Dependencies and Licenses

There are

External dependencies as linkable libraries or externally installed headers, and
Internal dependencies as the part of code from external libraries backported/copied in main repo.

Both these dependencies are listed here:

Internal dependencies

nostd::variant: This is backported from Abseil C++ libraries and used as default variant implementation. License: Apache License 2.0
TraceLoggingDynamic: Dynamic TraceLogging Provider API for C++ used by ETW exporter. License: MIT License

External dependencies

API & SDK:
- Uses Standard C++ library for latest features (std::string_view, std::variant, std::span, std::shared_ptr, std::unique_ptr) with C++14/17/20 compiler if cmake option WITH_STL is enabled or macro OPENTELEMETRY_STL_VERSION is defined. License: GNU General Public License
  - For C++14/17 compilers, fallback to gsl::span if GSL C++ library is installed. License: MIT License
  - libc++ 14.0.0 do not support construct std::span from a range or container .We don't use the std::span in this situation.Users can also define OPENTELEMETRY_OPTION_USE_STD_SPAN=0 to indicate nostd:span will always not be a alias for std::span.
OTLP/HTTP+JSON exporter:
- protobuf: Library to serialize structured data.
  - OTLP messages are constructed as protobuf payloads.
  - protoc compiler is used to generate C++ stubs for proto files provided by opentelemetry-proto.
  - libprotobuf library is used for generating serialized trace/metrics/log data to be sent to opentelemetry collector.
  - License: The library is licensed here. The code generated by protoc compiler is owned by the owner of .proto file.
- libcurl : the multiprotocol file transfer library.
  - Export connects with opentelemetry collector over HTTP protocol using libcurl library
  - License: Inspired by MIT/X but not same. https://curl.se/docs/copyright.html
- nlohmann/json: JSON for Modern C++.
  - protobuf serialized otlp messages are encoded in JSON format using this library.
  - License: MIT License
- zlib: A Massively Spiffy Yet Delicately Unobtrusive Compression Library.
  - The http_client utilizes zlib to compress the message body and send it in gzip format.
  - License: The library is licensed here
OTLP/gRPC exporter:
- protobuf OTLP messages are constructed as protobuf payloads.
- gRPC: An RPC library and framework
  - Exporter communicates with OTLP collector using gRPC transport mechanism.
  - License: Apache License 2.0
Zipkin exporter:
- libcurl for connecting with Zipkin server over HTTP protocol.
- nlohmann/json for encoding Zipkin messages.
ETW exporter:
- nlohmann/json for generating MessagePack serialization for message to be transmitted to ETW.
Prometheus exporter:
- prometheus-cpp Prometheus Client Library for Modern C++
  - License: MIT License
ElasticSearch exporter:
- libcurl for connecting with Elasticsearch server over HTTP protocol.
- nlohmann/json for encoding Elastic Search messages.
Opentracing shim:
- opentracing-cpp OpenTracing API for C++
  - A bridge layer implementing the OpenTracing API using the OpenTelemetry API
  - License: Apache License 2.0

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