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[RELEASE] Release opentelemetry-cpp 1.21.0 (#3445)
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‎CHANGELOG.md

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## [Unreleased]
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* [BUILD] Propagate INTERFACE_COMPILE_DEFINITIONS from API through common_foo_library
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[#3440](https://github.com/open-telemetry/opentelemetry-cpp/pull/3440)
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## [1.21 2025-05-28]
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* [BUILD] Error out when building DLL without MSVC
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[#3438](https://github.com/open-telemetry/opentelemetry-cpp/pull/3438)
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* [BUILD] Remove WITH_ABSEIL
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[#3318](https://github.com/open-telemetry/opentelemetry-cpp/pull/3318)
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* [Metrics SDK] Use nostd::function_ref in AttributesHashMap
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[#3393](https://github.com/open-telemetry/opentelemetry-cpp/pull/3393)
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* [INSTALL] Add CMake components to the opentelemetry-cpp package
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[#3320](https://github.com/open-telemetry/opentelemetry-cpp/pull/3220)
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* [SDK] Base2 exponential histogram aggregation
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[#3175](https://github.com/open-telemetry/opentelemetry-cpp/pull/3346)
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* [CI] Harden GitHub Actions
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[#3338](https://github.com/open-telemetry/opentelemetry-cpp/pull/3338)
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New Features:
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* [StepSecurity] Harden GibHub Actions, part 2
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[#3340](https://github.com/open-telemetry/opentelemetry-cpp/pull/3340)
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Add base2 exponential histogram aggregation. Includes a new aggregation type,
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ostream exporter, and otlp/grpc exporter. Updated histogram aggregation and
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benchmark tests.
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* Bump github/codeql-action from 3.28.12 to 3.28.13
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[#3341](https://github.com/open-telemetry/opentelemetry-cpp/pull/3341)
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* [API] Remove `WITH_ABSEIL` and `HAVE_ABSEIL`
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[#3318](https://github.com/open-telemetry/opentelemetry-cpp/pull/3318)
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* [DEVCONTAINER] expose cmake version setting as docker arg and environment variable
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[#3347](https://github.com/open-telemetry/opentelemetry-cpp/pull/3347)
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* [CI] disable bzip2 in conan builds
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[#3352](https://github.com/open-telemetry/opentelemetry-cpp/pull/3352)
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* [SEMANTIC CONVENTIONS] Upgrade semantic conventions to 1.32.0
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[#3351](https://github.com/open-telemetry/opentelemetry-cpp/pull/3351)
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* [CMAKE] Bump cmake minimum required version to 3.14
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* Bump github/codeql-action from 3.28.13 to 3.28.15
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[#3353](https://github.com/open-telemetry/opentelemetry-cpp/pull/3353)
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* [CMAKE] bump cmake minimum required version to 3.14
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[#3349](https://github.com/open-telemetry/opentelemetry-cpp/pull/3349)
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* Bump codecov/codecov-action from 5.4.0 to 5.4.2
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[#3362](https://github.com/open-telemetry/opentelemetry-cpp/pull/3362)
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* [DOC] Fix documentation tags in logger API
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[#3371](https://github.com/open-telemetry/opentelemetry-cpp/pull/3371)
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* [CI] fix artifacts download/upload
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[#3369](https://github.com/open-telemetry/opentelemetry-cpp/pull/3369)
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* [API] Add Enabled method to Tracer
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[#3357](https://github.com/open-telemetry/opentelemetry-cpp/pull/3357)
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* [SDK] Optimize PeriodicExportingMetricReader thread usage
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* [BUILD] Fixes warnings of ciso646 in C++17
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[#3360](https://github.com/open-telemetry/opentelemetry-cpp/pull/3360)
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* Bump github/codeql-action from 3.28.15 to 3.28.16
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[#3377](https://github.com/open-telemetry/opentelemetry-cpp/pull/3377)
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* Bump step-security/harden-runner from 2.11.1 to 2.12.0
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[#3373](https://github.com/open-telemetry/opentelemetry-cpp/pull/3373)
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* Bump docker/build-push-action from 6.15.0 to 6.16.0
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[#3382](https://github.com/open-telemetry/opentelemetry-cpp/pull/3382)
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* Bump actions/download-artifact from 4.2.1 to 4.3.0
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[#3381](https://github.com/open-telemetry/opentelemetry-cpp/pull/3381)
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* [CI] Harden Github actions - pinned-dependencies (part -1)
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[#3380](https://github.com/open-telemetry/opentelemetry-cpp/pull/3380)
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* [StepSecurity] ci: Harden GitHub Actions
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[#3378](https://github.com/open-telemetry/opentelemetry-cpp/pull/3378)
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* [SDK] Base2 exponential histogram aggregation
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[#3346](https://github.com/open-telemetry/opentelemetry-cpp/pull/3346)
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* [StepSecurity] ci: Harden GitHub Actions
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[#3379](https://github.com/open-telemetry/opentelemetry-cpp/pull/3379)
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* [BUILD] Fixes glibc++ 5 checking
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[#3355](https://github.com/open-telemetry/opentelemetry-cpp/pull/3355)
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* [TEST] Add stress test for histogram metric for multiple threads validation
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[#3388](https://github.com/open-telemetry/opentelemetry-cpp/pull/3388)
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* Bump github/codeql-action from 3.28.16 to 3.28.17
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[#3389](https://github.com/open-telemetry/opentelemetry-cpp/pull/3389)
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* [SDK] Optimize PeriodicExportingMetricReader Thread Usage
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[#3383](https://github.com/open-telemetry/opentelemetry-cpp/pull/3383)
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* [SDK] Aggregate identical metrics instruments and detect duplicates
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* [Metrics SDK] Use nostd::function_ref in AttributesHashMap
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[#3393](https://github.com/open-telemetry/opentelemetry-cpp/pull/3393)
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* [SDK] support aggregation of identical instruments
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[#3358](https://github.com/open-telemetry/opentelemetry-cpp/pull/3358)
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* [INSTALL] Add CMake components to the opentelemetry-cpp package
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[#3320](https://github.com/open-telemetry/opentelemetry-cpp/pull/3220)
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[#3368](https://github.com/open-telemetry/opentelemetry-cpp/pull/3368)
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* [BUILD] Fixes unused var
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[#3397](https://github.com/open-telemetry/opentelemetry-cpp/pull/3397)
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* [BUILD] Upgrade opentelemetry-proto to 1.6.0
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[#3407](https://github.com/open-telemetry/opentelemetry-cpp/pull/3407)
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* [INSTALL] Unify cmake install functions and dynamically set component dependencies
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[#3368](https://github.com/open-telemetry/opentelemetry-cpp/pull/3368)
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* [BUILD] Upgrade nlohmann_json to 3.12.0
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[#3406](https://github.com/open-telemetry/opentelemetry-cpp/pull/3406)
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* [CMAKE] Add generated protobuf headers to the opentelemetry_proto target
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* [BUILD] Upgrade opentelemetry-proto to 1.6.0
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[#3407](https://github.com/open-telemetry/opentelemetry-cpp/pull/3407)
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* [CMAKE] add generated protobuf headers to the opentelemetry_proto target
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[#3400](https://github.com/open-telemetry/opentelemetry-cpp/pull/3400)
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* [CMAKE] Remove include_directories usage and rely on target properties
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* [MERGE] Fix accidental rollback of nlohmann-json submodule
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[#3415](https://github.com/open-telemetry/opentelemetry-cpp/pull/3415)
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* Bump fossas/fossa-action from 1.6.0 to 1.7.0
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[#3414](https://github.com/open-telemetry/opentelemetry-cpp/pull/3414)
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* Bump docker/build-push-action from 6.16.0 to 6.17.0
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[#3420](https://github.com/open-telemetry/opentelemetry-cpp/pull/3420)
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* Bump codecov/codecov-action from 5.4.2 to 5.4.3
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[#3419](https://github.com/open-telemetry/opentelemetry-cpp/pull/3419)
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* [SEMANTIC CONVENTIONS] Upgrade semantic conventions to 1.33
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[#3416](https://github.com/open-telemetry/opentelemetry-cpp/pull/3416)
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* [DOCS] update the INSTALL guide on cmake components
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[#3422](https://github.com/open-telemetry/opentelemetry-cpp/pull/3422)
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* Bump github/codeql-action from 3.28.17 to 3.28.18
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[#3423](https://github.com/open-telemetry/opentelemetry-cpp/pull/3423)
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* [CMAKE] update cmake files in examples directory
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[#3421](https://github.com/open-telemetry/opentelemetry-cpp/pull/3421)
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* [SDK] Fix Base2ExponentialHistogramAggregation Merge with empty buckets
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[#3425](https://github.com/open-telemetry/opentelemetry-cpp/pull/3425)
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* [SDK] Fix MetricProducer interface
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[#3413](https://github.com/open-telemetry/opentelemetry-cpp/pull/3413)
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* [CMAKE] remove global include_directories usage and rely on target properties
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[#3426](https://github.com/open-telemetry/opentelemetry-cpp/pull/3426)
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* [BUILD] remove unused WITH_CURL build flag
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[#3429](https://github.com/open-telemetry/opentelemetry-cpp/pull/3429)
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* [SEMANTIC CONVENTIONS] Upgrade to semantic conventions 1.34.0
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[#3428](https://github.com/open-telemetry/opentelemetry-cpp/pull/3428)
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* [EXPORTER] ostream log exporter, fixed memory ownership issues
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* [EXPORTER] ostream log exporter, fix memory ownership issues
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[#3417](https://github.com/open-telemetry/opentelemetry-cpp/pull/3417)
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* [TEST] Test all components in a CMake super build
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* [TEST] add all components to the cmake fetch content test
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[#3433](https://github.com/open-telemetry/opentelemetry-cpp/pull/3433)
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* [BUILD] Error out when building DLL without MSVC
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[#3438](https://github.com/open-telemetry/opentelemetry-cpp/pull/3438)
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* [BUILD] Add missing CMake keyword for target_link_libraries
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[#3442](https://github.com/open-telemetry/opentelemetry-cpp/pull/3442)
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* [CMAKE] Remove third-party version mismatch warning
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[#3432](https://github.com/open-telemetry/opentelemetry-cpp/pull/3432)
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* Bump docker/build-push-action from 6.17.0 to 6.18.0
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[#3446](https://github.com/open-telemetry/opentelemetry-cpp/pull/3446)
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* [SEMANTIC CONVENTIONS] Fix comment style to preserve markup.
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[#3444](https://github.com/open-telemetry/opentelemetry-cpp/pull/3444)
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* [EXPORTER] support unix sockets in grpc client
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[#3410](https://github.com/open-telemetry/opentelemetry-cpp/pull/3410)
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* [BUILD] Propagate INTERFACE_COMPILE_DEFINITIONS from API through common_foo_library
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[#3440](https://github.com/open-telemetry/opentelemetry-cpp/pull/3440)
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New Features:
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* [SDK] Base2 exponential histogram aggregation
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[#3346](https://github.com/open-telemetry/opentelemetry-cpp/pull/3346)
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* Add base2 exponential histogram aggregation. Includes a new aggregation type,
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ostream exporter, and otlp/grpc exporter. Updated histogram aggregation and
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benchmark tests.
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Important changes:
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* [EXPORTER] ostream log exporter, fixed memory ownership issues
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* Applications not using these SDK classes directly are not affected.
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* [BUILD] Remove WITH_ABSEIL
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[#3318](https://github.com/open-telemetry/opentelemetry-cpp/pull/3318)
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* The build option `WITH_ABSEIL` is no longer used, and opentelemetry-cpp
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will no longer use any release of abseil provided externally,
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for its own use.
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* Instead, opentelemetry-cpp will only use an internal abseil version.
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* This change resolves long standing binary integrity issues,
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that occurred in the past when mixing several versions of abseil
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in the build.
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## [1.20 2025-04-01]
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* [BUILD] Update opentelemetry-proto version

‎MODULE.bazel

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module(
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name = "opentelemetry-cpp",
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version = "1.17.0",
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version = "1.21.0",
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compatibility_level = 0,
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repo_name = "io_opentelemetry_cpp",
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)

‎api/include/opentelemetry/version.h

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# define OPENTELEMETRY_ABI_VERSION_NO 1
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#endif
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#define OPENTELEMETRY_VERSION "1.20.0"
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#define OPENTELEMETRY_VERSION "1.21.0"
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#define OPENTELEMETRY_VERSION_MAJOR 1
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#define OPENTELEMETRY_VERSION_MINOR 20
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#define OPENTELEMETRY_VERSION_MINOR 21
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#define OPENTELEMETRY_VERSION_PATCH 0
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#define OPENTELEMETRY_ABI_VERSION OPENTELEMETRY_STRINGIFY(OPENTELEMETRY_ABI_VERSION_NO)

‎docs/public/conf.py

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author = 'OpenTelemetry authors'
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# The full version, including alpha/beta/rc tags
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release = "1.20.0"
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release = "1.21.0"
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# Run sphinx on subprojects and copy output
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# -----------------------------------------

‎sdk/include/opentelemetry/sdk/version/version.h

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#pragma once
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#define OPENTELEMETRY_SDK_VERSION "1.20.0"
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#define OPENTELEMETRY_SDK_VERSION "1.21.0"
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#include "opentelemetry/version.h"
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‎sdk/src/version/version.cc

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namespace version
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{
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const int major_version = 1;
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const int minor_version = 20;
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const int minor_version = 21;
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const int patch_version = 0;
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const char *pre_release = "NONE";
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const char *build_metadata = "NONE";
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const char *short_version = "1.20.0";
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const char *full_version = "1.20.0-NONE-NONE";
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const char *build_date = "Tue Apr 1 08:14:47 PM UTC 2025";
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const char *short_version = "1.21.0";
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const char *full_version = "1.21.0-NONE-NONE";
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const char *build_date = "Wed May 28 08:08:27 PM UTC 2025";
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} // namespace version
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} // namespace sdk
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OPENTELEMETRY_END_NAMESPACE

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