1.19.3

Changes

• remove assembly reference to System.Xml.Linq (#898)
• catch exceptions and add logging in MSBuild instrumentation (#873)
• change sampling priority of test framework spans (#911, #924)
• cache Agent response and discard default sampling rates (#902)
• flush buffer in BenchmarkDotNet exporter (#913)
• add benchmarks for ASP.NET Core (#879)
• use the mean span duration for benchmarks (#914)
• improve stability of benchmark results (#897)

Fixes

• fix System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. when making cross-AppDomain calls (#925)
• send DogStatsD metrics even when an Agent request fails (#899)

Performance Improvements

• optimize ASP.NET Core integration (#907)

Troubleshooting

• optional dump IL code modifications into the profiler log (#871)
• include value of DD_TRACE_NETSTANDARD_ENABLED in the profiler log (#928)

Build / Test

• add unit tests for AspNetCoreDiagnosticObserver #916
• build benchmark projects on every commit (#894)
• use Nano Server container image for benchmarks pipeline (#915)
• fix compiler warnings in benchmarks project (#917)
• use dedicated pool to run benchmarks (#931)
• prevent some projects from building at the same time (#883, #919)
• test improvements and reduced flakiness (#888, #921, #922, #923, #926)
• remove individual author names in NuGet packages (#900)
• remove temporary scheduled CI job (#905)
• remove GitVersion CI dependency (#910)
• remove usages of WebClient.IsBusy #918
• fix hanging integration tests (#930)

Changes since 1.19.2

1.19.2

Upgrade Notes

• This release fixes a known issue in .NET Tracer 1.18.0 - 1.19.1 that would cause .NET Framework 4.6+ applications hosted on IIS to crash with System.IO.FileNotFoundException: Could not load file or assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a (#876)
• If the provided Workaround was used, please use the provided Resolution to remove the workaround before upgrading

Changes

• Remove external assembly dependencies from the .NET Tracer:
  • Microsoft.CSharp 4.5.0 NuGet package (#761)
  • Newtonsoft.Json 12.0.1 NuGet package (#838)
  • System.Collections.NonGeneric 4.3.0 NuGet package (#839)
  • .NET Framework changes:
    • System.Diagnostics.DiagnosticSource 4.4.1 NuGet package (#881)
    • System.Net.Http 4.0.0.0 assembly reference (#880)
    • System.Runtime.InteropServices.RuntimeInformation 4.3.0 NuGet package (#761)

Fixes

• Fix System.IO.FileNotFoundException: Could not load file or assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. (PR: #880, Issue: #876)
• Fix System.InvalidProgramException: Common Language Runtime detected an invalid program (#875)
• Fix CallVirtual expected a StackExchange.Redis.RedisBase; found StackExchange.Redis.RedisBase (#872)
• Fix System.Runtime.Remoting.RemotingException: Object /<identifier1>/<identifier2>.rem has been disconnected or does not exist at the server. (#822, #855)
• Fix trace agent connection issues in Azure App Services environment (#852)
• Ensure ObjectExtensions.CallMethod can call the same target method with different expected return types (#863)
• Use the default WebRequest for the http:// prefix to send traces to the agent (PR: #860, Issue: #858)
• Reduce time spent performing DNS resolution when sending traces to the agent on localhost (#841, #864, #865)
• Fix templates for tracer log messages (#847)
• Fix error handling when sending traces to the agent (#850)
• Add netstandard feature flag to the diagnostic log (#866)

Performance Improvements

• Use a single cached buffer for trace serialization (#867)

Build / Test

• Improve reliability of testing CI pipelines (#878, #882, #884, #885, #886, #887)
• Add benchmarking CI pipeline with Benchmarks.Trace benchmark program (#842, #853, #859, #861, #862, #874, #877)
• Improve HttpClient and WebRequest test applications (#830)

Changes since 1.19.1

1.19.1

Fix

• read the sampling rates from Agent responses before disposing them (#846)

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)
  • This issue has been fixed in .NET Tracer 1.19.2

Changes since 1.19.0

1.19.0

Changes

• Remove external assembly dependency on MessagePack 1.9.3 (#806)
  • This fix resolves several instances of FileNotFoundException: Could not load file or assembly 'System.<Assembly_Name>' when running on .NET Framework
• DD_TRACE_ENABLED now disables manual instrumentation in addition to automatic instrumentation (#796)
• Rename the following configuration settings to follow the DD_TRACE_ prefix convention. Previous names will keep working (#816)
  • DD_TRACE_CONFIG_FILE
  • DD_TRACE_<INTEGRATION>_ENABLED
  • DD_TRACE_<INTEGRATION>_ANALYTICS_ENABLED
  • DD_TRACE_<INTEGRATION>_ANALYTICS_SAMPLE_RATE

Performance Improvements

• Optimize HttpMessageHandler integration code path (#808)
• Misc optimizations in the CLR Profiler (#831)

Fixes

• Add http.status_code tag for AspNet, AspNetMvc, AspNetWebApi2 integrations (#807, #814)
• Add missing instrumentation for ADO.NET calls made to netstandard.dll (#753, #834)
  • This feature is currently opt-in by setting the configuration variable DD_TRACE_NETSTANDARD_ENABLED
• Fix the return type for the IWireProtocol.Execute MongoDB integration (#810)
• Fix RNG from generating duplicate span ID's on .NET Framework (#795)
• Properly dispose HTTP connection when sending traces to the Agent (#840)
• Make the createLogPath.sh script executable, thanks @verdie-g! (#804)

Build / Test

• Standardize copyright information (#794)
• Make further reliability improvements to unit tests and integration tests (#791, #815, #826, #827, #828)

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)
  • This issue has been fixed in .NET Tracer 1.19.2

Changes since 1.18.3

1.18.4-prerelease

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)

1.18.3

New

• Add DD_TRACE_HEADER_TAGS environment variable to map incoming HTTP headers keys to tags (#790, #801)
  • Example: DD_TRACE_HEADER_TAGS=CASE-insensitive-Header:my-tag-name,User-ID:userId
  • The AspNet, AspNetWebApi2, AspNetCore, and Wcf integrations will apply the specified header values to tags on the root span
• Add DD_TRACE_STARTUP_LOGS to configure the tracer to write diagnostic logs at tracer startup (#799)

Fixes

• Fix incorrect null-check for ServiceVersion when sending metrics (#798)

Build / Test

• Add a catch block for ObjectDisposedException in test class MockTracerAgent (#805)

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)
  • This issue has been fixed in .NET Tracer 1.19.2

Changes since 1.18.2

1.18.2

New

• Add support for Datadog Synthetics distributed tracing HTTP header (#781)
• Add diagnostic logs at tracer startup for cross-language tracer consistency (#769, #776)

Fixes

• Improve logic in outbound HTTP automatic instrumentation to generate exactly one automatic instrumentation span (#780)
• Ensure IIS applications run the automatic instrumentation startup hook only once at application start (#775, #778)

Performance Overhead

• Reduce heap allocations in the following methods:
  • MethodBuilder, used throughout all integrations (#760)
  • ObjectExtensions, used throughout all integrations (#759)
  • SpanExtensions.AddTagsFromDbCommand, used in the AdoNet integration (#774)
  • UriHelpers.GetRelativeUrl, used in the AspNet, AspNetWebApi2, AspNetMvc, and AspNetCore integrations (#783)
  • AspNetCoreDiagnosticObserver, used in the AspNetCore integration (#779)
  • StringExtensions.ToBoolean (#789)
• Improve performance in Span.Finish (#763)

Build / Test

• Increase timeouts in smoke tests and read their output asynchronously (#788, #768)
• Improve reliability of RateLimiter unit tests (#787)

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)
  • This issue has been fixed in .NET Tracer 1.19.2

Changes since 1.18.0

1.18.1-prerelease

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)

1.18.0

New

• Expose sampling priority via Span.GetTag() (#739)
  • Now calling Span.GetTag("sampling.priority") returns the sampling priority for the enclosing Trace
• Add new CorrelationIdentifier APIs for manually correlating traces with logs (#742)
  • CorrelationIdentifier.Service
  • CorrelationIdentifier.Version
  • CorrelationIdentifier.Env

Fixes

• Restore missing spans from AdoNet, HttpMessageHandler, WebRequest and Wcf integrations on IIS (#750)

Performance Overhead

• Remove array allocation from NextUInt63 (#743)
• Remove locking in RateLimiter (#744)
• Remove the heap allocation from usage of the System.Diagnostics.Stopwatch class (#756)

Additional Improvements

• Add logging to automatic instrumentation startup code (#748)
• Add additional exception handling around error logging for the Datadog.Trace logs (#737), potential cancellation token exceptions (#731), and accessing environment variables (#747)
• Remove the use of exception filters (#733)
• Split CLR profiler constants into a separate header file (#734)

Build / Test

• Fix issue in the integration-tests pipeline that caused sample application tests to re-use the same NuGet package version (#751)
• Increase reliability of unit-tests pipeline (#741)
• Fix CI issue with .NET Core 3.1.300 SDK (#740)
• Update README for building Windows tracer home assets (#732)
• Improve standard output / standard error logging for integration test SmokeTest failures (#766)

Known Issues and Workarounds

• Application fails to start with System.IO.FileNotFoundException System.Net.Http 4.0.0.0 (#876)
  • This issue has been fixed in .NET Tracer 1.19.2

Changes since 1.17.0

1.17.1-prerelease

v1.17.1-prerelease

Update Tracer version to v1.17.1-prerelease (#764)