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218 lines
10 KiB
Markdown
218 lines
10 KiB
Markdown
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# Versioning
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This document describes the versioning policy for this repository. This policy
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is designed so the following goals can be achieved.
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**Users are provided a codebase of value that is stable and secure.**
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## Policy
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* Versioning of this project will be idiomatic of a Go project using [Go
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modules](https://github.com/golang/go/wiki/Modules).
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* [Semantic import
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versioning](https://github.com/golang/go/wiki/Modules#semantic-import-versioning)
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will be used.
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* Versions will comply with [semver 2.0](https://semver.org/spec/v2.0.0.html).
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* If a module is version `v2` or higher, the major version of the module
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must be included as a `/vN` at the end of the module paths used in
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`go.mod` files (e.g., `module go.opentelemetry.io/otel/v2`, `require
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go.opentelemetry.io/otel/v2 v2.0.1`) and in the package import path
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(e.g., `import "go.opentelemetry.io/otel/v2/trace"`). This includes the
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paths used in `go get` commands (e.g., `go get
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go.opentelemetry.io/otel/v2@v2.0.1`. Note there is both a `/v2` and a
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`@v2.0.1` in that example. One way to think about it is that the module
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name now includes the `/v2`, so include `/v2` whenever you are using the
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module name).
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* If a module is version `v0` or `v1`, do not include the major version in
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either the module path or the import path.
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* Modules will be used to encapsulate signals and components.
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* Experimental modules still under active development will be versioned at
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`v0` to imply the stability guarantee defined by
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[semver](https://semver.org/spec/v2.0.0.html#spec-item-4).
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> Major version zero (0.y.z) is for initial development. Anything MAY
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> change at any time. The public API SHOULD NOT be considered stable.
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* Mature modules for which we guarantee a stable public API will be versioned
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with a major version greater than `v0`.
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* The decision to make a module stable will be made on a case-by-case
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basis by the maintainers of this project.
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* Experimental modules will start their versioning at `v0.0.0` and will
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increment their minor version when backwards incompatible changes are
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released and increment their patch version when backwards compatible
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changes are released.
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* All stable modules that use the same major version number will use the
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same entire version number.
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* Stable modules may be released with an incremented minor or patch
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version even though that module has not been changed, but rather so
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that it will remain at the same version as other stable modules that
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did undergo change.
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* When an experimental module becomes stable a new stable module version
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will be released and will include this now stable module. The new
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stable module version will be an increment of the minor version number
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and will be applied to all existing stable modules as well as the newly
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stable module being released.
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* Versioning of the associated [contrib
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repository](https://github.com/open-telemetry/opentelemetry-go-contrib) of
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this project will be idiomatic of a Go project using [Go
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modules](https://github.com/golang/go/wiki/Modules).
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* [Semantic import
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versioning](https://github.com/golang/go/wiki/Modules#semantic-import-versioning)
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will be used.
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* Versions will comply with [semver 2.0](https://semver.org/spec/v2.0.0.html).
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* If a module is version `v2` or higher, the
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major version of the module must be included as a `/vN` at the end of the
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module paths used in `go.mod` files (e.g., `module
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go.opentelemetry.io/contrib/instrumentation/host/v2`, `require
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go.opentelemetry.io/contrib/instrumentation/host/v2 v2.0.1`) and in the
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package import path (e.g., `import
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"go.opentelemetry.io/contrib/instrumentation/host/v2"`). This includes
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the paths used in `go get` commands (e.g., `go get
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go.opentelemetry.io/contrib/instrumentation/host/v2@v2.0.1`. Note there
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is both a `/v2` and a `@v2.0.1` in that example. One way to think about
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it is that the module name now includes the `/v2`, so include `/v2`
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whenever you are using the module name).
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* If a module is version `v0` or `v1`, do not include the major version
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in either the module path or the import path.
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* In addition to public APIs, telemetry produced by stable instrumentation
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will remain stable and backwards compatible. This is to avoid breaking
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alerts and dashboard.
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* Modules will be used to encapsulate instrumentation, detectors, exporters,
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propagators, and any other independent sets of related components.
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* Experimental modules still under active development will be versioned at
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`v0` to imply the stability guarantee defined by
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[semver](https://semver.org/spec/v2.0.0.html#spec-item-4).
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> Major version zero (0.y.z) is for initial development. Anything MAY
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> change at any time. The public API SHOULD NOT be considered stable.
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* Mature modules for which we guarantee a stable public API and telemetry will
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be versioned with a major version greater than `v0`.
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* Experimental modules will start their versioning at `v0.0.0` and will
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increment their minor version when backwards incompatible changes are
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released and increment their patch version when backwards compatible
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changes are released.
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* Stable contrib modules cannot depend on experimental modules from this
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project.
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* All stable contrib modules of the same major version with this project
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will use the same entire version as this project.
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* Stable modules may be released with an incremented minor or patch
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version even though that module's code has not been changed. Instead
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the only change that will have been included is to have updated that
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modules dependency on this project's stable APIs.
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* When an experimental module in contrib becomes stable a new stable
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module version will be released and will include this now stable
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module. The new stable module version will be an increment of the minor
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version number and will be applied to all existing stable contrib
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modules, this project's modules, and the newly stable module being
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released.
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* Contrib modules will be kept up to date with this project's releases.
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* Due to the dependency contrib modules will implicitly have on this
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project's modules the release of stable contrib modules to match the
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released version number will be staggered after this project's release.
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There is no explicit time guarantee for how long after this projects
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release the contrib release will be. Effort should be made to keep them
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as close in time as possible.
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* No additional stable release in this project can be made until the
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contrib repository has a matching stable release.
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* No release can be made in the contrib repository after this project's
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stable release except for a stable release of the contrib repository.
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* GitHub releases will be made for all releases.
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* Go modules will be made available at Go package mirrors.
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## Example Versioning Lifecycle
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To better understand the implementation of the above policy the following
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example is provided. This project is simplified to include only the following
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modules and their versions:
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* `otel`: `v0.14.0`
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* `otel/trace`: `v0.14.0`
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* `otel/metric`: `v0.14.0`
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* `otel/baggage`: `v0.14.0`
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* `otel/sdk/trace`: `v0.14.0`
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* `otel/sdk/metric`: `v0.14.0`
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These modules have been developed to a point where the `otel/trace`,
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`otel/baggage`, and `otel/sdk/trace` modules have reached a point that they
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should be considered for a stable release. The `otel/metric` and
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`otel/sdk/metric` are still under active development and the `otel` module
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depends on both `otel/trace` and `otel/metric`.
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The `otel` package is refactored to remove its dependencies on `otel/metric` so
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it can be released as stable as well. With that done the following release
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candidates are made:
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* `otel`: `v1.0.0-rc.1`
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* `otel/trace`: `v1.0.0-rc.1`
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* `otel/baggage`: `v1.0.0-rc.1`
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* `otel/sdk/trace`: `v1.0.0-rc.1`
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The `otel/metric` and `otel/sdk/metric` modules remain at `v0.14.0`.
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A few minor issues are discovered in the `otel/trace` package. These issues are
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resolved with some minor, but backwards incompatible, changes and are released
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as a second release candidate:
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* `otel`: `v1.0.0-rc.2`
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* `otel/trace`: `v1.0.0-rc.2`
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* `otel/baggage`: `v1.0.0-rc.2`
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* `otel/sdk/trace`: `v1.0.0-rc.2`
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Notice that all module version numbers are incremented to adhere to our
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versioning policy.
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After these release candidates have been evaluated to satisfaction, they are
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released as version `v1.0.0`.
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* `otel`: `v1.0.0`
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* `otel/trace`: `v1.0.0`
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* `otel/baggage`: `v1.0.0`
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* `otel/sdk/trace`: `v1.0.0`
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Since both the `go` utility and the Go module system support [the semantic
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versioning definition of
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precedence](https://semver.org/spec/v2.0.0.html#spec-item-11), this release
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will correctly be interpreted as the successor to the previous release
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candidates.
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Active development of this project continues. The `otel/metric` module now has
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backwards incompatible changes to its API that need to be released and the
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`otel/baggage` module has a minor bug fix that needs to be released. The
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following release is made:
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* `otel`: `v1.0.1`
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* `otel/trace`: `v1.0.1`
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* `otel/metric`: `v0.15.0`
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* `otel/baggage`: `v1.0.1`
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* `otel/sdk/trace`: `v1.0.1`
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* `otel/sdk/metric`: `v0.15.0`
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Notice that, again, all stable module versions are incremented in unison and
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the `otel/sdk/metric` package, which depends on the `otel/metric` package, also
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bumped its version. This bump of the `otel/sdk/metric` package makes sense
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given their coupling, though it is not explicitly required by our versioning
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policy.
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As we progress, the `otel/metric` and `otel/sdk/metric` packages have reached a
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point where they should be evaluated for stability. The `otel` module is
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reintegrated with the `otel/metric` package and the following release is made:
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* `otel`: `v1.1.0-rc.1`
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* `otel/trace`: `v1.1.0-rc.1`
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* `otel/metric`: `v1.1.0-rc.1`
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* `otel/baggage`: `v1.1.0-rc.1`
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* `otel/sdk/trace`: `v1.1.0-rc.1`
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* `otel/sdk/metric`: `v1.1.0-rc.1`
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All the modules are evaluated and determined to a viable stable release. They
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are then released as version `v1.1.0` (the minor version is incremented to
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indicate the addition of new signal).
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* `otel`: `v1.1.0`
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* `otel/trace`: `v1.1.0`
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* `otel/metric`: `v1.1.0`
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* `otel/baggage`: `v1.1.0`
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* `otel/sdk/trace`: `v1.1.0`
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* `otel/sdk/metric`: `v1.1.0`
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