[Logs Bridge API] Add support for Body set directly on LogRecord for OTLP Exporter.

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+* **Experimental (pre-release builds only):** Added
+ support for `Body` set directly on `LogRecord` via the Logs Bridge API.
+ [#5268](https:/open-telemetry/opentelemetry-dotnet/pull/5268)
+
 * **Experimental (pre-release builds only):** Added
  `LoggerProviderBuilder.AddOtlpExporter` registration extensions.
  [#5103](https:/open-telemetry/opentelemetry-dotnet/pull/5103)

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/OtlpLogRecordTransformer.cs

@@ -170,6 +170,14 @@ internal OtlpLogs.LogRecord ToOtlpLog(LogRecord logRecord)
  AddAttribute(otlpLogRecord, result, attributeCountLimit);
  }
  }
+
+ // Supports Body set directly on LogRecord for the Logs Bridge API.
+ if (otlpLogRecord.Body == null && logRecord.Body != null)
+ {
+ // If {OriginalFormat} is not present in the attributes,
+ // use logRecord.Body if it is set.
+ otlpLogRecord.Body = new OtlpCommon.AnyValue { StringValue = logRecord.Body };
+ }
  }
 
  if (logRecord.TraceId != default && logRecord.SpanId != default)

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/OtlpLogExporterTests.cs

@@ -589,6 +589,38 @@ public void CheckToOtlpLogRecordBodyIsPopulated(bool includeFormattedMessage)
  Assert.Equal("state", otlpLogRecord.Body.StringValue);
  }
 
+ [Fact]
+ public void LogRecordBodyIsExportedWhenUsingBridgeApi()
+ {
+ var logRecords = new List<LogRecord>();
+
+ using (var loggerProvider = Sdk.CreateLoggerProviderBuilder()
+ .ConfigureServices(services =>
+ {
+ services.AddLogging(builder => builder.AddOpenTelemetry(options =>
+ {
+ options.AddInMemoryExporter(logRecords);
+ }));
+ })
+ .Build())
+ {
+ var logger = loggerProvider.GetLogger();
+
+ logger.EmitLog(new LogRecordData()
+ {
+ Body = "Hello world",
+ });
+ }
+
+ Assert.Single(logRecords);
+
+ var otlpLogRecordTransformer = new OtlpLogRecordTransformer(DefaultSdkLimitOptions, new());
+
+ var otlpLogRecord = otlpLogRecordTransformer.ToOtlpLog(logRecords[0]);
+
+ Assert.Equal("Hello world", otlpLogRecord.Body?.StringValue);
+ }
+
  [Fact]
  public void CheckToOtlpLogRecordExceptionAttributes()
  {