v1.16.1 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [BUILD] Add bazel missing BUILD file by @tdat00 in #2720
• [SDK] Added reserve for spans array in BatchSpanProcessor. by @msiddhu in #2724
• [DOC] Update "Using triplets" section in building-with-vcpkg documentation. by @Pravila00 in #2726
• [DOC] Remove comment for unused LoggerProvider initialization params by @herman5 in #2972
• [SECURITY] Remove OTLP HTTP support for TLS 1.0 and TLS 1.1, require TLS 1.2 by @marcalff in #2722
• [TEST] Fix opentelemetry-collector bind address by @marcalff in #2989
• [EXPORTER] Fix references in AttributeValueVisitor by @meastp in #2985
• [Code health] include-what-you-use cleanup, part 2 by @marcalff in #2704
• [Code Health] clang-tidy cleanup, part 1 by @msiddhu in #2990
• [CI] Build failures with ABSEIL 20240116 and CMAKE 3.30 by @marcalff in #3002
• [CI] Enable bzlmod by @keith in #2995
• [Metrics SDK] Fix hash calculation for nostd::string by @lalitb in #2999
• [RELEASE] Release opentelemetry-cpp version 1.16.1 by @marcalff in #3007

Breaking changes

• [SECURITY] Remove OTLP HTTP support for TLS 1.0 and TLS 1.1,
  require TLS 1.2 or better
  #2722
  • The OTLP HTTP exporter no longer accept options like:
    • min_TLS = 1.0
    • min_TLS = 1.1
    • max_TLS = 1.0
    • max_TLS = 1.1
  • When connecting to an OTLP HTTP endpoint, using https,
    the connection will require TLS 1.2 by default,
    unless min_TLS is set to 1.3
  • Plain http connections (insecure) are not affected.

New Contributors

• @tdat00 made their first contribution in #2720
• @msiddhu made their first contribution in #2724
• @Pravila00 made their first contribution in #2726
• @herman5 made their first contribution in #2972

Full Changelog: v1.16.0...v1.16.1

v1.16.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [BUILD] Upgrade bazel abseil from 20220623.1 to 20230802.2 by @marcalff in #2650
• [BUILD] Use nostd::enable_if_t instead of std::enable_if_t by @owent in #2648
• [EXEMPLAR] Update ExemplarFilter and ExemplarReservoir for spec by @ThomsonTan in #2372
• [BUILD] Link CoreFoundation on apple systems because some dependency packages require it by @owent in #2655
• [SDK] Avoid missing conditional variable update and simplify atomic bool by @arekay in #2553
• [BUILD] Build break in OLTP_FILE tests by @marcalff in #2659
• [EXPORTER] General cleanup for is_shutdown_ flags in exporters. by @marcalff in #2663
• [CI] Upgrade Maintainers CI to ubuntu-24.04 by @marcalff in #2670
• [BUILD] Upgrade to opentelemetry-proto 1.3.1 by @marcalff in #2669
• [API] Return NoopLogRecord from NoopLogger by @marcalff in #2668
• [BUILD] Remove the hard-coded separator in tracestate by @ThomsonTan in #2672
• [SDK] Fix forceflush may wait for ever by @owent in #2584
• [API] DO not allow unsafe Logger::EmitLogRecord by @owent in #2673
• [BUILD] Read default proto version from third_party_release by @owent in #2677
• [CI] include-what-you-use by @marcalff in #2629
• [CI] Upgrade to clang-format 18 by @marcalff in #2684
• [CI] Fix CI failures on Ubuntu 24.04 by @lalitb in #2686
• [SEMANTIC CONVENTIONS] Upgrade to version 1.26.0 by @marcalff in #2687
• [API/SDK] Provider cleanup by @marcalff in #2664
• [ETW] Add table name mapping for Logs other than the default Log table by @ThomsonTan in #2691
• [CI] Remove benchmark overlay for vcpkg by @ThomsonTan in #2695
• [BUILD] Remove the incorrect set of CMAKE_MSVC_RUNTIME_LIBRARY for vcpkg by @ThomsonTan in #2696
• [BUILD] CMakeLists.txt: Enable CMAKE_MSVC_RUNTIME_LIBRARY support by @t-b in #2652
• [EXPORTER] OTLP file: use thread-safe file/io by @owent in #2675
• [bazel] Bump version and deps by @keith in #2679
• [BUILD] Add support for bzlmod by @keith in #2608
• [BUILD] Fix Import Abseil-cpp by @LeiZhang-Hunter in #2701
• [Code health] include-what-you-use cleanup by @marcalff in #2692
• [BUILD] Restore Bazel flag removed from public API by @dbolduc in #2702
• [DOC] Fix typo tace_id -> trace_id in logger.h by @yijiem in #2703
• Bump docker/build-push-action from 5 to 6 by @dependabot in #2705
• [CI] Enable ARM64 build in CI by @esigo in #2699
• [Code health] Remove Unicode Text from Source files by @perhapsmaple in #2707
• [BUILD] Add option WITH_OTLP_GRPC_SSL_MTLS_PREVIEW by @owent in #2714
• [EXPORTER] All 2xx return codes should be considered successful. by @owent in #2712
• [RELEASE] Release opentelemetry-cpp version 1.16.0 by @marcalff in #2711

Important changes

• [API/SDK] Provider cleanup
  #2664
  • Before this fix:
    • The API class opentelemetry::trace::Tracer exposed methods such
      as ForceFlush(), ForceFlushWithMicroseconds(), Close()
      and CloseWithMicroseconds().
    • These methods are meant to be used when configuring the SDK,
      and should not be part of the API. Exposing them was an oversight.
    • Two of these methods are virtual, and therefore part of the ABI.
  • After this fix:
    • In OPENTELEMETRY_ABI_VERSION_NO 1, nothing is changed,
      because removing this code would break the ABI.
    • In OPENTELEMETRY_ABI_VERSION_NO 2, these methods are moved
      from the API to the SDK. This is a breaking change for ABI version 2,
      which is still experimental.
  • In all cases, instrumenting an application should not
    invoke flush or close on a tracer, do not use these methods.

Breaking changes

• [API/SDK] Provider cleanup
  #2664
  • Before this fix:
    • SDK factory methods such as:
      • opentelemetry::sdk::trace::TracerProviderFactory::Create()
      • opentelemetry::sdk::metrics::MeterProviderFactory::Create()
      • opentelemetry::sdk::logs::LoggerProviderFactory::Create()
      • opentelemetry::sdk::logs::EventLoggerProviderFactory::Create()
        returned an API object (opentelemetry::trace::TracerProvider)
        to the caller.
  • After this fix, these methods return an SDK level object
    (opentelemetry::sdk::trace::TracerProvider) to the caller.
  • Returning an SDK object is necessary for the application to
    cleanup and invoke SDK level methods, such as ForceFlush(),
    on a provider.
  • The application code that configures the SDK, by calling
    the various provider factories, may need adjustment.
  • All the examples have been updated, and in particular no
    longer perform static_cast do convert an API object to an SDK object.
    Please refer to examples for guidance on how to adjust.
  • If adjusting application code is impractical,
    an alternate and temporary solution is to build with option
    WITH_DEPRECATED_SDK_FACTORY=ON in CMake.
  • Option WITH_DEPRECATED_SDK_FACTORY=ON will allow to build code
    without application changes, posponing changes for later.
  • WITH_DEPRECATED_SDK_FACTORY=ON is temporary, only to provide
    an easier migration path. Expect this flag to be removed,
    as early as by the next release.

Notes on experimental features

• #2372
  introduced MeterProvider::SetExemplar() which accepts an
  ExemplarFilterType enumeration with kAlwaysOff, kAlwaysOn and
  kTraceBased.

New Contributors

• @arekay made their first contribution in #2553
• @t-b made their first contribution in #2652
• @LeiZhang-Hunter made their first contribution in #2701

Full Changelog: v1.15.0...v1.16.0

v1.15.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• Reapply "Change OTLP HTTP content_type default to binary (#2558)" by @ThomsonTan in #2564
• [DOC] Fix OTLP documentation: Default endpoint is wrong for OTLP/HTTP by @alanwest in #2560
• [BUILD] Fix old style cast warning by @keith in #2567
• [EXPORTER] Gzip compression support for OTLP/HTTP and OTLP/gRPC exporter by @perhapsmaple in #2530
• [BUILD] update vcpkg submodule to 2024.02.14 by @ThomsonTan in #2575
• [SDK] Support for OTEL_SERVICE_NAME by @willie in #2577
• [EXPORTER] Support URL-encoded values for OTEL_EXPORTER_OTLP_HEADERS by @pyohannes in #2579
• [BUILD] CMake cleanup for message() by @marcalff in #2582
• [BUILD] Bump CMake minimum required version to 3.9 by @marcalff in #2581
• [BUILD] Provide LIKELY / UNLIKELY macros by @marcalff in #2580
• [EXPORTER] OTLP: Fix missing ResourceMetrics SchemaURL by @perhapsmaple in #2587
• [etw] cleanup include path by @ThomsonTan in #2594
• Upgrade to googletest 1.14.0 by @marcalff in #2596
• Upgrade to nlohmann_json 3.11.3 by @marcalff in #2595
• [bazel] Move -std=c++14 to .bazelrc by @keith in #2600
• [bazel] Fix -std=c++14 warning on Windows by @keith in #2601
• Upgrade to benchmark 1.8.3 by @marcalff in #2597
• Upgrade to prometheus 1.2.4 by @marcalff in #2598
• [doc] Fix typo: Asynchronouse -> Asynchronous in meter.h by @yijiem in #2604
• [BUILD] Do not link prometheus-cpp::util when it doesn't exist by @owent in #2606
• [SDK] Remove unused variable by @keith in #2609
• [METRICS SDK] Remove extra OfferMeasurement call in SyncMetricsStorage::OfferMeasurement by @ThomsonTan in #2610
• [MISC] Use set -e on all shell scripts and pass shellcheck --severity=error by @johnbley in #2616
• [CI] Add shellcheck --severity=error as a CI step by @johnbley in #2618
• [CI] Upgrade to abseil 20240116.1 (CMake only) by @marcalff in #2599
• [CI] Benchmark, provide units with --benchmark_min_time by @marcalff in #2621
• [EXPORTER] OTLP file exporter by @owent in #2540
• [CI] Use platform CMake by @marcalff in #2627
• [PROTO] Upgrade to opentelemetry-proto 1.2.0 by @marcalff in #2631
• [SDK] DefaultLogHandler to print errors to std::cerr, add LogLevel::None by @marcalff in #2622
• [SEMANTIC CONVENTIONS] Upgrade to semantic convention 1.25.0 by @esigo in #2633
• [DOC] Add readme and examples for OTLP FILE exporters. by @owent in #2638
• [SEMANTIC CONVENTIONS] Rework on semantic conventions 1.25.0 by @marcalff in #2640
• [DOC] Update INSTALL.md by @chenhong805 in #2592
• [RELEASE] Release opentelemetry-cpp version 1.15.0 by @marcalff in #2639

Important changes:

• [EXPORTER] Gzip compression support for OTLP/HTTP and OTLP/gRPC exporter
  #2530
  • In the OtlpHttpExporterOptions and OtlpGrpcExporterOptions, a new
    field called compression has been introduced. This field can be set
    to "gzip” to enable gzip compression.
  • The CMake option WITH_OTLP_HTTP_COMPRESSION is introduced to enable
    gzip compression support for the OTLP HTTP Exporter and includes a
    dependency on zlib.
• [SDK] Change OTLP HTTP content_type default to binary
  #2558
• [CI] Use platform CMake
  #2627
  • The CI in github no longer install a different version of cmake.
  • It now always use the cmake provided by the platform.
  • As part of this change, the script ci/setup_cmake.sh was renamed
    to ci/setup_googletest.sh, for clarity, now that this script
    only installs googletest.
• [SDK] DefaultLogHandler to print to std::cerr, add LogLevel::None
  #2622
  • Change DefaultLogHandler output
    • Before, the default internal logger, DefaultLogHandler,
      used to print to std::cout.
    • Now, DefaultLogHandler prints errors and warnings to std::cerr,
      as expected, while printing info and debug messages to std::cout.
    • Applications that expected to find the opentelemetry-cpp internal
      error log in std::cout may need adjustments, either by looking
      at std::cerr instead, or by using a custom log handler.
  • Additional LogLevel::None
    • LogLevel::None is a new supported log level, which does not print
      any message.
    • Custom log handlers may need to implement a new case, to avoid
      compiler warnings.
    • Numbering of log levels like OTEL_INTERNAL_LOG_LEVEL_ERROR
      has changed, which requires to rebuild, as the SDK ABI differs.

New Contributors

• @alanwest made their first contribution in #2560
• @keith made their first contribution in #2567
• @willie made their first contribution in #2577
• @yijiem made their first contribution in #2604
• @johnbley made their first contribution in #2616
• @chenhong805 made their first contribution in #2592

Full Changelog: v1.14.2...v1.15.0

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

What's Changed

• [SDK] Fix observable attributes drop #2557

v1.14.1 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [DOC] Fix typo in benchmarks.rst by @orion160 in #2542
• [BUILD] Incorrect test on ENABLE_OTLP_GRPC_SSL_MTLS_PREVIEW by @marcalff in #2546
• [EXPORTER] Error when grpc endpoint is empty by @HennerM in #2507
• [DOC] Add missing 1.14.0 CHANGELOG by @marcalff in #2549
• [SDK] Restore Recordable API compatibility with versions < 1.14.0 by @dbolduc in #2547
• [RELEASE] Release opentelemetry-cpp version 1.14.1 by @marcalff in #2551

Important changes

• [SDK] Restore Recordable API compatibility with versions < 1.14.0
  #2547
  • For third party extending the SDK, release 1.14.0 introduced
    an API breaking change compared to 1.13.0
  • This fix restores API (but not ABI) compatibility of
    release 1.14.1 with release 1.13.0.
  • This allows to build a third party exporter with no source code changes,
    for both releases 1.14.1 and 1.13.0.

New Contributors

• @orion160 made their first contribution in #2542
• @HennerM made their first contribution in #2507

Full Changelog: v1.14.0...v1.14.1

v1.14.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [BUILD] Remove gmock from GTEST_BOTH_LIBRARIES by @ThomsonTan in #2437
• Bump actions/stale from 8 to 9 by @dependabot in #2441
• [BUILD] Accept path list in OPENTELEMETRY_EXTERNAL_COMPONENT_PATH by @ThomsonTan in #2439
• [BUILD] Fix removing of NOMINMAX on Windows by @ThomsonTan in #2449
• [REMOVAL] Remove option WITH_OTLP_HTTP_SSL_PREVIEW by @marcalff in #2435
• Bump github/codeql-action from 2 to 3 by @dependabot in #2452
• [BUILD] Introduce CXX 20 CI pipeline for MSVC/Windows by @ThomsonTan in #2450
• [SEMANTIC CONVENTIONS] Code generation script fails on SELINUX by @marcalff in #2455
• Bump actions/upload-artifact from 3 to 4 by @dependabot in #2456
• [EXPORTER] Add option to disable Prometheus otel_scope_name and otel_scope_version attributes by @timwoj in #2451
• [EXPORTER] Fix Aggregation type detection in OTLP Exporter by @lalitb in #2467
• [EXPORTER] Do not use regex in CleanUpString because some implementations of STL may crash. by @owent in #2464
• [EXPORTER and SDK] Additional fixes after NOMINMAX removal on Windows by @meastp in #2475
• Remove duplicate install command in CMakeLists.txt for api by @meastp in #2474
• [EXPORTER] Set is_monotonic flag for Observable Counters by @samin36 in #2478
• [EXPORTER] Rename populate_otel_scope to without_otel_scope by @timwoj in #2479
• [BUILD] Skip patch alias target by @owent in #2457
• [PROTO] Upgrade to opentelemetry-proto v1.1.0 by @marcalff in #2488
• [EXPORTER] Fix forward protocol encoding for ETW exporter by @ThomsonTan in #2473
• Bump actions/cache from 3 to 4 by @dependabot in #2491
• [EXAMPLES] Use logs API instead of logs bridge API in the example by @ThomsonTan in #2494
• [BUILD] Fix checks on __cplusplus under MSVC, do not assume /Zc by @bcsgh in #2493
• [BUILD] Add DLL build CI pipeline with CXX20 by @ThomsonTan in #2465
• [BUILD] Fix variable shadow by @owent in #2498
• [DOCUMENTATION] Add api reference documentation for logs by @S-Bohn in #2497
• [CI] Make cmake.c++20*.test actualy use C++20 and add cmake.c++23*.test by @bcsgh in #2496
• [BUILD] Alternative way of exporting symbols (generating .def file) by @meastp in #2476
• [BUILD] Fix multiple assignment operators for SpinLockMutex by @SaiHarshaK in #2501
• [BUILD] Clang-15 warning about __has_trivial_destructor by @marcalff in #2502
• [EXAMPLES] Improve readme of Metrics example by @ThomsonTan in #2510
• [SEMANTIC CONVENTIONS] Upgrade to version 1.24.0 by @marcalff in #2461
• [BUILD] Remove unnecessary usage/includes of nostd/type_traits by @bogdandrutu in #2509
• Bump peter-evans/create-or-update-comment from 3.1.0 to 4.0.0 by @dependabot in #2512
• Updated the recorded vcpkg submodule version by @ThomsonTan in #2513
• [API] Propagators: do not overwrite the active span with a default invalid span by @ecourreges-orange in #2511
• [DOC] Fixes CI markdown error MD055 - Table pipe style by @marcalff in #2517
• [BUILD] Better handling of OPENTELEMETRY_STL_VERSION under Bazel. by @bcsgh in #2503
• Bump codecov/codecov-action from 3 to 4 by @dependabot in #2519
• Fix attribute filtering for synchronous instruments. by @lalitb in #2472
• [EXPORTER] Async exporting for otlp grpc by @owent in #2407
• Don't invoke vcpkg from this repo with CMAKE_TOOLCHAIN_FILE set by @ThomsonTan in #2527
• Remove namespace using in ETW exporter which affects global namespace by @ThomsonTan in #2531
• [DOC] Fix calendar link by @marcalff in #2532
• [API] Propagation: fix for hex conversion to binary for odd hex strings by @karusher in #2533
• [RELEASE] opentelemetry-cpp version 1.14.0 by @ThomsonTan in #2537

Breaking Changes:

• [REMOVAL] Remove option WITH_OTLP_HTTP_SSL_PREVIEW
  #2435

  • CMake options WITH_OTLP_HTTP_SSL_PREVIEW and
    WITH_OTLP_HTTP_SSL_TLS_PREVIEW are removed. Building opentelemetry-cpp
    without SSL support is no longer possible.

• [PROTO] Upgrade to opentelemetry-proto v1.1.0
  #2488

  • Class opentelemetry::sdk::trace::Recordable has a new virtual method,
    SetTraceFlags().
  • This is an incompatible change for the SDK Recordable API and ABI.
  • Applications configuring the SDK are not affected.
  • Third parties providing SDK extensions are affected,
    and must provide a SetTraceFlags() implementation,
    starting with opentelemetry-cpp 1.14.0.

New Contributors

• @timwoj made their first contribution in #2451
• @samin36 made their first contribution in #2478
• @bcsgh made their first contribution in #2493
• @S-Bohn made their first contribution in #2497
• @SaiHarshaK made their first contribution in #2501
• @ecourreges-orange made their first contribution in #2511
• @karusher made their first contribution in #2533

Full Changelog: v1.13.0...v1.14.0

v1.13.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [BUILD] Remove WITH_REMOVE_METER_PREVIEW, use WITH_ABI_VERSION_2 instead by @marcalff in #2370
• [SDK] Metrics ObservableRegistry Cleanup by @perhapsmaple in #2376
• [BUILD] Make WITH_OTLP_HTTP_SSL_PREVIEW mainstream by @marcalff in #2378
• [SDK] Creating DoubleUpDownCounter with no matching view by @lalitb in #2379
• [API] Add InstrumentationScope attributes in TracerProvider::GetTracer() by @marcalff in #2371
• Bump peter-evans/create-or-update-comment from 3.0.2 to 3.1.0 by @dependabot in #2381
• [BUILD] DLL export interface for Metrics by @perhapsmaple in #2344
• [BUILD] enum CanonicalCode names too generic... conflict with old C defines by @marcalff in #2385
• [BUILD] Fix cpack broken package version by @jafonso in #2386
• [API] Add a new AddLink() operation to Span by @marcalff in #2380
• [opentracing-shim] Add check for sampled context by @chusitoo in #2390
• [BUILD] Fix exported definitions when building DLL with STL by @perhapsmaple in #2387
• [BUILD] Add missing includes to runtime_context_test by @perhapsmaple in #2395
• [ADMIN] Add file .github/repository-settings.md by @marcalff in #2392
• [SDK] Fix GetLogger with empty library name by @ThomsonTan in #2398
• [TEST] Fix compiling problem and removed -DENABLE_TEST by @owent in #2401
• [BUILD] Check windows options are not passed to non-Windows build by @ThomsonTan in #2399
• [EXPORTER] Rework OTLP/HTTP and OTLP/GRPC exporter options by @marcalff in #2388
• Bump actions/github-script from 6 to 7 by @dependabot in #2403
• [Build] Update vcpkg to latest release by @ThomsonTan in #2412
• [SDK] Cardinality limits for metrics streams (Sync Instruments + Delta Temporality) by @lalitb in #2255
• [EXPORTER] Prometheus: Add unit to names, convert to word by @esigo in #2213
• [Metrics] Make context optional for histogram instruments in Metrics SDK by @ThomsonTan in #2416
• [BUILD] Fix references to trace namespace to be fully qualified by @bogdandrutu in #2422
• [BUILD] Bump third_party/googletest to same version as bazel by @bogdandrutu in #2421
• [BUILD] Remove defining NOMINMAX from api by @ThomsonTan in #2420
• [BUILD] 'uint8_t' not declared in this scope with gcc 13.2.1 by @Thomas-Barbier-1A in #2423
• [BUILD] Improve the handling of OPENTELEMETRY_HAVE_WORKING_REGEX. by @kylepl in #2430
• [SEMANTIC CONVENTIONS] Upgrade to semconv version 1.23.1 by @marcalff in #2428
• [BUILD] Use fully qualified references to trace/common namespace by @bogdandrutu in #2424
• [API] Create root span with active span by @lalitb in #2427
• [REMOVAL] Remove ZPAGES by @marcalff in #2433
• [RELEASE] Prepare release 1.13.0 by @marcalff in #2432

Important changes

• [API] Add InstrumentationScope attributes in TracerProvider::GetTracer()
  #2371

  • TracerProvider::GetTracer() now accepts InstrumentationScope attributes.
  • Because this is an ABI breaking change, the fix is only available
    with the CMake option WITH_ABI_VERSION_2=ON.
  • When building with CMake option WITH_ABI_VERSION_1=ON (by default)
    the ABI is unchanged, and the fix is not available.

• [API] Add a new AddLink() operation to Span
  #2380

  • New API Span::AddLink() adds a single link to a span.
  • New API Span::AddLinks() adds multiple links to a span.
  • Because this is an ABI breaking change, the fix is only available
    with the CMake option WITH_ABI_VERSION_2=ON.
  • When building with CMake option WITH_ABI_VERSION_1=ON (by default)
    the ABI is unchanged, and the fix is not available.

• [BUILD] Make WITH_OTLP_HTTP_SSL_PREVIEW mainstream
  #2378

  • The experimental CMake option WITH_OTLP_HTTP_SSL_PREVIEW
    is now promoted to stable. The default is changed to ON.
  • The experimental CMake option WITH_OTLP_HTTP_SSL_TLS_PREVIEW
    is now promoted to stable. The default is changed to ON.
  • These build options are scheduled to be removed by the next release,
    building without SSL/TLS will no longer be possible.

• [EXPORTER] Rework OTLP/HTTP and OTLP/GRPC exporter options
  #2388

  • OtlpGrpcMetricExporterOptions used to honor _TRACES_
    environment variables, instead of _METRICS_ environment variables.
  • The implementation of OtlpGrpcMetricExporterOptions is now fixed.
  • Please check configuration variables,
    to make sure _METRICS_ variables are set as expected.

Breaking changes

• [BUILD] Remove WITH_REMOVE_METER_PREVIEW, use WITH_ABI_VERSION_2 instead
  #2370

  • The experimental CMake option WITH_REMOVE_METER_PREVIEW is removed,
    use option WITH_ABI_VERSION_2 instead.

• [BUILD] enum CanonicalCode names too generic... conflict with old C defines
  #2385

  • Header file opentelemetry/trace/canonical_code.h is unused,
    and is now removed.
  • This header should not be included directly in an application.
    If this is the case, please remove any remaining include directives.

• [BUILD] Fix exported definitions when building DLL with STL
  #2387

  • The MeterSelector, MeterSelectorFactory, InstrumentSelector,
    and InstrumentSelectorFactory APIs now use const std::string&
    instead of nostd::string_view for name, version and schema to
    maintain a single export definition for DLL.

• [EXPORTER] Rework OTLP/HTTP and OTLP/GRPC exporter options
  #2388

  • OtlpGrpcLogRecordExporter incorrectly used OtlpGrpcExporterOptions,
    which are options for traces and not logs.
  • This created a bug: the OtlpGrpcLogRecordExporter honors _TRACES_
    environment variables, instead of _LOGS_ environment variables.
  • OtlpGrpcLogRecordExporter is changed to use
    OtlpGrpcLogRecordExporterOptions instead, fixing the bug.
  • User code that initializes the SDK with a GRPC Log exporter,
    and uses exporter options, should adjust to replace
    OtlpGrpcExporterOptions with OtlpGrpcLogRecordExporterOptions.
  • Please check configuration variables,
    to make sure _LOGS_ variables are set as expected.

• [REMOVAL] Remove ZPAGES
  #2433

  • As announced in release 1.12.0,
    the deprecated ZPAGES exporter is now removed.

New Contributors

• @perhapsmaple made their first contribution in #2376
• @jafonso made their first contribution in #2386
• @Thomas-Barbier-1A made their first contribution in #2423

Full Changelog: v1.12.0...v1.13.0

v1.12.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [BUILD] Support pkg-config by @dbolduc in #2269
• [CI] Do not automatically close stale issues by @marcalff in #2277
• [CI] Benchmark workflow fails, C++14 required to build grpc by @marcalff in #2278
• [SDK] Increase metric name maximum length from 63 to 255 characters by @marcalff in #2284
• [SEMANTIC CONVENTION] Deprecated semconv (in the spec) not deprecated (in C++) by @marcalff in #2285
• [SDK] Remove unused member variables from SyncMetricStorage by @lalitb in #2294
• Bump actions/checkout from 3 to 4 by @dependabot in #2295
• [DEPRECATION] Deprecate ZPAGES by @marcalff in #2291
• Bump docker/setup-qemu-action from 2 to 3 by @dependabot in #2306
• Bump docker/build-push-action from 4 to 5 by @dependabot in #2308
• Bump docker/setup-buildx-action from 2 to 3 by @dependabot in #2307
• [API] Deliver ABI breaking changes by @marcalff in #2222
• [SDK] Allow metric instrument names to contain / characters by @marcalff in #2310
• Bump codecov/codecov-action from 3 to 4 by @dependabot in #2314
• Revert "Bump codecov/codecov-action from 3 to 4" by @marcalff in #2315
• [SDK] Fix Observable Counters/UpDownCounters by @lalitb in #2298
• [SDK] Add exemplar reservoir to async metric storage by @ThomsonTan in #2319
• [TEST] Fix lifetime issues in prometheus test utils by @punya in #2322
• [EXPORTER] Prometheus: Remove explicit timestamps from metric points by @punya in #2324
• [EXPORTER] Prometheus: Handle attribute key collisions from sanitation by @punya in #2326
• [EXPORTER] Prometheus cleanup, test with TranslateToPrometheus by @punya in #2329
• [SDK] Fix log message in Meter::RegisterSyncMetricStorage by @ThomsonTan in #2325
• [DOC] Simplify the project status section by @reyang in #2332
• [EXPORTER] Prometheus: Sanitize labels according to spec by @punya in #2330
• [SDK] Fix deadlock when shuting down http client by @owent in #2337
• [Exporter] Group spans by resource and instrumentation scope in OTLP export requests by @mbrobbel in #2335
• [BUILD] Need fine-grained HAVE_CPP_STDLIB by @marcalff in #2304
• [API] Add InstrumentationScope attributes in MeterProvider::GetMeter() by @marcalff in #2224
• [REMOVAL] Drop C++11 support by @marcalff in #2342
• [EXPORTER] prometheus: add otel_scope_name and otel_scope_version labels by @dashpole in #2293
• [EXPORTER] Export resource for prometheus by @owent in #2301
• [BUILD] error: read-only reference ‘value’ used as ‘asm’ output by @marcalff in #2354
• [BUILD] Build break with external CMake nlohman_json package by @marcalff in #2353
• [BUILD] Upgrade libcurl to version 8.4.0 by @marcalff in #2358
• [BUILD] Fix opentracing-shim when added in super project by @andremarianiello in #2356
• [BUILD] Fix protoc searching with non-imported protobuf::protoc target by @owent in #2362
• [BUILD] Support to use different cmake package CONFIG of dependencies. by @owent in #2263
• [SEMANTIC CONVENTION] Upgrade to semconv 1.22.0 by @marcalff in #2368
• [RELEASE] Prepare release 1.12.0 by @marcalff in #2359

Important changes

• [API] Add InstrumentationScope attributes in MeterProvider::GetMeter()
  #2224
  • MeterProvider::GetMeter() now accepts InstrumentationScope attributes.
  • Because this is an ABI breaking change, the fix is only available
    with the CMake option WITH_ABI_VERSION_2=ON.
  • When building with CMake option WITH_ABI_VERSION_1=ON (by default)
    the ABI is unchanged, and the fix is not available.

Breaking changes

• [BUILD] Need fine-grained HAVE_CPP_STDLIB
  #2304

  • In CMAKE, the boolean option WITH_STL as changed to an option
    that accepts the values OFF, ON, CXX11, CXX14, CXX17,
    CXX20 and CXX23.
  • Applications makefiles that did not set WITH_STL need to use
    WITH_STL=OFF instead (this is the default).
  • Applications makefiles that did set WITH_STL need to use
    WITH_STL=ON instead, or may choose to pick a specific value.
  • In the API header files, the preprocessor symbol HAVE_CPP_STDLIB
    is no longer used.
  • Applications that did set HAVE_CPP_STDLIB before, need to set
    OPENTELEMETRY_STL_VERSION=<version> instead, to build with a
    specific STL version (2011, 2014, 2017, 2020, 2023).
  • The opentelemetry-cpp makefile no longer sets
    CMAKE_CXX_STANDARD by itself.
    Instead, the CMAKE_CXX_STANDARD and/or compiler options -stdc++ used
    by the caller are honored.
  • Applications that set neither CMAKE_CXX_STANDARD nor -stdc++
    options may need to provide a C++ standard in their makefiles.

• [REMOVAL] Drop C++11 support
  #2342

  • Building with C++11 is no longer supported.

New Contributors

• @punya made their first contribution in #2322
• @dashpole made their first contribution in #2293
• @andremarianiello made their first contribution in #2356

Full Changelog: v1.11.0...v1.12.0

v1.11.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

What's Changed

• [BUILD] include by @dbolduc in #2230
• [CI] Upgrade GoogleTest version from 1.12.1 to 1.13.0 by @cngzhnp in #2114
• [CI] Misc build scripts cleanup by @marcalff in #2232
• Add support for LowMemory metrics temporality by @lalitb in #2234
• Add OStreamLogRecordExporterFactory by @owent in #2240
• [Metrics SDK] Add unit to Instrument selection criteria by @lalitb in #2236
• Fix compile with clang 16 and libc++ by @owent in #2242
• [SDK] Valgrind errors on std::atomic variables by @marcalff in #2244
• [SEMANTIC CONVENTIONS] Upgrade to 1.21.0 by @marcalff in #2248
• Mark logs signal as stable API/SDK by @ThomsonTan in #2229
• Remove extra includes in ostream exporter test by @lalitb in #2252
• Support protobuf 3.22 or upper by @owent in #2163
• Apparent Log Macro Bug Fix by @jaelrod in #2265
• use ubuntu-latest for tsan CI by @lalitb in #2267
• added public link of opentelemetry_proto_grpc against [shared] gRPC lib by @ays7 in #2268
• Fix more cases for symbol name for 32-bit win32 DLL build by @TomSvk88 in #2264

Notes

• Logs are declared as stable in this release.

New Contributors

• @TomSvk88 made their first contribution in #2264

Full Changelog: v1.10.0...v1.11.0

v1.10.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-prometheus

REMOVAL

• [REMOVAL] Remove the jaeger exporter
  #2031

CI

• [CI] Add a C++11 build
  #2152

• [CI] Add Include what you use
  #2214

• [CI] opentelemetry-cpp project CI
  #2071

• [CI] Do not tag pull_request with the "need-triage" label
  #2228

BUILD

• [BUILD] Fixing CMake to build GTest on Windows
  #1887

• [BUILD] Remove option WITH_OTLP
  #2161

• [BUILD] Link to opentelemetry_logs even without OTLP
  #2177

• [BUILD] Avoid dependency on protobuf from the OTLP HTTP metrics exporter header
  #2179

• [BUILD] Add ctime header to metrics_exporter.cc
  #2187

• [BUILD] Fix the exported symbol name for 32-bit win32 DLL
  #2190

• [BUILD] Upgrade to opentelemetry-proto 0.20.0
  #2195

• [BUILD] SDK Header files cleanup, use forward declarations
  #2182

• [BUILD] Enable building otel-cpp extensions from main repo
  #1937

• [BUILD] Fix if check on environment variable and add CMake variable
  #2207

• [BUILD] Add OPENTELEMETRY_CPP_FOUND into cmake CONFIG file
  #2215

• [BUILD] Upgrade opentelemetry-proto to 1.0.0
  #2216

• [BUILD] Include nostd/string_view which is used in severity.h
  #2219

TEST

• [TEST] Expand api singleton test to cover explicit dlopen()
  #2164

API

• [API] Remove include_trace_context
  #2194

• [API] Remove Meters
  #2205

SDK

• [SDK] Add AdaptingCircularBufferCounter for exponential histograms
  #2158

• [SDK] Add base2 exponential histogram indexer
  #2173

• [SDK] Simplify SDK version
  #2180

• [SDK] Add benchmark for base2 exponential histogram indexer
  #2181

• [SDK] Provide builders to avoid exposing Metrics SDK internals
  #2189

• [SDK] MeterProvider should own MeterContext, not share it
  #2218

• [SDK] TracerProvider should own TracerContext, not share it
  #2221

EXPORTER

• [EXPORTER] Change OTLP Json field name to camelCase
  #2162

• [EXPORTER] Support empty arrays in OtlpRecordable attributes
  #2166

• [EXPORTER] set is_monotonic only for instrument type kCounter
  #2171

• [EXPORTER] Fixed HTTP CURL for 32bits platforms
  #2178

• [EXPORTER] Fix OTLP HTTP exporting in sync mode
  #2193

• [EXPORTER] Prometheus exporter sanitizes invalid characters
  #1934

• [EXPORTER] Prometheus: Error on ingesting samples
  with different value but same timestamp
  #2200

• [EXPORTER] OTLP GRPC mTLS support
  #2120

DOC

• [DOC] Small fix for Histogram documentation
  #2156

• [DOC] Move Reiley Yang to emeritus
  #2198

Important changes

• [API] Remove Meters
  #2205
  • The CMake option WITH_REMOVE_METER_PREVIEW was added.
  • This option is experimental, and may change in the future.
  • Enabling it is an ABI breaking change.

Breaking changes

• [REMOVAL] Remove the jaeger exporter
  #2031

  • The CMake WITH_JAEGER option has been removed
  • Please remove usage of WITH_JAEGER from user scripts and makefiles.

• [SDK] MeterProvider should own MeterContext, not share it
  #2218

  • The MeterProvider constructor now takes a unique_ptr on
    MeterContext, instead of a shared_ptr.
  • Please adjust SDK configuration code accordingly.

• [SDK] TracerProvider should own TracerContext, not share it
  #2221

  • The TracerProvider constructor now takes a unique_ptr on
    TracerContext, instead of a shared_ptr.
  • The LoggerProvider constructor now takes a unique_ptr on
    LoggerContext, instead of a shared_ptr.
  • Please adjust SDK configuration code accordingly.

All Deprecations

• C++11 support is to end, C++14 will be supported instead,
  see DEPRECATED for details.

New Contributors

• @bachittle made their first contribution in #1887
• @mbrobbel made their first contribution in #2166
• @euroelessar made their first contribution in #2158
• @jaelrod made their first contribution in #2171
• @kylepl made their first contribution in #2120

Full Changelog: v1.9.1...v1.10.0