MassTransit–Change log level

A short post today; a colleague wanted to investigate a production issue when sending and receiving messages using MassTransit. He couldn’t find immediately how to change to capture more details about the MassTransit internals.

I had a look together with him. So for further reference you can find the answer here.

Using Serilog

On this specific project he was using Serilog so let me first show you how to change the log level for MassTransit when using Serilog:

	using Serilog;
	Log.Logger = new LoggerConfiguration()
	.MinimumLevel.Information()
	//Override default log level
	.MinimumLevel.Override("MassTransit", LogEventLevel.Debug)
	.WriteTo.Console()
	.CreateLogger();
	try
	{
	Log.Information("Starting web application");
	var builder = WebApplication.CreateBuilder(args);
	builder.Services.AddSerilog();
	var app = builder.Build();
	//Removed the other code
	app.Run();
	}
	catch (Exception ex)
	{
	Log.Fatal(ex, "Application terminated unexpectedly");
	}
	finally
	{
	Log.CloseAndFlush();
	}

view raw Program.cs hosted with ❤ by GitHub

Using Microsoft.Extensions.Logging

And here is the code changes required when using the default Microsoft.Extensions.Logging:

	var builder = WebApplication.CreateBuilder(args);
	builder.Logging
	.SetMinimumLevel(LogLevel.Information)
	.AddConsole()
	// Override the default log level for MassTransit
	.AddFilter("MassTransit", LogLevel.Debug);
	var app = builder.Build();
	try
	{
	app.Logger.LogInformation("Starting web application");
	//Removed the other code
	app.Run();
	}
	catch (Exception ex)
	{
	app.Logger.LogError(ex, "Application terminated unexpectedly");
	}
	finally
	{
	}

view raw Program.cs hosted with ❤ by GitHub

Remark: I would certainly recommend to have a look at the observability features of MassTransit as well and look to implement OpenTelemetry in your application.

More information

Logging · MassTransit

Observability · MassTransit