Support .NET 10 #6307

martincostello · 2025-06-07T13:36:23Z

Changes

Add support for building and testing with .NET 10.

Initially using .NET 10 Release Candidate 1.

Resolves #6059.

Merge requirement checklist

CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
Unit tests added/updated
Appropriate CHANGELOG.md files updated for non-trivial changes
~~Changes in public API reviewed (if applicable)~~

codecov · 2025-06-07T13:50:31Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.78%. Comparing base (19dda39) to head (af50b1a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6307      +/-   ##
==========================================
+ Coverage   86.69%   86.78%   +0.09%     
==========================================
  Files         258      258              
  Lines       11910    11910              
==========================================
+ Hits        10325    10336      +11     
+ Misses       1585     1574      -11

Flag	Coverage Δ
unittests-Project-Experimental	`86.61% <ø> (+0.33%)`	⬆️
unittests-Project-Stable	`86.60% <ø> (+0.05%)`	⬆️
unittests-Solution	`86.78% <ø> (+0.12%)`	⬆️
unittests-UnstableCoreLibraries-Experimental	`85.87% <ø> (ø)`

Flags with carried forward coverage won't be shown. Click here to find out more.
see 3 files with indirect coverage changes

martincostello · 2025-06-07T14:42:13Z

I don't know why the w3c-trace-context integration tests are failing.

martincostello · 2025-06-08T14:33:55Z

I don't know why the w3c-trace-context integration tests are failing.

Caused by this breaking change - just need to work out it seems to be applying to .NET 8, 9 & 10 in the W3C tests and why manually setting it back isn't working.

martincostello · 2025-06-08T15:21:27Z

just need to work out it seems to be applying to .NET 8, 9 & 10 in the W3C tests

Fixed the .NET 10 tests - the .NET 8 and 9 tests are failing because the .NET 8 and 9 runtimes aren't present in the docker image, so it rolls forward to .NET 10, then the breaking change applies (but can't be turned off because the new API is missing), so the tests fail.

martincostello · 2025-06-12T11:57:38Z

Fixed the .NET 10 tests - the .NET 8 and 9 tests are failing because the .NET 8 and 9 runtimes aren't present in the docker image, so it rolls forward to .NET 10, then the breaking change applies (but can't be turned off because the new API is missing), so the tests fail.

This wasn't correct - the actual reason was that all TFMs were referencing the 10.0.* package, so the breaking change was being applied. The fix was to use the workaround with all the TFMs.

Might need tweaking depending on the outcome of #6327.

Improve developer experience when troubleshooting failing tests (like I was in open-telemetry#6307) by logging both stderr and stdout and ignoring warnings in the upstream Python tests.

github-actions · 2025-06-20T03:33:03Z

This PR was marked stale due to lack of activity and will be closed in 7 days. Commenting or pushing will instruct the bot to automatically remove the label. This bot runs once per day.

Minimise diff and remove redundant changes.

Fix bad merge.

Re-enable tests that pass with System.DiagnosticSource v10. Fixes open-telemetry#6059.

martincostello · 2025-10-09T13:43:59Z

Once #6327 is merged I'll rebase this and update the CHANGELOGs.

Remove override.

Restore `Microsoft.Extensions.DependencyInjection.Abstractions` override, but update for .NET 10.

martincostello · 2025-10-09T20:27:42Z

NuGet packages and their dependencies are listed below, the diff for which is:

@@ -15,6 +15,11 @@
       "Microsoft.Extensions.Logging.Configuration": "9.0.0",
       "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
     },
+    "net10.0": {
+      "Microsoft.Extensions.Diagnostics.Abstractions": "10.0.0-rc.1.25451.107",
+      "Microsoft.Extensions.Logging.Configuration": "10.0.0-rc.1.25451.107",
+      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
+    },
     "net8.0": {
       "Microsoft.Extensions.Diagnostics.Abstractions": "8.0.0",
       "Microsoft.Extensions.Logging.Configuration": "8.0.0",
@@ -28,16 +33,17 @@
   },
   "OpenTelemetry.Api": {
     ".NETFramework4.6.2": {
-      "System.Diagnostics.DiagnosticSource": "9.0.0"
+      "System.Diagnostics.DiagnosticSource": "10.0.0-rc.1.25451.107"
     },
     ".NETStandard2.0": {
-      "System.Diagnostics.DiagnosticSource": "9.0.0"
+      "System.Diagnostics.DiagnosticSource": "10.0.0-rc.1.25451.107"
     },
+    "net10.0": {},
     "net8.0": {
-      "System.Diagnostics.DiagnosticSource": "9.0.0"
+      "System.Diagnostics.DiagnosticSource": "10.0.0-rc.1.25451.107"
     },
     "net9.0": {
-      "System.Diagnostics.DiagnosticSource": "9.0.0"
+      "System.Diagnostics.DiagnosticSource": "10.0.0-rc.1.25451.107"
     }
   },
   "OpenTelemetry.Api.ProviderBuilderExtensions": {
@@ -49,6 +55,10 @@
       "Microsoft.Extensions.DependencyInjection.Abstractions": "9.0.0",
       "OpenTelemetry.Api": "*"
     },
+    "net10.0": {
+      "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.0-rc.1.25451.107",
+      "OpenTelemetry.Api": "*"
+    },
     "net8.0": {
       "Microsoft.Extensions.DependencyInjection.Abstractions": "8.0.0",
       "OpenTelemetry.Api": "*"
@@ -69,9 +79,11 @@
       "System.Text.Encodings.Web": "4.7.2",
       "System.Text.Json": "4.7.2"
     },
+    "net10.0": {
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
-      "OpenTelemetry": "*",
-      "System.Text.Json": "8.0.5"
+      "OpenTelemetry": "*"
     },
     "net9.0": {
       "OpenTelemetry": "*"
@@ -84,6 +96,9 @@
     ".NETStandard2.0": {
       "OpenTelemetry": "*"
     },
+    "net10.0": {
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
       "OpenTelemetry": "*"
     },
@@ -101,6 +116,9 @@
     ".NETStandard2.1": {
       "OpenTelemetry": "*"
     },
+    "net10.0": {
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
       "Microsoft.Extensions.Configuration.Binder": "8.0.2",
       "OpenTelemetry": "*"
@@ -110,6 +128,9 @@
     }
   },
   "OpenTelemetry.Exporter.Prometheus.AspNetCore": {
+    "net10.0": {
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
       "OpenTelemetry": "*"
     },
@@ -124,6 +145,9 @@
     ".NETStandard2.0": {
       "OpenTelemetry": "*"
     },
+    "net10.0": {
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
       "OpenTelemetry": "*"
     },
@@ -142,9 +166,11 @@
       "System.Text.Encodings.Web": "4.7.2",
       "System.Text.Json": "4.7.2"
     },
+    "net10.0": {
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
-      "OpenTelemetry": "*",
-      "System.Text.Json": "8.0.5"
+      "OpenTelemetry": "*"
     },
     "net9.0": {
       "OpenTelemetry": "*"
@@ -159,6 +185,10 @@
       "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
       "OpenTelemetry": "*"
     },
+    "net10.0": {
+      "Microsoft.Extensions.Hosting.Abstractions": "10.0.0-rc.1.25451.107",
+      "OpenTelemetry": "*"
+    },
     "net8.0": {
       "Microsoft.Extensions.Hosting.Abstractions": "8.0.0",
       "OpenTelemetry": "*"
@@ -175,6 +205,9 @@
     ".NETStandard2.0": {
       "OpenTelemetry.Api": "*"
     },
+    "net10.0": {
+      "OpenTelemetry.Api": "*"
+    },
     "net8.0": {
       "OpenTelemetry.Api": "*"
     },
@@ -191,6 +224,10 @@
       "OpenTelemetry.Api": "*",
       "OpenTracing": "[0.12.1, 0.13.0)"
     },
+    "net10.0": {
+      "OpenTelemetry.Api": "*",
+      "OpenTracing": "[0.12.1, 0.13.0)"
+    },
     "net8.0": {
       "OpenTelemetry.Api": "*",
       "OpenTracing": "[0.12.1, 0.13.0)"

main (19dda39)

{
  "OpenTelemetry": {
    ".NETFramework4.6.2": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
    ".NETStandard2.0": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
    ".NETStandard2.1": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
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      "Microsoft.Extensions.Logging.Configuration": "8.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
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      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    }
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  "OpenTelemetry.Api": {
    ".NETFramework4.6.2": {
      "System.Diagnostics.DiagnosticSource": "9.0.0"
    },
    ".NETStandard2.0": {
      "System.Diagnostics.DiagnosticSource": "9.0.0"
    },
    "net8.0": {
      "System.Diagnostics.DiagnosticSource": "9.0.0"
    },
    "net9.0": {
      "System.Diagnostics.DiagnosticSource": "9.0.0"
    }
  },
  "OpenTelemetry.Api.ProviderBuilderExtensions": {
    ".NETFramework4.6.2": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "9.0.0",
      "OpenTelemetry.Api": "*"
    },
    ".NETStandard2.0": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "9.0.0",
      "OpenTelemetry.Api": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "8.0.0",
      "OpenTelemetry.Api": "*"
    },
    "net9.0": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "9.0.0",
      "OpenTelemetry.Api": "*"
    }
  },
  "OpenTelemetry.Exporter.Console": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    "net8.0": {
      "OpenTelemetry": "*",
      "System.Text.Json": "8.0.5"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.InMemory": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.OpenTelemetryProtocol": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.1": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.Configuration.Binder": "8.0.2",
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.Prometheus.AspNetCore": {
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.Prometheus.HttpListener": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.Zipkin": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    "net8.0": {
      "OpenTelemetry": "*",
      "System.Text.Json": "8.0.5"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Extensions.Hosting": {
    ".NETFramework4.6.2": {
      "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "8.0.0",
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Extensions.Propagators": {
    ".NETFramework4.6.2": {
      "OpenTelemetry.Api": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry.Api": "*"
    },
    "net8.0": {
      "OpenTelemetry.Api": "*"
    },
    "net9.0": {
      "OpenTelemetry.Api": "*"
    }
  },
  "OpenTelemetry.Shims.OpenTracing": {
    ".NETFramework4.6.2": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    ".NETStandard2.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    "net8.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    "net9.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    }
  }
}

This PR (c986343)

{
  "OpenTelemetry": {
    ".NETFramework4.6.2": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
    ".NETStandard2.0": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
    ".NETStandard2.1": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
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      "Microsoft.Extensions.Logging.Configuration": "10.0.0-rc.1.25451.107",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.Diagnostics.Abstractions": "8.0.0",
      "Microsoft.Extensions.Logging.Configuration": "8.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    },
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      "Microsoft.Extensions.Diagnostics.Abstractions": "9.0.0",
      "Microsoft.Extensions.Logging.Configuration": "9.0.0",
      "OpenTelemetry.Api.ProviderBuilderExtensions": "*"
    }
  },
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    ".NETFramework4.6.2": {
      "System.Diagnostics.DiagnosticSource": "10.0.0-rc.1.25451.107"
    },
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    },
    "net10.0": {},
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    },
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    }
  },
  "OpenTelemetry.Api.ProviderBuilderExtensions": {
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      "OpenTelemetry.Api": "*"
    },
    ".NETStandard2.0": {
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    "net10.0": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.0-rc.1.25451.107",
      "OpenTelemetry.Api": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "8.0.0",
      "OpenTelemetry.Api": "*"
    },
    "net9.0": {
      "Microsoft.Extensions.DependencyInjection.Abstractions": "9.0.0",
      "OpenTelemetry.Api": "*"
    }
  },
  "OpenTelemetry.Exporter.Console": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    "net10.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.InMemory": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*"
    },
    "net10.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.OpenTelemetryProtocol": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.1": {
      "OpenTelemetry": "*"
    },
    "net10.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.Configuration.Binder": "8.0.2",
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.Prometheus.AspNetCore": {
    "net10.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.Prometheus.HttpListener": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*"
    },
    "net10.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Exporter.Zipkin": {
    ".NETFramework4.6.2": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    ".NETStandard2.0": {
      "OpenTelemetry": "*",
      "System.Text.Encodings.Web": "4.7.2",
      "System.Text.Json": "4.7.2"
    },
    "net10.0": {
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Extensions.Hosting": {
    ".NETFramework4.6.2": {
      "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
      "OpenTelemetry": "*"
    },
    ".NETStandard2.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
      "OpenTelemetry": "*"
    },
    "net10.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "10.0.0-rc.1.25451.107",
      "OpenTelemetry": "*"
    },
    "net8.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "8.0.0",
      "OpenTelemetry": "*"
    },
    "net9.0": {
      "Microsoft.Extensions.Hosting.Abstractions": "9.0.0",
      "OpenTelemetry": "*"
    }
  },
  "OpenTelemetry.Extensions.Propagators": {
    ".NETFramework4.6.2": {
      "OpenTelemetry.Api": "*"
    },
    ".NETStandard2.0": {
      "OpenTelemetry.Api": "*"
    },
    "net10.0": {
      "OpenTelemetry.Api": "*"
    },
    "net8.0": {
      "OpenTelemetry.Api": "*"
    },
    "net9.0": {
      "OpenTelemetry.Api": "*"
    }
  },
  "OpenTelemetry.Shims.OpenTracing": {
    ".NETFramework4.6.2": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    ".NETStandard2.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    "net10.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    "net8.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    },
    "net9.0": {
      "OpenTelemetry.Api": "*",
      "OpenTracing": "[0.12.1, 0.13.0)"
    }
  }
}

Generated with Program.cs

#:property Nullable=disable
#:property PublishAot=false

using System.Text.Json;

var result = new SortedDictionary<string, SortedDictionary<string, SortedDictionary<string, string>>>();

foreach (var file in Directory.GetFiles(args[0], "*.nupkg", SearchOption.TopDirectoryOnly).Order())
{
    await using var archive = System.IO.Compression.ZipFile.OpenRead(file);

    if (archive.Entries.FirstOrDefault(x => x.FullName.EndsWith(".nuspec", StringComparison.OrdinalIgnoreCase)) is not { } entry)
    {
        continue;
    }

    await using var stream = entry.Open();
    using var reader = new StreamReader(stream);

    var nuspec = System.Xml.Linq.XDocument.Parse(await reader.ReadToEndAsync());

    var ns = nuspec.Root.GetDefaultNamespace();
    var metadata = nuspec.Root.Element(ns + "metadata");
    var package = metadata.Element(ns + "id").Value;
    var dependencies = metadata.Element(ns + "dependencies");

    var groups = new SortedDictionary<string, SortedDictionary<string, string>>();
    if (dependencies != null)
    {
        foreach (var group in dependencies.Elements(ns + "group"))
        {
            var tfm = group.Attribute("targetFramework")?.Value;

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            {
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            foreach (var element in group.Elements(ns + "dependency"))
            {
                var id = element.Attribute("id").Value;
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        }
    }

    result[package] = groups;
}

// Remove versions that reference other packages we scanned - they will have different MinVer versions that we don't care about
foreach ((var id, var groups) in result)
{
    foreach ((var tfm, var group) in groups)
    {
        foreach (var other in result.Keys)
        {
            if (group.ContainsKey(other))
            {
                group[other] = "*";
            }
        }
    }
}

#pragma warning disable CA1869 // Cache and reuse 'JsonSerializerOptions' instances
var options = new JsonSerializerOptions
{
    NewLine = "\n",
    WriteIndented = true
};
#pragma warning restore CA1869 // Cache and reuse 'JsonSerializerOptions' instances

await Console.Out.WriteLineAsync(JsonSerializer.Serialize(result, options));

Add CHANGELOG entries for .NET 10.

Copilot

Pull Request Overview

This PR adds support for .NET 10.0 to the OpenTelemetry .NET project, upgrading from .NET 9.0 Release Candidate to .NET 10.0 Release Candidate 1. The changes enable building and testing with the new framework version.

Updates target frameworks across the solution to include net10.0
Upgrades package references to .NET 10.0 RC1 versions
Removes workarounds for DiagnosticSource bugs that were fixed in .NET 10

Reviewed Changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
global.json	Updates SDK version to .NET 10.0 RC1
build/Common.props	Adds net10.0 to target framework configurations
Directory.Packages.props	Updates package versions to .NET 10.0 RC1
test/OpenTelemetry.Tests/Trace/SamplersTests.cs	Enables previously disabled assertions due to .NET 10 bug fixes
test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/W3CTraceContextTests.cs	Adds workaround for W3C trace context propagator changes
Multiple CHANGELOG.md files	Documents .NET 10.0 support addition
Multiple Dockerfiles	Updates Docker images to .NET 10.0 RC1
GitHub workflow files	Adds net10.0 to test matrices

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examples/MicroserviceExample/WebApi/Dockerfile

martincostello force-pushed the dotnet-10 branch from 515bfe4 to dd5b249 Compare June 8, 2025 09:55

github-actions bot removed pkg:OpenTelemetry.Exporter.Prometheus.HttpListener Issues related to OpenTelemetry.Exporter.Prometheus.HttpListener NuGet package pkg:OpenTelemetry.Exporter.Zipkin Issues related to OpenTelemetry.Exporter.Zipkin NuGet package labels Jun 8, 2025

martincostello mentioned this pull request Jun 10, 2025

[Infra] Ensure .NET 8 is installed #6313

Merged

4 tasks

martincostello force-pushed the dotnet-10 branch from a1fed39 to 097d765 Compare June 11, 2025 11:32

martincostello mentioned this pull request Jun 12, 2025

[Infra] Match runtime packages to runtime major version #6327

Merged

4 tasks

martincostello force-pushed the dotnet-10 branch from f3d1c7b to d7b4e05 Compare June 12, 2025 11:59

martincostello mentioned this pull request Jun 13, 2025

[W3C] Refactor W3C integration tests #6328

Merged

4 tasks

github-actions bot added the Stale Issues and pull requests which have been flagged for closing due to inactivity label Jun 20, 2025

martincostello force-pushed the dotnet-10 branch from d7b4e05 to 86adb79 Compare June 20, 2025 06:58

github-actions bot removed the Stale Issues and pull requests which have been flagged for closing due to inactivity label Jun 21, 2025

martincostello force-pushed the dotnet-10 branch 2 times, most recently from f2211e4 to ac4df46 Compare June 25, 2025 08:10

[Infra] Revert some global.json changes

fef8a4d

Minimise diff and remove redundant changes.

martincostello force-pushed the dotnet-10 branch from 81d3da0 to fef8a4d Compare September 19, 2025 13:37

martincostello added 5 commits September 25, 2025 09:32

Merge branch 'main' into dotnet-10

654d044

Merge branch 'main' into dotnet-10

c87de26

Merge branch 'main' into dotnet-10

3657e99

[OTLP] Fix Dockerfile

3165ba3

Fix bad merge.

[OpenTelemetry] Enable assertions

256814b

Re-enable tests that pass with System.DiagnosticSource v10. Fixes open-telemetry#6059.

martincostello linked an issue Oct 9, 2025 that may be closed by this pull request

Update sampler tests for DS v10 #6059

Open

github-actions bot added the pkg:OpenTelemetry Issues related to OpenTelemetry NuGet package label Oct 9, 2025

martincostello mentioned this pull request Oct 9, 2025

[DS10] Support SchemaUrl on ActivitySource & Meter #6164

Open

martincostello added 3 commits October 9, 2025 21:11

Merge branch 'main' into dotnet-10

3d0e2bd

[W3C] Fix build

8177165

Remove override.

[W3C] Fix integrqation tests

c986343

Restore `Microsoft.Extensions.DependencyInjection.Abstractions` override, but update for .NET 10.

[Infra] Update CHANGELOGs

af50b1a

Add CHANGELOG entries for .NET 10.

martincostello changed the title ~~[WIP] Support .NET 10~~ Support .NET 10 Oct 9, 2025

martincostello marked this pull request as ready for review October 9, 2025 20:54

martincostello requested a review from a team as a code owner October 9, 2025 20:54

Copilot AI review requested due to automatic review settings October 9, 2025 20:54

Copilot AI reviewed Oct 9, 2025

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