OpenTelemetry API vs SDK

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I'm confused as why OpenTelemetry documentaion has OpenTelemetry Python API and OpenTelemetry Python SDK.
Like when using the specification in python when we should consider pip install opentelemetry-api over pip install opentelemetry-sdk

open-telemetry python-3.x python
1 Answers

From the github pages of the implementation.

(note: could not fit this into a comment and did not want to just post a link alone)

This repository includes multiple installable packages. The opentelemetry-api package includes abstract classes and no-op implementations that comprise the OpenTelemetry API following the OpenTelemetry specification. The opentelemetry-sdk package is the reference implementation of the API.

Libraries that produce telemetry data should only depend on opentelemetry-api, and defer the choice of the SDK to the application developer. Applications may depend on opentelemetry-sdk or another package that implements the API.

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