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Until now, people set the 'DOTNET_DiagnosticPorts' environment variable at
launch/runtime to profile or trace an app.

When we added support for setting specific MSBuild properties to enable
diagnostics (DiagnosticsAddress, DiagnosticsSuspend, etc.), we end up
unconditionally setting the DOTNET_DiagnosticPorts environment variable,
effectively overwriting any value specified by customers when launching the
app.

This meant that existing (and fully functioning) profiling/tracing workflows
would only work if they set the DOTNET_DiagnosticPorts variable to the
defaults we have.

Fix this by allowing overriding DOTNET_DiagnosticPorts variable at launch/runtime.

…s when computed through our build logic.

Until now, people set the 'DOTNET_DiagnosticPorts' environment variable at
launch/runtime to profile or trace an app.

When we added support for setting specific MSBuild properties to enable
diagnostics (DiagnosticsAddress, DiagnosticsSuspend, etc.), we end up
unconditionally setting the DOTNET_DiagnosticPorts environment variable,
effectively overwriting any value specified by customers when launching the
app.

This meant that existing (and fully functioning) profiling/tracing workflows
would only work if they set the DOTNET_DiagnosticPorts variable to the
defaults we have.

Fix this by allowing overriding DOTNET_DiagnosticPorts variable at launch/runtime.
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✅ [CI Build #5937332] Build passed (Build packages) ✅

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✅ [PR Build #5937332] Build passed (Detect API changes) ✅

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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✅ [CI Build #5937332] Build passed (Build macOS tests) ✅

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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✅ API diff for current PR / commit

NET (empty diffs)

✅ API diff vs stable

NET (empty diffs)

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

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💻 [CI Build #5937332] Tests on macOS X64 - Mac Sonoma (14) passed 💻

All tests on macOS X64 - Mac Sonoma (14) passed.

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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💻 [CI Build #5937332] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

All tests on macOS arm64 - Mac Sequoia (15) passed.

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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💻 [CI Build #5937332] Tests on macOS M1 - Mac Monterey (12) passed 💻

All tests on macOS M1 - Mac Monterey (12) passed.

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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💻 [CI Build #5937332] Tests on macOS M1 - Mac Ventura (13) passed 💻

All tests on macOS M1 - Mac Ventura (13) passed.

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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💻 [CI Build #5937332] Tests on macOS arm64 - Mac Tahoe (26) passed 💻

All tests on macOS arm64 - Mac Tahoe (26) passed.

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Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

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🚀 [CI Build #5937332] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 128 tests passed 🎉

Tests counts

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 10 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 15 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 12 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 10 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: 59373324856010491bfc5e2d01fd1a4d39e199e4 [PR build]

@rolfbjarne rolfbjarne merged commit aad9803 into main Oct 14, 2025
41 checks passed
@rolfbjarne rolfbjarne deleted the dev/rolf/do-not-overwrite-DOTNET_DiagnosticPorts branch October 14, 2025 12:47
rolfbjarne added a commit that referenced this pull request Oct 15, 2025
…nosticPorts when computed through our build logic. (#23997)

Backport of #23993.
rolfbjarne added a commit that referenced this pull request Oct 15, 2025
…NET_DiagnosticPorts when computed through our build logic. (#23998)

Until now, people set the 'DOTNET_DiagnosticPorts' environment variable at
launch/runtime to profile or trace an app.

When we added support for setting specific MSBuild properties to enable
diagnostics (DiagnosticsAddress, DiagnosticsSuspend, etc.), we end up
unconditionally setting the DOTNET_DiagnosticPorts environment variable,
effectively overwriting any value specified by customers when launching the
app.

This meant that existing (and fully functioning) profiling/tracing workflows
would only work if they set the DOTNET_DiagnosticPorts variable to the
defaults we have.

Fix this by allowing overriding DOTNET_DiagnosticPorts variable at launch/runtime.

Backport of #23993.
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