[bug] OTLP exporter ignores ExportProcessorType.Simple for logs and defaults to batch

[ysolomchenko]

Package

OpenTelemetry.Exporter.OpenTelemetryProtocol

Package Version

Package Name	Version
OpenTelemetry.Api	1.15.0
OpenTelemetry	1.15.0

Runtime Version

All

Description

When configuring logging with OpenTelemetry, setting OtlpExporterOptions.ExportProcessorType = ExportProcessorType.Simple is ignored. Instead, the exporter silently uses the batch processor.

This behavior is confusing because it appears that LogRecordExportProcessorOptions.ExportProcessorType overrides OtlpExporterOptions.ExportProcessorType even when the former is not explicitly configured.

Steps to Reproduce

Configure OpenTelemetry logging.

Set: options.ExportProcessorType = ExportProcessorType.Simple; on OtlpExporterOptions.

Run the application and observe the export behavior.

Expected Result

OtlpExporterOptions.ExportProcessorType should be respected unless LogRecordExportProcessorOptions is explicitly set.

Actual Result

The exporter uses batch processing regardless of OtlpExporterOptions.ExportProcessorType being set to Simple.

Additional Context

It appears that LogRecordExportProcessorOptions.ExportProcessorType implicitly overrides OtlpExporterOptions.ExportProcessorType, even when not explicitly configured by the user.

opentelemetry-dotnet/src/OpenTelemetry/Logs/Processor/LogRecordExportProcessorOptions.cs

Line 32 in 4fb41e8

public ExportProcessorType ExportProcessorType { get; set; } = ExportProcessorType.Batch;

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[ysolomchenko]

Just detected that BatchExportProcessorOptions also has this issue.