OpenTelemetry C++ v1.8.0

v1.8.0 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

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

API

• No API change

SDK

• Fix GlobalLogHandler singleton creation order by @lalitb in #1767

Exporter

• [ETW Exporter] Fix span timestamp(s) precision to nanoseconds by @lalitb in #1726
• [Prometheus Exporter] add fix for prometheus exporter build by @rochaudhari in #1795
• Fix session lock of OtlpHttpClient by @owent in #1760
• Add status code to OTLP grpc trace log by @ThomsonTan in #1792

Build

• Multiple CURL packages leads to invalid build (#1738) by @marcalff in #1739
• Bring your own dependency: opentelemetry-proto by @marcalff in #1730
• bump to gRPC v1.48.1 for bazel CIs by @esigo in #1786
• Fix clang-format in CI by @marcalff in #1796
• Fix CI build by @marcalff in #1798
• Fix CI benchmark by @marcalff in #1799
• Add option WITH_BENCHMARK to disable building benchmarks by @ThomsonTan in #1794
• Upgrade bazel build to use abseil-cpp-20220623.1 by @marcalff in #1779
• Fix benchmark CI by @esigo in #1808
• Bump abseil-cpp for cmake CI by @esigo in #1807

Metrics

• Remove old metric from GitHub CI by @lalitb in #1733
• Cleanup of old _metric api/sdk by @esigo in #1734
• Cleanup ENABLE_METRICS_PREVIEW by @esigo in #1735
• Change Prometheus CMake target name by @lalitb in #1765
• Add MeterContext::ForEachMeter() method to process callbacks on Meter in thread-safe manner by @lalitb in #1783

Logs

• LogProcessor, LogExporter changes by @owent in #1727
• LogProcessor, LogExporter class name by @esigo in #1736

Sementic Convention

• [SEMANTIC CONVENTIONS] Upgrade to version 1.15.0 by @marcalff in #1761
• [Deprecation] Deprecate experimental semantic conventions (#1742) by @marcalff in #1744

Documentation

• Update Metrics status in README.md by @lalitb in #1722
• Remove misleading comments about ABI compatibility for nostd::span by @marcalff in #1731
• Cleanup ENABLE_METRICS_PREVIEW by @marcalff in #1745
• Format config options in OTLP exporter readme by @ThomsonTan in #1748
• Cleanup INSTALL.md by @ThomsonTan in #1757
• Document that clang-format version 10.0 is used. by @marcalff in #1782

New Contributors

• @rochaudhari made their first contribution in #1795

Full Changelog: v1.7.0...v1.8.0

Notes:

Deprecation notes:

• [Deprecation] Deprecate experimental semantic conventions
  #1744

  • The file
    api/include/opentelemetry/trace/experimental_semantic_conventions.h
    is deprecated, and will be removed in a future release.
    Use file
    api/include/opentelemetry/trace/semantic_conventions.h
    instead.

  • The file
    sdk/include/opentelemetry/sdk/resource/experimental_semantic_conventions.h
    is deprecated, and will be removed in a future release.
    Use file
    sdk/include/opentelemetry/sdk/resource/semantic_conventions.h
    instead.

  • The function, declared in the global namespace
    uint32_t hashCode(const char *str, uint32_t h = 0)
    is deprecated, and will be removed in a future release.
    No replacement will be provided.
    Note that function opentelemetry::utils::hashCode,
    declared in the ETW exporter, is not affected by this deprecation.

Breaking changes:

• [SEMANTIC CONVENTIONS] Upgrade to version 1.15.0
  #1761
  • Naming of semantic conventions has changed from uppercase constants,
    like SemanticConventions::SERVICE_NAME,
    to camel case, like SemanticConventions::kServiceName.
    This is necessary to avoid collisions with macros in general,
    which breaks the build on some platforms.
  • Semantic conventions are flagged as experimental,
    which is why this change is done in this release.
• [METRICS] Old metrics implementation including API, SDK and Exporters removed.