Remove internal entity fields for awsemfexporter (#271)

* Remove internal entity fields for emf_exporter

* Add test for internal entity field skipping

exporter/awsemfexporter/datapoint.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"math"
 	"strconv"
+	"strings"
 	"time"
 
 	"go.opentelemetry.io/collector/pdata/pcommon"
@@ -18,6 +19,8 @@ import (
 )
 
 const (
+	AWSEntityPrefix = "com.amazonaws.cloudwatch.entity.internal."
+
 	summaryCountSuffix = "_count"
 	summarySumSuffix   = "_sum"
 )
@@ -531,6 +534,11 @@ func (dps summaryDataPointSlice) IsStaleNaNInf(i int) (bool, pcommon.Map) {
 func createLabels(attributes pcommon.Map) map[string]string {
 	labels := make(map[string]string, attributes.Len()+1)
 	attributes.Range(func(k string, v pcommon.Value) bool {
+		// we don't want to export entity related attributes as dimensions, so we skip these
+		if strings.HasPrefix(k, AWSEntityPrefix) {
+			return true
+		}
+
 		labels[k] = v.AsString()
 		return true
 	})

exporter/awsemfexporter/datapoint_test.go

@@ -1940,6 +1940,7 @@ func TestCreateLabels(t *testing.T) {
 		"a": "A",
 		"b": "B",
 		"c": "C",
+		"com.amazonaws.cloudwatch.entity.internal.A": "A",
 	}))
 
 	labels := createLabels(labelsMap)