OTel Log stdout Body shows as empty

[osherElm]

Description

I am trying to use OTel logger with simple stdout and the Body is just not outputted

Environment

• OS: Mac
• Architecture: ARM
• Go Version: 1.22
• opentelemetry-go version: Release v1.26.0/v0.48.0/v0.2.0-alpha

Steps To Reproduce

package main

import (
	"context"
	"fmt"
	"time"

	"go.opentelemetry.io/otel/exporters/stdout/stdoutlog"
	log2 "go.opentelemetry.io/otel/log"
	"go.opentelemetry.io/otel/sdk/log"
)

func main() {
	processor, err := stdoutlog.New()
	if err != nil {
		fmt.Println(err.Error())
		return
	}

	p := log.NewLoggerProvider(log.WithProcessor(log.NewBatchProcessor(processor)))
	l := p.Logger("test-stdout")

	r := log2.Record{}
	r.SetBody(log2.StringValue("This body will not show"))
	r.SetSeverityText("FATAL")
	r.SetSeverity(log2.SeverityFatal)
	l.Emit(context.Background(), r)

	time.Sleep(5 * time.Second)

}

Mod:

	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.51.0
	go.opentelemetry.io/otel v1.26.0
	go.opentelemetry.io/otel/metric v1.26.0
	go.opentelemetry.io/otel/trace v1.26.0

	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.0.0-20240506090312-e0ed6a3028be // indirect
	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.2.0-alpha // indirect
	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.26.0 // indirect
	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.26.0 // indirect
	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.26.0 // indirect
	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.26.0 // indirect
	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.26.0 // indirect
	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.2.0-alpha // indirect
	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.26.0 // indirect
	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.26.0 // indirect
	go.opentelemetry.io/otel/log v0.2.0-alpha // indirect
	go.opentelemetry.io/otel/sdk v1.26.0 // indirect
	go.opentelemetry.io/otel/sdk/log v0.2.0-alpha // indirect
	go.opentelemetry.io/otel/sdk/metric v1.26.0 // indirect
	go.opentelemetry.io/proto/otlp v1.2.0 // indirect

Output:

{"Timestamp":"0001-01-01T00:00:00Z","ObservedTimestamp":"2024-05-07T18:32:51.099086+03:00","Severity":21,"SeverityText":"FATAL",
"Body":{},"Attributes":[],"TraceID":"00000000000000000000000000000000","SpanID":"0000000000000000","TraceFlags":"00","Resource":[{"Key":"service.name",
"Value":{"Type":"STRING","Value":"unknown_service:___go_build_playground_git_otel"}},{"Key":"telemetry.sdk.language","Value":{"Type":"STRING","Value":"go"}},
{"Key":"telemetry.sdk.name","Value":{"Type":"STRING","Value":"opentelemetry"}},
{"Key":"telemetry.sdk.version","Value":{"Type":"STRING","Value":"1.26.0"}}],"Scope":{"Name":"test-stdout","Version":"","SchemaURL":""},"AttributeValueLengthLimit":0,"AttributeCountLimit":0}

Expected behavior

"Body":{}
should be:
"Body":{"This body will not show"}

[MrAlias]

cc @XSAM