# Release Process

There are two types of release for the `go.opentelemetry.io/contrib` repo
and submodules.

1. **Case 1** A release due to changes independent of the
`go.opentelemetry.io/otel` module, e.g. perhaps a critical bug fix in
one of the contrib modules.

2. **Case 2** A release due to a breaking API change in
`go.opentelemetry.io/otel` which all modules in this repo
depend on.

## Pre-Release

Update go.mod for submodules to depend on the upcoming new release of
the module in this repo, `go.opentelemetry.io/contrib`.  Decide on the
next version of the semantic tag to apply to the contrib
module based on whether you fall into Case 1 or Case 2.

### Case 1

If the changes are all internal to this repo, then the new tag will
most often be a patch or minor version upgrade to the existing tag on
this module. Let's call this `<new_contrib_tag>`.

### Case 2

If a new release is required due to breaking changes in
`go.opentelemetry.io/otel`, then the new semantic tag for this repo
should be bumped to match the `go.opentelemetry.io/otel` new tag.
Let's call this `<new_otel_tag>`. The script checks that
`go.opentelemetry.io/otel@v<new_otel_tag>` is a valid tag, so you need
to wait until that tag has been pushed in the main repo.

In nearly all cases, `<new_contrib_tag>` should be the same as
`<new_otel_tag>`.

1. Run `pre_release.sh` script to create a branch `pre_release_<new_contrib_tag>`.
   The script will also run `go mod tidy` and `make ci`.

   * **Case 1** `./pre_release.sh -t <new_contrib_tag>`
   * **Case 2** `./pre_release.sh -o <new_otel_tag> [-t <new_contrib_tag>]`

2. If you used `-o <new_otel_tag>` to rewrite the modules to depend on
   a new version of `go.opentelemetry.io/otel`, there will likely be
   breaking changes that require fixes to the files in this
   `contrib` repo.  Make the appropriate fixes to address any API
   breaks and run through the

        ```
        git commit -m "fixes due to API changes"
        make precommit
        ```

   cycle until everything passes

4. Push the changes to upstream.

    ```
    git diff main
    git push
    ```

5. Create a PR on github and merge the PR once approved.


### Tag
Now create a `<new_contrib_tag>` on the commit hash of the changes made in pre-release step,

1. Run the tag.sh script.

    ```
    ./tag.sh <new_contrib_tag> <commit-hash>
    ```
2. Push tags upstream. Make sure you push upstream for all the sub-module tags as well.

    ```
    git push upstream <new_contrib_tag>
    git push upstream <submodules-path/new_contrib_tag>
    ...
    ```

## Release
Now create a release for the new `<new_contrib_tag>` on github.
The release body should include all the release notes in the Changelog for this release.
Additionally, the `tag.sh` script generates commit logs since last release which can be used to suppliment the release notes.

<!-- ## Verify Examples -->
<!-- After releasing run following script to verify that examples build outside of the otel repo. -->
<!-- The script copies examples into a different directory and builds them. -->

<!-- ``` -->
<!-- ./verify_examples.sh -->
<!-- ``` -->