint.Attributes().CopyTo(newDp.Attributes())
newDp.SetIntValue(int64(dataPoint.Count()))
newDp.SetStartTimestamp(dataPoint.StartTimestamp())
newDp.SetTimestamp(dataPoint.Timestamp())
}