[rooks-ns]

Implement experimental composable view matching mode according to the OpenTelemetry Metrics SDK specification and declarative config schema.

• Introduce ViewMatchingMode (INDEPENDENT, COMPOSABLE).
• Track explicit View properties in ViewBuilder, View, and RegisteredView to distinguish configured fields from defaults.
• Implement composable view resolution in ViewRegistry: stream grouping by configured name, last-wins attribute/cardinality merging, backward-scanning aggregation compatibility fallback, and attribute filter conjunction.
• Add reflection bridge in SdkMeterProviderUtil to safely configure ViewMatchingMode on SdkMeterProviderBuilder without modifying public 1.x APIs.
• Wire view_matching_mode/development in MeterProviderFactory for declarative configuration.
• Add comprehensive unit and integration tests.

Fixes #9013

[opentelemetry-pr-dashboard]

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Waiting on the author · refreshed 2026-11-08 06:46 UTC

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[codecov]

Codecov Report

❌ Patch coverage is 90.05525% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.38%. Comparing base (f02bddc) to head (71baf95).

Files with missing lines	Patch %	Lines
...emetry/sdk/metrics/internal/view/ViewRegistry.java	92.85%	7 Missing and 2 partials ⚠️
...try/sdk/metrics/internal/SdkMeterProviderUtil.java	65.21%	8 Missing ⚠️
...figure/declarativeconfig/MeterProviderFactory.java	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9020      +/-   ##
============================================
+ Coverage     90.35%   90.38%   +0.03%     
- Complexity    11017    11071      +54     
============================================
  Files          1021     1022       +1     
  Lines         30128    30290     +162     
  Branches       3933     3966      +33     
============================================
+ Hits          27221    27377     +156     
+ Misses         1953     1951       -2     
- Partials        954      962       +8     

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