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Changelog

Unreleased

1.14.0

Released 2025-Nov-13

  • Update .NET 10.0 NuGet package versions from 10.0.0-rc.2.25502.107 to 10.0.0. (#3403)

  • Updated OpenTelemetry core component version(s) to 1.14.0. (#3403)

1.14.0-rc.1

Released 2025-Nov-05

  • Add support for .NET 10.0. (#2822)

1.13.0

Released 2025-Oct-22

  • Added support for listening to ASP.NET Core Blazor activities. Configurable with the AspNetCoreTraceInstrumentationOptions.EnableRazorComponentsSupport option which defaults to true. Only applies to .NET 10.0 or greater. (#3012)

  • Following metrics will now be enabled by default when targeting .NET10.0 or newer framework:

    • Meter : Microsoft.AspNetCore.MemoryPool
      • aspnetcore.memory_pool.pooled
      • aspnetcore.memory_pool.evicted
      • aspnetcore.memory_pool.allocated
      • aspnetcore.memory_pool.rented
    • Meter : Microsoft.AspNetCore.Authentication
      • aspnetcore.authentication.authenticate.duration
      • aspnetcore.authentication.challenges
      • aspnetcore.authentication.forbids
      • aspnetcore.authentication.sign_ins
      • aspnetcore.authentication.sign_outs
    • Meter : Microsoft.AspNetCore.Authorization
      • aspnetcore.authorization.attempts
    • Meter : Microsoft.AspNetCore.Identity
      • aspnetcore.identity.user.create.duration
      • aspnetcore.identity.user.update.duration
      • aspnetcore.identity.user.delete.duration
      • aspnetcore.identity.user.check_password_attempts
      • aspnetcore.identity.user.generated_tokens
      • aspnetcore.identity.user.verify_token_attempts
      • aspnetcore.identity.sign_in.authenticate.duration
      • aspnetcore.identity.sign_in.check_password_attempts
      • aspnetcore.identity.sign_in.sign_ins
      • aspnetcore.identity.sign_in.sign_outs
      • aspnetcore.identity.sign_in.two_factor_clients_remembered
      • aspnetcore.identity.sign_in.two_factor_clients_forgotten
    • Meter : Microsoft.AspNetCore.Components
      • aspnetcore.components.navigate
      • aspnetcore.components.handle_event.duration
    • Meter : Microsoft.AspNetCore.Components.Lifecycle
      • aspnetcore.components.update_parameters.duration
      • aspnetcore.components.render_diff.duration
      • aspnetcore.components.render_diff.size
    • Meter : Microsoft.AspNetCore.Components.Server.Circuits
      • aspnetcore.components.circuit.active
      • aspnetcore.components.circuit.connected
      • aspnetcore.components.circuit.duration

    For details about each individual metric check ASP.NET Core docs page. (#3012)

  • Updated OpenTelemetry core component version(s) to 1.13.1. (#3218)

1.12.0

Released 2025-May-05

  • Updated OpenTelemetry core component version(s) to 1.12.0. (#2725)

1.11.1

Released 2025-Mar-05

  • Added support for listening to ASP.NET Core SignalR activities. Configurable with the AspNetCoreTraceInstrumentationOptions.EnableAspNetCoreSignalRSupport option which defaults to true. Only applies to .NET 9.0 or greater. (#2539)

  • Updated OpenTelemetry core component version(s) to 1.11.2. (#2582)

1.11.0

Released 2025-Jan-27

  • The http.server.request.duration histogram (measured in seconds) produced by the metrics instrumentation in this package now uses the Advice API to set default explicit buckets following the OpenTelemetry Specification. (#2430)

  • Updated OpenTelemetry core component version(s) to 1.11.1. (#2477)

1.10.1

Released 2024-Dec-10

  • Metric support for the .NET Standard target was removed by mistake in 1.10.0. This functionality has been restored. (#2403)

1.10.0

Released 2024-Dec-09

  • Drop support for .NET 6 as this target is no longer supported. (#2138)

  • Updated OpenTelemetry core component version(s) to 1.10.0. (#2317)

1.9.0

Released 2024-Jun-17

  • Updated OpenTelemetry core component version(s) to 1.9.0. (#1888)

1.8.1

Released 2024-Apr-12

  • Breaking Change: Fixed tracing instrumentation so that by default any values detected in the query string component of requests are replaced with the text Redacted when building the url.query tag. For example, ?key1=value1&key2=value2 becomes ?key1=Redacted&key2=Redacted. You can disable this redaction by setting the environment variable OTEL_DOTNET_EXPERIMENTAL_ASPNETCORE_DISABLE_URL_QUERY_REDACTION to true. (#5532)

1.8.0

Released 2024-Apr-04

  • Fixed an issue for spans when server.port attribute was not set with server.address when it has default values (80 for HTTP and 443 for HTTPS protocol). (#5419)

  • Fixed an issue where the http.request.method_original attribute was not set on activity. Now, when http.request.method is set and the original method is converted to its canonical form (e.g., Get is converted to GET), the original value Get will be stored in http.request.method_original. (#5471)

  • Fixed the name of spans that have http.request.method attribute set to _OTHER. The span name will be set as HTTP {http.route} as per the specification. (#5484)

1.7.1

Released 2024-Feb-09

  • Fixed issue #4466 where the activity instance returned by Activity.Current was different than instance obtained from IHttpActivityFeature.Activity. (#5136)

  • Fixed an issue where the http.route attribute was not set on either the Activity or http.server.request.duration metric generated from a request when an exception handling middleware is invoked. One caveat is that this fix does not address the problem for the http.server.request.duration metric when running ASP.NET Core 8. ASP.NET Core 8 contains an equivalent fix which should ship in version 8.0.2 (see: dotnet/aspnetcore#52652). (#5135)

  • Fixes scenario when the net6.0 target of this library is loaded into a .NET 7+ process and the instrumentation does not behave as expected. This is an unusual scenario that does not affect users consuming this package normally. This fix is primarily to support the opentelemetry-dotnet-instrumentation project. (#5252)

1.7.0

Released 2023-Dec-13

1.6.0 - First stable release of this library

Released 2023-Dec-13

  • Re-introduced support for gRPC instrumentation as an opt-in experimental feature. From now onwards, gRPC can be enabled by setting OTEL_DOTNET_EXPERIMENTAL_ASPNETCORE_ENABLE_GRPC_INSTRUMENTATION flag to True. OTEL_DOTNET_EXPERIMENTAL_ASPNETCORE_ENABLE_GRPC_INSTRUMENTATION can be set as an environment variable or via IConfiguration. The change is introduced in order to support stable release of http instrumentation. Semantic conventions for RPC is still experimental and hence the package will only support it as an opt-in experimental feature. Note that the support was removed in 1.6.0-rc.1 version of the package and versions released before 1.6.0-rc.1 had gRPC instrumentation enabled by default. (#5130)

1.6.0-rc.1

Released 2023-Dec-01

  • Removed support for OTEL_SEMCONV_STABILITY_OPT_IN environment variable. The library will now emit only the stable semantic conventions. (#5066)

  • Removed netstandard2.1 target. (#5094)

  • Removed support for grpc instrumentation to unblock stable release of http instrumentation. For details, see issue #5098 (#5097)

  • Breaking Change : Renamed AspNetCoreInstrumentationOptions to AspNetCoreTraceInstrumentationOptions. (#5108)

1.6.0-beta.3

Released 2023-Nov-17

  • Removed the Activity Status Description that was being set during exceptions. Activity Status will continue to be reported as Error. This is a breaking change. EnrichWithException can be leveraged to restore this behavior. (#5025)

  • Updated http.request.method to match specification guidelines.

    • For activity, if the method does not belong to one of the known values then the request method will be set on an additional tag http.request.method.original and http.request.method will be set to _OTHER.
    • For metrics, if the original method does not belong to one of the known values then http.request.method on http.server.request.duration metric will be set to _OTHER

    http.request.method is set on http.server.request.duration metric or activity when OTEL_SEMCONV_STABILITY_OPT_IN environment variable is set to http or http/dup. (#5001)

  • An additional attribute error.type will be added to activity and http.server.request.duration metric when the request results in unhandled exception. The attribute value will be set to full name of exception type.

    The attribute will only be added when OTEL_SEMCONV_STABILITY_OPT_IN environment variable is set to http or http/dup. (#4986)

  • Fixed network.protocol.version attribute values to match the specification. (#5007)

  • Calls to /metrics will now be included in the http.server.request.duration metric. This change may affect Prometheus pull scenario if the Prometheus server sends request to the scraping endpoint that contains /metrics in path. (#5044)

  • Fixes the http.route attribute for scenarios in which it was previously missing or incorrect. Additionally, the http.route attribute is now the same for both the metric and Activity emitted for a request. Lastly, the Activity.DisplayName has been adjusted to have the format {http.request.method} {http.route} to conform with the specification. There remain scenarios when using conventional routing or Razor pages where http.route is still incorrect. See #5056 and #5057 for more details. (#5026)

  • Removed network.protocol.name from http.server.request.duration metric as per spec. (#5049)

1.6.0-beta.2

Released 2023-Oct-26

  • Introduced a new metric, http.server.request.duration measured in seconds. The OTel SDK (starting with version 1.6.0) applies custom histogram buckets for this metric to comply with the Semantic Convention for Http Metrics. This new metric is only available for users who opt-in to the new semantic convention by configuring the OTEL_SEMCONV_STABILITY_OPT_IN environment variable to either http (to emit only the new metric) or http/dup (to emit both the new and old metrics). (#4802)

    • New metric: http.server.request.duration
      • Unit: s (seconds)
      • Histogram Buckets: 0, 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10
    • Old metric: http.server.duration
      • Unit: ms (milliseconds)
      • Histogram Buckets: 0, 5, 10, 25, 50, 75, 100, 250, 500, 750, 1000, 2500, 5000, 7500, 10000

    Note: the older http.server.duration metric and OTEL_SEMCONV_STABILITY_OPT_IN environment variable will eventually be removed after the HTTP semantic conventions are marked stable. At which time this instrumentation can publish a stable release. Refer to the specification for more information regarding the new HTTP semantic conventions for both spans and metrics.

  • Following metrics will now be enabled by default when targeting .NET8.0 or newer framework:

    • Meter : Microsoft.AspNetCore.Hosting

      • http.server.request.duration
      • http.server.active_requests

    • Meter : Microsoft.AspNetCore.Server.Kestrel

      • kestrel.active_connections
      • kestrel.connection.duration
      • kestrel.rejected_connections
      • kestrel.queued_connections
      • kestrel.queued_requests
      • kestrel.upgraded_connections
      • kestrel.tls_handshake.duration
      • kestrel.active_tls_handshakes

    • Meter : Microsoft.AspNetCore.Http.Connections

      • signalr.server.connection.duration
      • signalr.server.active_connections

    • Meter : Microsoft.AspNetCore.Routing

      • aspnetcore.routing.match_attempts

    • Meter : Microsoft.AspNetCore.Diagnostics

      • aspnetcore.diagnostics.exceptions

    • Meter : Microsoft.AspNetCore.RateLimiting

      • aspnetcore.rate_limiting.active_request_leases
      • aspnetcore.rate_limiting.request_lease.duration
      • aspnetcore.rate_limiting.queued_requests
      • aspnetcore.rate_limiting.request.time_in_queue
      • aspnetcore.rate_limiting.requests

    For details about each individual metric check ASP.NET Core docs page.

    NOTES:

    • When targeting .NET8.0 framework or newer, http.server.request.duration metric will only follow v1.22.0 semantic conventions specification. Ability to switch behavior to older conventions using OTEL_SEMCONV_STABILITY_OPT_IN environment variable is not available.
    • Users can opt-out of metrics that are not required using views.

    (#4934)

  • Added network.protocol.name dimension to http.server.request.duration metric. This change only affects users setting OTEL_SEMCONV_STABILITY_OPT_IN to http or http/dup. (#4934)

  • Breaking: Removed Enrich and Filter support for metrics instrumentation. With this change, AspNetCoreMetricsInstrumentationOptions is no longer available. (#4981)

    • Enrich migration:

      An enrichment API for the http.server.request.duration metric is available inside AspNetCore for users targeting .NET 8.0 (or newer). For details see: Enrich the ASP.NET Core request metric.

    • Filter migration:

      There is no comparable filter mechanism currently available for any .NET version. Please share your feedback if you are impacted by this feature gap.

      Note The View API may be used to drop dimensions.

  • Updated description for http.server.request.duration metrics to match spec definition. (#4990)

1.5.1-beta.1

Released 2023-Jul-20

  • The new HTTP and network semantic conventions can be opted in to by setting the OTEL_SEMCONV_STABILITY_OPT_IN environment variable. This allows for a transition period for users to experiment with the new semantic conventions and adapt as necessary. The environment variable supports the following values:

    • http - emit the new, frozen (proposed for stable) HTTP and networking attributes, and stop emitting the old experimental HTTP and networking attributes that the instrumentation emitted previously.
    • http/dup - emit both the old and the frozen (proposed for stable) HTTP and networking attributes, allowing for a more seamless transition.
    • The default behavior (in the absence of one of these values) is to continue emitting the same HTTP and network semantic conventions that were emitted in 1.5.0-beta.1.
    • Note: this option will eventually be removed after the new HTTP and network semantic conventions are marked stable. At which time this instrumentation can receive a stable release, and the old HTTP and network semantic conventions will no longer be supported. Refer to the specification for more information regarding the new HTTP and network semantic conventions for both spans and metrics. (#4537, #4606, #4660)

  • Fixed an issue affecting NET 7.0+. If custom propagation is being used and tags are added to an Activity during sampling then that Activity would be dropped. (#4637)

1.5.0-beta.1

Released 2023-Jun-05

  • Bumped the package version to 1.5.0-beta.1 to keep its major and minor version in sync with that of the core packages. This would make it more intuitive for users to figure out what version of core packages would work with a given version of this package. The pre-release identifier has also been changed from rc to beta as we believe this more accurately reflects the status of this package. We believe the rc identifier will be more appropriate as semantic conventions reach stability.

  • Fix issue where baggage gets cleared when the ASP.NET Core Activity is stopped. The instrumentation no longer clears baggage. One problem this caused was that it prevented Activity processors from accessing baggage during their OnEnd call. (#4274)

  • Added direct reference to System.Text.Encodings.Web with minimum version of 4.7.2 due to CVE-2021-26701. This impacts target frameworks netstandard2.0 and netstandard2.1 which has a reference to Microsoft.AspNetCore.Http.Abstractions that depends on System.Text.Encodings.Web >= 4.5.0. (#4399)

  • Improve perf by avoiding boxing of common status codes values. (#4360, #4363)

1.0.0-rc9.14

Released 2023-Feb-24

  • Updated OTel SDK dependency to 1.4.0

1.4.0-rc9.13

Released 2023-Feb-10

1.0.0-rc9.12

Released 2023-Feb-01

1.0.0-rc9.11

Released 2023-Jan-09

1.0.0-rc9.10

Released 2022-Dec-12

  • Users migrating from version 1.0.0-rc9.9 will see the following breaking changes:

    • Updated http.status_code dimension type from string to int for http.server.duration metric. (#3930)

    • http.host will no longer be populated on http.server.duration metric. net.host.name and net.host.port attributes will be populated instead. (#3928)

    • The http.server.duration metric's http.target attribute is replaced with http.route attribute. (#3903)

    • http.host will no longer be populated on activity. net.host.name and net.host.port attributes will be populated instead. (#3858)

  • Extension method AddAspNetCoreInstrumentation on MeterProviderBuilder now supports AspNetCoreMetricsInstrumentationOptions. This option class exposes configuration properties for metric filtering and tag enrichment. (#3948, #3982)

1.0.0-rc9.9

Released 2022-Nov-07

  • Breaking change The Enrich callback option has been removed. For better usability, it has been replaced by three separate options: EnrichWithHttpRequest, EnrichWithHttpResponse and EnrichWithException. Previously, the single Enrich callback required the consumer to detect which event triggered the callback to be invoked (e.g., request start, response end, or an exception) and then cast the object received to the appropriate type: HttpRequest, HttpResponse, or Exception. The separate callbacks make it clear what event triggers them and there is no longer the need to cast the argument to the expected type. (#3749)

  • Added back netstandard2.0 and netstandard2.1 targets. (#3755)

1.0.0-rc9.8

Released 2022-Oct-17

1.0.0-rc9.7

Released 2022-Sep-29

  • Performance improvement (Reduced memory allocation) - Updated DiagnosticSource event subscription to specific set of events. (#3519)

  • Added overloads which accept a name to the TracerProviderBuilder AddAspNetCoreInstrumentation extension to allow for more fine-grained options management (#3661)

  • Fix issue where when an application has an ExceptionFilter, the exception data wouldn't be collected. (#3475)

1.0.0-rc9.6

Released 2022-Aug-18

  • Removed netstandard2.0 and netstandard2.1 targets. .NET 5 reached EOL in May 2022 and .NET Core 3.1 reaches EOL in December 2022. End of support dates for .NET are published here. The instrumentation for ASP.NET Core now requires .NET 6 or later. (#3567)

  • Fixed an issue where activity started within middleware was modified by instrumentation library. (#3498)

  • Updated to use Activity native support from System.Diagnostics.DiagnosticSource to set activity status. (#3118) (#3555)

1.0.0-rc9.5

Released 2022-Aug-02

  • Fix Remote IP Address - NULL reference exception. (#3481)

  • Metrics instrumentation to correctly populate http.flavor tag. (1.1 instead of HTTP/1.1 etc.) (#3379)

  • Tracing instrumentation to populate http.flavor tag. (#3372)

  • Tracing instrumentation to populate http.scheme tag. (#3392)

1.0.0-rc9.4

Released 2022-Jun-03

  • Added additional metric dimensions. (#3247)

  • Removes net5.0 target as .NET 5.0 is going out of support. The package keeps netstandard2.1 target, so it can still be used with .NET5.0 apps. (#3147)

1.0.0-rc9.3

Released 2022-Apr-15

1.0.0-rc9.2

Released 2022-Apr-12

1.0.0-rc9.1

Released 2022-Mar-30

  • Fix: Http server span status is now unset for 400-499. (#2904)

  • Fix: drop direct reference of the Microsoft.AspNetCore.Http.Features from net5 & net6 targets (already part of the FrameworkReference since the net5). (#2860)

  • Reduce allocations calculating the http.url tag. (#2947)

1.0.0-rc10 (broken. use 1.0.0-rc9.1 and newer)

Released 2022-Mar-04

1.0.0-rc9

Released 2022-Feb-02

1.0.0-rc8

Released 2021-Oct-08

  • Replaced http.path tag on activity with http.target. (#2266)

1.0.0-rc7

Released 2021-Jul-12

1.0.0-rc6

Released 2021-Jun-25

1.0.0-rc5

Released 2021-Jun-09

  • Fixes bug #1740: Instrumentation.AspNetCore for gRPC services omits ALL rpc.* attributes under certain conditions (#1879)

1.0.0-rc4

Released 2021-Apr-23

  • When using OpenTelemetry.Extensions.Hosting you can now bind AspNetCoreInstrumentationOptions from DI. (#1997)

1.0.0-rc3

Released 2021-Mar-19

  • Leverages added AddLegacySource API from OpenTelemetry SDK to trigger Samplers and ActivityProcessors. Samplers, ActivityProcessor.OnStart will now get the Activity before any enrichment done by the instrumentation. (#1836)

  • Performance optimization by leveraging sampling decision and short circuiting activity enrichment. Filter and Enrich are now only called if activity.IsAllDataRequested is true (#1899)

1.0.0-rc2

Released 2021-Jan-29

1.0.0-rc1.1

Released 2020-Nov-17

  • AspNetCoreInstrumentation sets ActivitySource to activities created outside ActivitySource. (#1515)

  • For gRPC invocations, leading forward slash is trimmed from span name in order to conform to the specification. (#1551)

0.8.0-beta.1

Released 2020-Nov-5

  • Record Exception in AspNetCore instrumentation based on RecordException in AspNetCoreInstrumentationOptions (#1408)

  • Added configuration option EnableGrpcAspNetCoreSupport to enable or disable support for adding OpenTelemetry RPC attributes when using Grpc.AspNetCore. This option is enabled by default. (#1423)

  • Renamed TextMapPropagator to TraceContextPropagator, CompositePropagator to CompositeTextMapPropagator. IPropagator is renamed to TextMapPropagator and changed from interface to abstract class. (#1427)

  • Propagators.DefaultTextMapPropagator will be used as the default Propagator (#1427)

  • Removed Propagator from Instrumentation Options. Instrumentation now always respect the Propagator.DefaultTextMapPropagator. (#1448)

0.7.0-beta.1

Released 2020-Oct-16

  • Instrumentation no longer store raw objects like HttpRequest in Activity.CustomProperty. To enrich activity, use the Enrich action on the instrumentation. (#1261)

  • Span Status is populated as per new spec (#1313)

0.6.0-beta.1

Released 2020-Sep-15

  • For gRPC invocations, the grpc.method and grpc.status_code attributes added by the library are removed from the span. The information from these attributes is contained in other attributes that follow the conventions of OpenTelemetry. (#1260)

0.5.0-beta.2

Released 2020-08-28

  • Added Filter public API on AspNetCoreInstrumentationOptions to allow filtering of instrumentation based on HttpContext.

  • Asp.Net Core Instrumentation automatically populates HttpRequest, HttpResponse in Activity custom property

  • Changed the default propagation to support W3C Baggage (#1048)

    • The default ITextFormat is now CompositePropagator(TraceContextFormat, BaggageFormat). Baggage sent via the W3C Baggage header will now be parsed and set on incoming Http spans.

  • Introduced support for Grpc.AspNetCore (#803).

    • Attributes are added to gRPC invocations: rpc.system, rpc.service, rpc.method. These attributes are added to an existing span generated by the instrumentation. This is unlike the instrumentation for client-side gRPC calls where one span is created for the gRPC call and a separate span is created for the underlying HTTP call in the event both gRPC and HTTP instrumentation are enabled.

  • Renamed ITextPropagator to IPropagator (#1190)

0.4.0-beta.2

Released 2020-07-24

  • First beta release

0.3.0-beta

Released 2020-07-23

  • Initial release