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Fix merging of code coverage reports - #7891
Merged
evgenyfedorov2 merged 2 commits intoNov 2, 2026
Merged
evgenyfedorov2 merged 2 commits into
evgenyfedorov2 merged 2 commits into
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dotnet-coverage merge loses branch data for lines that are partially covered in both the Windows and Ubuntu reports, so the branch coverage of the merged report was wrong. The per-project check also used the numbers from dotnet-coverage, while the Code Coverage tab shows the numbers from ReportGenerator, so the two didn't match. Merge the reports with ReportGenerator, which writes both the HTML report and a merged Cobertura file, and use that file for publishing and for the per-project check. Lower MinCodeCoverage for the projects that are below it with the correct numbers. Fixes dotnet#4124
Contributor
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🔵 Needs a closer look
Human review should confirm the revised thresholds against cross-platform pipeline reports before accepting the relaxation of five blocking coverage gates.
No open issues 🎉
What changed in this PR
Addresses #4124 by using ReportGenerator to merge Windows and Ubuntu coverage reports, preserving branch coverage and aligning published results with per-project checks.
Changes:
- Generate HTML and merged Cobertura output in one ReportGenerator step.
- Use the merged Cobertura file for both publishing and threshold validation.
- Lower 15 project thresholds to reflect corrected coverage; five previously blocking gates become warnings.
| File | Description |
|---|---|
| src/Libraries/Microsoft.Extensions.TimeProvider.Testing/Microsoft.Extensions.TimeProvider.Testing.csproj | Lower minimum coverage from 100% to 97%. |
| src/Libraries/Microsoft.Extensions.Http.Diagnostics/Microsoft.Extensions.Http.Diagnostics.csproj | Lower minimum coverage from 94% to 91%. |
| src/Libraries/Microsoft.Extensions.Diagnostics.Probes/Microsoft.Extensions.Diagnostics.Probes.csproj | Lower minimum coverage from 76% to 71%. |
| src/Libraries/Microsoft.Extensions.Diagnostics.HealthChecks.ResourceUtilization/Microsoft.Extensions.Diagnostics.HealthChecks.ResourceUtilization.csproj | Lower minimum coverage from 100% to 92%. |
| src/Libraries/Microsoft.Extensions.Diagnostics.HealthChecks.Common/Microsoft.Extensions.Diagnostics.HealthChecks.Common.csproj | Lower minimum coverage from 98% to 96%. |
| src/Libraries/Microsoft.Extensions.Diagnostics.ExceptionSummarization/Microsoft.Extensions.Diagnostics.ExceptionSummarization.csproj | Lower minimum coverage from 100% to 97%. |
| src/Libraries/Microsoft.Extensions.DataIngestion.Abstractions/Microsoft.Extensions.DataIngestion.Abstractions.csproj | Lower minimum coverage from 75% to 71%. |
| src/Libraries/Microsoft.Extensions.Compliance.Redaction/Microsoft.Extensions.Compliance.Redaction.csproj | Lower minimum coverage from 100% to 94%. |
| src/Libraries/Microsoft.Extensions.Compliance.Abstractions/Microsoft.Extensions.Compliance.Abstractions.csproj | Lower minimum coverage from 100% to 99%. |
| src/Libraries/Microsoft.Extensions.Caching.Hybrid/Microsoft.Extensions.Caching.Hybrid.csproj | Lower minimum coverage from 82% to 81%. |
| src/Libraries/Microsoft.AspNetCore.Diagnostics.Middleware/Microsoft.AspNetCore.Diagnostics.Middleware.csproj | Lower minimum coverage from 98% to 94%. |
| src/Generators/Microsoft.Gen.Metrics/Microsoft.Gen.Metrics.csproj | Lower minimum coverage from 99% to 97%. |
| src/Generators/Microsoft.Gen.Logging/Microsoft.Gen.Logging.csproj | Lower minimum coverage from 99% to 98%. |
| src/Generators/Microsoft.Gen.ComplianceReports/Microsoft.Gen.ComplianceReports.csproj | Lower minimum coverage from 98% to 96%. |
| src/Generators/Microsoft.Gen.BuildMetadata/Microsoft.Gen.BuildMetadata.csproj | Lower minimum coverage from 97% to 94%. |
| eng/pipelines/templates/VerifyCoverageReport.yml | Merge with ReportGenerator and share its Cobertura output across publishing and validation. |
Review effort: Balanced
Collaborator
🎉 Good job! The coverage increased 🎉
Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1651157&view=codecoverage-tab |
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Fixes #4124
dotnet-coverage mergeloses branch data for lines that are partially covered in both the Windows and Ubuntu reports, so the branch coverage of the merged report was wrong. For example,Microsoft.Extensions.TimeProvider.Testingshowed 100% while both reports have 97.5%. The per-project check also used the numbers fromdotnet-coverage, while the Code Coverage tab shows the numbers from ReportGenerator, so the two didn't match.Now ReportGenerator merges the two reports and writes both the HTML report and a merged Cobertura file. The publish step and the per-project check both use that file, so they show the same numbers.
With the correct numbers, 15 projects that passed before are below their
MinCodeCoverage, so I lowered it to match. Five of them were at 100, so for those a drop in coverage will now be a warning instead of a build failure.Microsoft Reviewers: Open in CodeFlow