Creating a route based tracing sampler in ASP.NET Core

[seansaleh]

I found the examples for Stratified sampling and would love to do this based on the ASP.NET Core route (or any info from that route, like the URL).

When I try it, it seems like the sampling logic is run before any information is propagated into the SamplingParameters
The value of samplingParameters.Name is always just Microsoft.AspNetCore.Hosting.HttpRequestIn and the samplingParameters.Tags is null. And from testing the sampler is called before Filter or EnrichWithHttpRequest

Has anyone else ever gotten this working?

[seansaleh]

Edit: The below only applies to Asp.Net, not Asp.Net Core (As per comment below)
It looks like support was literally just added for this in the upcoming version: open-telemetry/opentelemetry-dotnet-contrib#3151

[cijothomas]

^ This is only for Asp.NET, and not Asp.Net Core, unfortunately. For Asp.Net Core there is a similar tracking issue in the asp.net repo itself.

[seansaleh]

Thanks! I missed that :/
Do you know any details on that issue in Asp.Net Core? All I've found was this closed issue on opentelemetry indicating it should be done but is a problem in Asp.Net Core: open-telemetry/opentelemetry-dotnet-contrib#2554

[cijothomas]

I was not able to find the tracking issue either... @rajkumar-rangaraj Do you know if there is an issue in asp.net core side to track this?