I’m trying to control the log level for my C# Azure Function. The goal is to change the log level without having to redeploy the function. The idea is to change the Environment variables in order to achieve this.

I added an environment variable to control the log level:
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It doesn’t seem to work, as I’m still seeing Debug and Information logging:
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My host.json looks like this:

{
    "version": "2.0",
    "logging": {
      "applicationInsights": {
        "samplingSettings": {
          "isEnabled": true,
          "excludedTypes": "Request"
        },
        "enableLiveMetricsFilters": true
      },
      "logLevel": {
        "default": "Debug"
      }
    }
}

And Program.cs like this:

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureLogging(builder => builder.SetMinimumLevel(LogLevel.Debug))
    .ConfigureServices(services =>
    {
        services.AddApplicationInsightsTelemetryWorkerService();
        services.ConfigureFunctionsApplicationInsights();
        services.Configure<LoggerFilterOptions>(options => options.Rules.Clear());      
    })
    .Build();

host.Run();

When i run my function app locally it works as intended when i change my local.settings.json:

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated",
    "AzureFunctionsJobHost__logging__LogLevel__default": "Warning"
  }
}

Can someone shed some light on what i’m missing? Thanks in advance.