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I'm using the Azure.Monitor.OpenTelemetry.AspNetCore OTEL package to emit telemtry to Application Insights for an ASP.NET Core application (.NET 8).

Within Application Insights, I don't see the "Category" field that I would normally see for e.g. function apps. This field captures the category in ILogger<Category>, so I find it extremely useful for identifying the code that emitted the log.

How can I make the package also include the logging category?

Packages:

 <PackageReference Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.2.0" />
 <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="8.0.0" />

Code:

logger.LogInformation("Fetched all users");

Application Insights:

enter image description here

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4

This bug was fixed in Azure.Monitor.OpenTelemetry.Exporter v1.4.0-beta.1.

This is included in Azure.Monitor.OpenTelemetry.AspNetCore v1.3.0-beta.2, so upgrade the package reference (from v1.2.0) to:

<PackageReference Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.3.0-beta.2" />

1.4.0-beta.1 (2024-07-12)

Bugs Fixed

  • Added the LogRecord.CategoryName field to log and exception telemetry. Previously the CategoryName field was omitted, which was inconsistent with expected ILogger behavior, and with Application Insights classic behavior.
    (#44754)

https://github.com/Azure/azure-sdk-for-net/blob/cd4482ea1ef034f9c875e8c85bcff6704677dc08/sdk/monitor/Azure.Monitor.OpenTelemetry.Exporter/CHANGELOG.md?plain=1#L32

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