Application Insight Ingestion API failed to track Exception when StackFrame do not have method information

[thinh-ng]

I'm encountering an issue where some specific exception does not tracked in Application Insight. I'm using SDK 2.21.0 with net6.0

Upon debugging, I see debug log did create the exception telemetry, and no warning/error be found, but the exception still not appear in Application Insight. I tried calling the ingestion with the telemetry data directly as follow:

POST https://southeastasia-1.in.applicationinsights.azure.com/v2/track

{
  ...
  "data": {
    ...
    "baseData": {
      ...
      "exceptions": [
        {
          ...
          "parsedStack": [
            {
              ...
              "level": 4,
              "assembly": "FastExpressionCompiler.LightExpression, Version=9.0.0.0, Culture=neutral, PublicKeyToken=null",
              "line": 0
            },
          ]
        }
      ]
    }
  }
}

Resulted in 400 response

{
    "itemsReceived": 1,
    "itemsAccepted": 0,
    "errors": [
        {
            "index": 0,
            "statusCode": 400,
            "message": "109: Field 'method' on type 'StackFrame' is required but missing or empty. Expected: string"
        }
    ]
}

I added "method": "n/a" in the request and the telemetry is tracked successfully. This is likely due to the method is being inlined, so the StackFrame cannot retrieve the method info

My question is:

• Is this a bug in API side?
• Is there a workaround that I can do to workaround this problem? There are a few exceptions that can't be track, and some of them I don't control the source code, so adding MethodImplOptions.NoInlining to the method is not always possible

If you need the full telemetry data I can provide it, I didn't post it here now as I'll have to redact some data from the telemetry