OpenTelemetry C++

The C++ OpenTelemetry client.

Project Status

Signal	Status	Project
Traces	Public Release	N/A
Metrics	Development [1]	N/A
Logs	Experimental [2]	N/A

• [1]: The development of the metrics API and SDK based on new stable specification is ongoing. The timelines would be available in release milestone. The earlier implementation (based on old specification) can be included in build by setting ENABLE_METRICS_PREVIEW preprocessor macro, and is included under */_metrics/* directory. This would be eventually removed once the ongoing implemetation is stable.
• [2]: The current Log Signal Implementation is Experimental, and will change as the current OpenTelemetry Log specification matures. The current implementation can be included in build by setting ENABLE_LOGS_PREVIEW preprocessor macro.

OpenTelemetry Specification Compatibility Matrix

API Version	Core Version	Contrib Version
1.0.0	1.0.0-rc4	N/A [1]
1.0.0	1.0.0	N/A

• [1]: We don't have releases for opentelemetry-cpp contrib repo. This may change in future.

Supported C++ Versions

Code shipped from this repository generally supports the following versions of C++ standards:

• ISO/IEC 14882:2011 (C++11, C++0x)
• ISO/IEC 14882:2014 (C++14, C++1y)
• ISO/IEC 14882:2017 (C++17, C++1z)
• ISO/IEC 14882:2020 (C++20)

Any exceptions to this are noted in the individual README.md files.

Please note that supporting the C Programming Language is not a goal of the current project.

Supported Development Platforms

Our CI pipeline builds and tests on following x86-64 platforms:

Platform	Build type
ubuntu-20.04 (Default GCC Compiler - 9.3.0)	CMake, Bazel
ubuntu-18.04 (GCC 4.8 with -std=c++11 flag)	CMake [1]
ubuntu-20.04 (Default GCC Compiler - 9.3.0 with -std=c++20 flags)	CMake, Bazel
macOS 10.15 (Xcode 12.2)	Bazel
Windows Server 2019 (Visual Studio Enterprise 2019)	CMake, Bazel

[1]: Bazel build is disabled for GCC 4.8, as gRPC library 1.38 and above (required by OTLP expoter) don't build with this compiler. See gRPC official support document. CMake build doesn't build OTLP exporter with GCC 4.8.

In general, the code shipped from this repository should build on all platforms having C++ compiler with supported C++ standards.

Dependencies

Please refer to Dependencies.md for OSS Dependencies and license requirements.

Installation

Please refer to INSTALL.md.

Getting Started

As an application owner or the library author, you can find the getting started guide and reference documentation on opentelemetry-cpp.readthedocs.io

The examples/simple directory contains a minimal program demonstrating how to instrument a small library using a simple processor and console exporter, along with build files for CMake and Bazel.

Contributing

See CONTRIBUTING.md

We meet weekly, and the time of the meeting alternates between Monday at 13:00 PT and Wednesday at 10:00 PT. The meeting is subject to change depending on contributors' availability. Check the OpenTelemetry community calendar for specific dates and Zoom meeting links.

Meeting notes are available as a public Google doc. For edit access, get in touch on Slack.

Maintainers (@open-telemetry/cpp-maintainers):

• Ehsan Saei
• Lalit Kumar Bhasin, Microsoft
• Tom Tan, Microsoft

Approvers (@open-telemetry/cpp-approvers):

• Josh Suereth, Google
• Reiley Yang, Microsoft

Emeritus Maintainer/Approver/Triager:

• Alolita Sharma
• Emil Mikulic
• Jodee Varney
• Johannes Tax
• Max Golovanov
• Ryan Burn

Thanks to all the people who have contributed

Release Schedule

Refer to project status for current status of the project.

See the release notes for existing releases.

See the project milestones for details on upcoming releases. The dates and features described in issues and milestones are estimates, and subject to change.