Application Insights– Configure Log Level

I had configured my ASP.NET Core application to use Application Insights for logging. However when I took a look at the logged messages inside Application Insights, nothing was logged? What did I do wrong?

The only code I added to enable logging was this:

	var builder = WebApplication.CreateBuilder(args);
	builder.Services.AddApplicationInsightsTelemetry();

view raw Program.cs hosted with ❤ by GitHub

But I couldn’t see what could be wrong in this one line…

I searched through the documentation to find a solution. There I noticed the following sentence:

By default, ASP.NET Core applications have an Application Insights logging provider registered when they're configured through the code or codeless approach. The registered provider is configured to automatically capture log events with a severity of LogLevel.Warning or greater.

Aha! By default the ApplicationInsightsLoggerProvider will only log messages with LogLevel Warning or higher.

Let’s change this to also log Informational messages.

There are 2 ways to do this;

• Through configuration
• Through code

Change LogLevel through configuration

To change the log level through configuration, we need to update our appsettings.json and add an ApplicationInsights section inside our Logging configuration section:

	{
	"Logging": {
	"LogLevel": {
	"Default": "Warning"
	},
	"ApplicationInsights": {
	"LogLevel": {
	"Default": "Information"
	"Microsoft": "Warning"
	}
	}
	}
	}

view raw appsettings.json hosted with ❤ by GitHub

Change LogLevel through code

A second option is to change the log level through code. This can be done through the AddFilter<> method:

	builder.Logging.AddFilter<ApplicationInsightsLoggerProvider>("", LogLevel.Information)
	builder.Logging.AddFilter<ApplicationInsightsLoggerProvider>("Microsoft", LogLevel.Warning)

view raw AddFilter.cs hosted with ❤ by GitHub