feat(metrics): add bound instruments behind experimental feature flag#3421

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bryantbiggs wants to merge 11 commits intoopen-telemetry:mainfrom

bryantbiggs:feat/bound-instruments

Commits on Apr 30, 2026

feat(metrics): add bound instruments behind experimental feature flag
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fix: correct import ordering for cargo fmt
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feat: add bound_count to TrackerEntry for bound instrument persistence
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fix(metrics): fix empty-attrs bind split and bind/collect eviction race
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revert(metrics): drop bound instruments from testing feature
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fix(metrics): replace bind() trait default panic with noop fallback
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fix(metrics): insert both original and sorted keys on bind()
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feat(metrics): make BoundCounter and BoundHistogram cloneable
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test(metrics): cover view filter and histogram empty-attr mixing
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fix(metrics): bind() at cardinality limit binds directly to overflow
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refactor(metrics): extend direct-bind to all aggregators
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