Versioning

This document describes the versioning policy for this repository. This policy is designed so the following goals can be achieved.

Goals

API Stability

Once the API for a given signal (spans, logs, metrics, baggage) has been officially released, that API module will function with any SDK that has the same major version, and equal or greater minor or patch version.

For example, libraries that are instrumented with opentelemetry 1.0.1 will function in applications using opentelemetry 1.11.33 or opentelemetry 1.3.4.

SDK Stability

Public portions of the SDK (constructors, configuration, end-user interfaces) must remain backwards compatible. Internal types are allowed to break.

Policy

Releases will follow SemVer.
New telemetry signals will be introduced behind experimental cargo features.
- New signals will be stabilized via a minor version bump, and are not allowed to break existing stable interfaces.
GitHub releases will be made for all released versions.
Crates will be released on crates.io

Example Versioning Lifecycle

To better understand the implementation of the above policy, here is an example of how the metrics and logging signals could stabilize.

v1.0.0 release:
- opentelemetry 1.0.0
  - Contains stable impls of trace, baggage, resource, context modules
  - experimental metrics impl behind feature flag
- opentelemetry-semantic-conventions 1.0.0
  - Contains stable impls of trace, resource conventions
  - experimental metrics conventions behind feature flag
- opentelemetry-contrib 1.0.0
  - Contains stable impls of 3rd party trace exporters and propagators
  - experimental metrics exporters and propagator impls behind feature flag
v1.5.0 release (with metrics)
- opentelemetry 1.5.0
  - Contains stable impls of metrics, trace, baggage, resource, context modules
  - experimental logging impl still only behind feature flag
- opentelemetry-semantic-conventions 1.2.0
  - Contains stable impls of metrics, trace, resource conventions
  - experimental logging conventions still only behind feature flag
- opentelemetry-contrib 1.6.0
  - Contains stable impls of 3rd party trace and metrics exporters and propagators
  - experimental logging exporters and propagator still impls behind feature flag
v1.10.0 release (with logging)
- opentelemetry 1.10.0
  - Contains stable impls of logging, metrics, trace, baggage, resource, context modules
- opentelemetry-semantic-conventions 1.4.0
  - Contains stable impls of logging, metrics, trace, resource conventions
- opentelemetry-contrib 1.12.0
  - Contains stable impls of 3rd party trace, metrics, and logging exporters and propagators

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