OpenTelemetry and Instrumentation.AspNetCore backward .NET framework compatibility

[pellesantiago]

Feature Request

Maintain OpenTelemetry project compatibility with old and most used .net frameworks, like net 4.6.2 and core 3.1 and net standard 2.0

Is your feature request related to a problem?

I'm using several packages from this repository.
I cannot update all the other packages version to the latest version (1,.4.0-alpha-2), because this project is forcing me to stay on 1,.4.0-alpha-1. Due to 1.0.0-rc9.5 is the latest version supporting net 4.6.2, core 3.1 and net standard 2.0, and it forces me to stay on 1,.4.0-alpha-1.

After updating OpenTelemetry to 1.4.0-alpha-2, new errors appeared for net 5 projects.
System.Diagnostics.DiagnosticSource doesn't support net5.0. Consider updating your TargetFramework to net6.0 or later. %USERPROFILE%.nuget\packages\system.diagnostics.diagnosticsource\7.0.0-preview.7.22375.6\buildTransitive\netcoreapp2.0\System.Diagnostics.DiagnosticSource.targets

I consider that net 5 should be on the stack for a few extra months. It ended the End of Support just this year, on May 2022.

[cijothomas]

I consider that net 5 should be on the stack for a few extra months. It ended the End of Support just this year, on May 2022.

We are indeed considering dropping support for netstandard2.0, but a final decision is not yet made.
#3701 ans #3703

.NET5 and anything else that is end-of-support from .NET is not something we can support.

[pellesantiago]

• Net 5 => End of support reached, we all should move on to .Net 6.

• Net framework 4.6.2 => Is still supported by Microsoft and it is distributed with Windows.

• NetStandard 2.1 => Does not support any Net framework +4.6.1 currently. Probably you should stay on 2.0 for now.

  https://dotnet.microsoft.com/en-us/platform/dotnet-standard