[Metrics] New Attribute Processor for Exclude list

[nikhilbhatia08]

Fixes #3546

Changes

Created a new Attribute processor for exclude list as filter only partially exists for allowed list

This is the doc of spec - https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#stream-configuration

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.04%. Comparing base (79d43fc) to head (0f3bf65).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntelemetry/sdk/metrics/view/attributes_processor.h	88.89%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3633      +/-   ##
==========================================
- Coverage   90.05%   90.04%   -0.00%     
==========================================
  Files         220      220              
  Lines        7081     7097      +16     
==========================================
+ Hits         6376     6390      +14     
- Misses        705      707       +2     

Files with missing lines	Coverage Δ
...ntelemetry/sdk/metrics/view/attributes_processor.h	86.49% <88.89%> (+0.78%)	⬆️

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[Copilot]

Pull Request Overview

This PR implements a new FilteringExcludeAttributesProcessor class that filters out specified attributes from metrics, complementing the existing include-list functionality. The implementation follows the OpenTelemetry specification for stream configuration attribute filtering.

Key changes:

• Added FilteringExcludeAttributesProcessor class with exclude-list functionality
• Implemented corresponding unit tests to validate the new processor behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
sdk/include/opentelemetry/sdk/metrics/view/attributes_processor.h	Adds new FilteringExcludeAttributesProcessor class implementation
sdk/test/metrics/attributes_processor_test.cc	Adds unit tests for the new exclude-list attribute processor

[lalitb]

Thanks.

[marcalff]

Thanks for the fix.

The code looks ok, but the tests are inconclusive, and could be much stronger.

See comments.

[marcalff]

LGTM, thanks for the fix.