Add netstandard2.1 target and update DiagnosticSource dependency
#2679
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I updated to the .NET 9 SDK and that I suspect is triggering the new formatting warnings, but I'm not entirely sure why. Will work on resolving those. |
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Working on the test failures. The IIS ones suggest we might still have to ship an older DiagnosticsSource build too, although I need to investigate why exactly based on our packaging process. |
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JeremyBessonElastic
approved these changes
Oct 21, 2025
test/startuphook/Elastic.Apm.StartupHook.Tests/Elastic.Apm.StartupHook.Tests.csproj
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Fixes #2657
Fixes #2445
This adds a
netstandard2.1target so that features such as OTel bridge are available on older runtimes, even though those are out of support. This prevents an update of our package, without a runtime update, breaking/removing features. Features may still not be 100% compatible with older unsupported runtimes, but should work in general.As part of this, I updated the minimum dependency for
System.Diagnostics.DiagnosticSourcewhich is no generally 8.0.0. We still ship a version ofElastic.Apmand loader for the Startup hooks zip file which are built against 6.0.0. These support older unsupported runtimes although with no official testing.NOTE: We DOT NOT update
System.Diagnostics.DiagnosticSourceonnet462andnet472. While this worked and tested fine in local dev, it fails the IIS tests in CI. For now, we leave the version in these targets unchanged from 5.0.0. This is likely fine as we do not depend on any newer APIs in those targets.Compiler pre-processor directives now prefer
NETover a specific .NET version. We also addNETSTANDARD2_1so that features continue to work on older runtimes without a specific .NET target, i.e. 6 and 7.Docs PR to follow.