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