[martincostello]

Fixes #8102 (comment).

Changes

Avoid emitting dangling separators.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, successful build/tests, etc.)
• Tests added/updated
• CHANGELOG.md file(s) updated for non-trivial changes
• Changes in public API reviewed (if applicable)
• AI usage disclosure:
  • No AI used
  • AI-assisted
  • Bulk AI-generated
• I have the experience and knowledge necessary to understand, review, and validate all content in this PR¹

Footnotes

1. Yes, I can answer maintainer questions about the content of this PR without using AI. ↩

[opentelemetry-pr-dashboard]

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[Copilot]

🟡 Changes recommended

The self-diagnostics output change for OTEL_RESOURCE_ATTRIBUTES lacks the required Unreleased changelog entry with a PR link.

1 open issue

• Add an Unreleased changelog entry for the behavior change · New

What changed in this PR

This follow-up to #8102 fixes dangling separators in the SDK's self-diagnostics display of OTEL_RESOURCE_ATTRIBUTES, while preserving redaction of malformed non-empty entries.

Changes:

• Skip empty attribute pairs and emit commas only between retained entries.
• Expand regression tests to cover leading, trailing, repeated, and empty-only separators.

File	Description
test/​OpenTelemetry.Tests/​Diagnostics/​SelfDiagnosticsEnvironmentVariablePolicyTests.cs	Adds parameterized coverage for malformed and empty attribute pairs.
src/​OpenTelemetry/​Internal/​Diagnostics/​SelfDiagnosticsEnvironmentVariablePolicy.cs	Moves empty-pair handling into the parsing loop to prevent dangling commas.

_{Review effort: Balanced}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.03%. Comparing base (bbf1923) to head (a434dd7).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8104      +/-   ##
==========================================
- Coverage   93.04%   93.03%   -0.02%     
==========================================
  Files         399      399              
  Lines       23476    23475       -1     
  Branches     4389     4389              
==========================================
- Hits        21843    21839       -4     
- Misses       1113     1115       +2     
- Partials      520      521       +1     

Flag	Coverage Δ
unittests-Project-Experimental	93.13% <100.00%> (-0.03%)	⬇️
unittests-Project-Stable	93.12% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ostics/SelfDiagnosticsEnvironmentVariablePolicy.cs	98.63% <100.00%> (-0.01%)	⬇️

... and 3 files with indirect coverage changes

[Copilot]

🟢 Approval recommended

No active review issues remain for the fix to dangling commas in self-diagnostics output.

No open issues 🎉

1 resolved since last review

• Add an Unreleased changelog entry for the behavior change

_{Review effort: Balanced}