Avoid exposing configuration values in errors

[abdessattar23]

Malformed map properties and URL-encoded OTLP headers included their raw values in configuration exceptions. These values can contain credentials that subsequently appear in startup logs.

This preserves the property or header name while omitting its value. Regression tests use sentinel credentials to verify the messages remain redacted.

[opentelemetry-pr-dashboard]

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Waiting on reviewers · refreshed 2026-07-29 01:36 UTC

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.47%. Comparing base (6ffe557) to head (a057909).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8669      +/-   ##
============================================
- Coverage     91.47%   91.47%   -0.01%     
  Complexity    10457    10457              
============================================
  Files          1021     1021              
  Lines         27650    27649       -1     
  Branches       3242     3242              
============================================
- Hits          25293    25292       -1     
  Misses         1615     1615              
  Partials        742      742              

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