[chore] remove unnecessary error formatting when not needed (open-tel…

…emetry#35589)

Signed-off-by: Bogdan Drutu <[email protected]>

processor/transformprocessor/internal/metrics/func_extract_count_metric.go

@@ -13,12 +13,14 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl/contexts/ottlmetric"
 )
 
+const sumCountName = "extract_count_metric"
+
 type extractCountMetricArguments struct {
 	Monotonic bool
 }
 
 func newExtractCountMetricFactory() ottl.Factory[ottlmetric.TransformContext] {
-	return ottl.NewFactory("extract_count_metric", &extractCountMetricArguments{}, createExtractCountMetricFunction)
+	return ottl.NewFactory(sumCountName, &extractCountMetricArguments{}, createExtractCountMetricFunction)
 }
 
 func createExtractCountMetricFunction(_ ottl.FunctionContext, oArgs ottl.Arguments) (ottl.ExprFunc[ottlmetric.TransformContext], error) {
@@ -34,11 +36,10 @@ func createExtractCountMetricFunction(_ ottl.FunctionContext, oArgs ottl.Argumen
 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
+			return nil, invalidMetricTypeError(sumCountName, metric)
 		}
 
 		countMetric := pmetric.NewMetric()
@@ -66,7 +67,7 @@ func extractCountMetric(monotonic bool) (ottl.ExprFunc[ottlmetric.TransformConte
 				addCountDataPoint(dataPoints.At(i), countMetric.Sum().DataPoints())
 			}
 		default:
-			return nil, invalidMetricTypeError
+			return nil, invalidMetricTypeError(sumCountName, metric)
 		}
 
 		if countMetric.Sum().DataPoints().Len() > 0 {

processor/transformprocessor/internal/metrics/func_extract_sum_metric.go

@@ -14,12 +14,14 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/ottl/contexts/ottlmetric"
 )
 
+const sumFuncName = "extract_sum_metric"
+
 type extractSumMetricArguments struct {
 	Monotonic bool
 }
 
 func newExtractSumMetricFactory() ottl.Factory[ottlmetric.TransformContext] {
-	return ottl.NewFactory("extract_sum_metric", &extractSumMetricArguments{}, createExtractSumMetricFunction)
+	return ottl.NewFactory(sumFuncName, &extractSumMetricArguments{}, createExtractSumMetricFunction)
 }
 
 func createExtractSumMetricFunction(_ ottl.FunctionContext, oArgs ottl.Arguments) (ottl.ExprFunc[ottlmetric.TransformContext], error) {
@@ -45,11 +47,9 @@ type SumCountDataPoint interface {
 func extractSumMetric(monotonic bool) (ottl.ExprFunc[ottlmetric.TransformContext], error) {
 	return func(_ context.Context, tCtx ottlmetric.TransformContext) (any, error) {
 		metric := tCtx.GetMetric()
-		invalidMetricTypeError := fmt.Errorf("extract_sum_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
+			return nil, invalidMetricTypeError(sumFuncName, metric)
 		}
 
 		sumMetric := pmetric.NewMetric()
@@ -83,7 +83,7 @@ func extractSumMetric(monotonic bool) (ottl.ExprFunc[ottlmetric.TransformContext
 				addSumDataPoint(dataPoints.At(i), sumMetric.Sum().DataPoints())
 			}
 		default:
-			return nil, invalidMetricTypeError
+			return nil, invalidMetricTypeError(sumFuncName, metric)
 		}
 
 		if sumMetric.Sum().DataPoints().Len() > 0 {
@@ -116,3 +116,7 @@ func getAggregationTemporality(metric pmetric.Metric) pmetric.AggregationTempora
 		return pmetric.AggregationTemporalityUnspecified
 	}
 }
+
+func invalidMetricTypeError(name string, metric pmetric.Metric) error {
+	return fmt.Errorf("%s requires an input metric of type Histogram, ExponentialHistogram or Summary, got %s", name, metric.Type())
+}