aspnetcore/sample/ApplicationInsightsHostingStartupSample/appsettings.json

{
  "ApplicationInsights": {
    "InstrumentationKey": "11111111-2222-3333-4444-555555555555"
  },
  "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  }
}