use json for writing floats as strings

CHANGELOG.md

@@ -32,6 +32,7 @@
   - Deprecated `receiverhelper.NewFactory` in favour of `component.NewReceiverFactory`
 - Remove support for legacy otlp/http port. (#4916)
 - Remove deprecated funcs in pdata (#4809)
+- AsString for pdata.AttributeValue now returns the JSON-encoded string of floats. (#4934)
 
 ### 💡 Enhancements 💡
 

model/pdata/common.go

@@ -379,7 +379,8 @@ func (a AttributeValue) AsString() string {
 		return strconv.FormatBool(a.BoolVal())
 
 	case AttributeValueTypeDouble:
-		return strconv.FormatFloat(a.DoubleVal(), 'f', -1, 64)
+		jsonStr, _ := json.Marshal(a.DoubleVal())
+		return string(jsonStr)
 
 	case AttributeValueTypeInt:
 		return strconv.FormatInt(a.IntVal(), 10)

model/pdata/common_test.go

@@ -957,6 +957,11 @@ func TestAsString(t *testing.T) {
 			input:    NewAttributeValueDouble(1.61803399),
 			expected: "1.61803399",
 		},
+		{
+			name:     "small float64",
+			input:    NewAttributeValueDouble(.000000009),
+			expected: "9e-9",
+		},
 		{
 			name:     "boolean",
 			input:    NewAttributeValueBool(true),