Why AddOpentelemetry enables Microsoft logging?

[dariogriffo]

What is the question?

The following setup produces 2 log entries in my OTEL collector using ILogger<>
I want to use serilog as my logging provider because of the rich features it provides. But doing so and enabling OTEL seems like Microsoft logging also is enabled.
I would expect to have an option to disable dotnet built-in logging to send logs to OTEL if the provider is not set.
Am I correct?

Additional context

No response

[CodeBlanch]

@dariogriffo

Does it work if you do this?

var logger = new LoggerConfiguration().WriteTo.OpenTelemetry().CreateLogger();

builder.Services
	.AddOpenTelemetry().UseOtlpExporter()
	.AddLogging(c => c
		.ClearProviders() // Clear built-in ILoggerProviders and the OpenTelemetry one added by UseOtlpExporter
		.AddSerilog(logger));

May be a bit easier to read this way:

var logger = new LoggerConfiguration().WriteTo.OpenTelemetry().CreateLogger();

builder.Services
	.AddOpenTelemetry().UseOtlpExporter();

builder.Logging
	.ClearProviders() // Clear built-in ILoggerProviders and the OpenTelemetry one added by UseOtlpExporter
	.AddSerilog(logger);