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# 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](https://github.com/open-telemetry/opentelemetry-cpp/blob/v1.0.0-rc1/api/include/opentelemetry/nostd/absl/types/variant.h):
This is backported from [Abseil C++
libraries](https://github.com/abseil/abseil-cpp) and used as default variant
implementation. License: `Apache License 2.0`
- [TraceLoggingDynamic](https://github.com/open-telemetry/opentelemetry-cpp/blob/v1.0.0-rc1/exporters/etw/include/opentelemetry/exporters/etw/TraceLoggingDynamic.h):
Dynamic TraceLogging Provider API for C++ used by ETW exporter. License: `MIT
License`
## External dependencies
- [API](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/api)
&
[SDK](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/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 `WITH_STL` cmake option is enabled or `HAVE_CPP_STDLIB` macro is
defined. License: `GNU General Public License`
- For C++11/14/17 compilers, fallback to gsl::span if [GSL C++
library](https://github.com/microsoft/GSL) is installed. License: `MIT
License`
- Uses Abseil C++ Library for `absl::variant` as default `nostd::variant` if
`WITH_ABSEIL` cmake option or
`--@io_opentelemetry_cpp/api:with_abseil=true` (aka
`--//api:with_abseil=true`) bazel option is enabled. License: `Apache
License 2.0`
- [OTLP/HTTP+JSON](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/otlp)
exporter:
- [protobuf](https://github.com/protocolbuffers/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 serialised trace/metrics/log
data to be sent to opentelemetry collector.
- License: The library is licensed
[here](https://github.com/protocolbuffers/protobuf/blob/master/LICENSE).
The code generated by protoc compiler is owned by the owner of `.proto`
file.
- [libcurl](https://curl.se/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](https://github.com/nlohmann/json): JSON for Modern C++.
- protobuf serialized otlp messages are encoded in JSON format using this
library.
- License: `MIT License`
- [OTLP/gRPC](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/otlp)
exporter:
- `protobuf` OTLP messages are constructed as protobuf payloads.
- [gRPC](https://github.com/grpc/grpc): An RPC library and framework
- Exporter communicates with OTLP collector using gRPC transport mechanism.
- License: `Apache License 2.0`
- [Zipkin](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/zipkin)
exporter:
- `libcurl` for connecting with Zipkin server over HTTP protocol.
- `nlohmann/json` for encoding Zipkin messages.
- [Jaeger](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/jaeger)
exporter:
- [Thrift](https://github.com/apache/thrift) - Serialization and RPC
framework.
- `thrift` compiler to generate C++ stubs for IDL data model for Jaeger.
- `libthrift` library to generate serialised trace/metrics/log data to be
sent to remote Jaeger service.
- License: `Apache License 2.0`
- [ETW](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/etw)
exporter:
- `nlohmann/json` for generating MessagePack serialization for message to be
transmitted to ETW.
- [Prometheus](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/prometheus)
exporter:
- [`prometheus-cpp`](https://github.com/jupp0r/prometheus-cpp) Prometheus
Client Library for Modern C++
- License: `MIT License`
- [ElasticSearch](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/elasticsearch)
exporter:
- `libcurl` for connecting with Elasticsearch server over HTTP protocol.
- `nlohmann/json` for encoding Elastic Search messages.
- [Zpages](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/ext/src/zpages):
- None
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