# Aspnetcore ## ASP.NET Core Attributes ASP.NET Core attributes | Attribute | Type | Description | Examples | Stability | |---|---|---|---|---| | `aspnetcore.diagnostics.exception.result` | string | ASP.NET Core exception middleware handling result | `handled`; `unhandled` |  | | `aspnetcore.diagnostics.handler.type` | string | Full type name of the [`IExceptionHandler`](https://learn.microsoft.com/dotnet/api/microsoft.aspnetcore.diagnostics.iexceptionhandler) implementation that handled the exception. | `Contoso.MyHandler` |  | | `aspnetcore.rate_limiting.policy` | string | Rate limiting policy name. | `fixed`; `sliding`; `token` |  | | `aspnetcore.rate_limiting.result` | string | Rate-limiting result, shows whether the lease was acquired or contains a rejection reason | `acquired`; `request_canceled` |  | | `aspnetcore.request.is_unhandled` | boolean | Flag indicating if request was handled by the application pipeline. | `true` |  | | `aspnetcore.routing.is_fallback` | boolean | A value that indicates whether the matched route is a fallback route. | `true` |  | | `aspnetcore.routing.match_status` | string | Match result - success or failure | `success`; `failure` |  | --- `aspnetcore.diagnostics.exception.result` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | |---|---|---| | `aborted` | Exception handling didn't run because the request was aborted. |  | | `handled` | Exception was handled by the exception handling middleware. |  | | `skipped` | Exception handling was skipped because the response had started. |  | | `unhandled` | Exception was not handled by the exception handling middleware. |  | --- `aspnetcore.rate_limiting.result` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | |---|---|---| | `acquired` | Lease was acquired |  | | `endpoint_limiter` | Lease request was rejected by the endpoint limiter |  | | `global_limiter` | Lease request was rejected by the global limiter |  | | `request_canceled` | Lease request was canceled |  | --- `aspnetcore.routing.match_status` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | |---|---|---| | `failure` | Match failed |  | | `success` | Match succeeded |  |