# Changelog entries This guide contains instructions for when and how to generate a changelog entry file, as well as information and history about our changelog process. ## Overview Each bullet point, or **entry**, in our [`CHANGELOG.md`][changelog.md] file is generated from a single data file in the [`changelogs/unreleased/`][unreleased] (or corresponding EE) folder. The file is expected to be a [YAML] file in the following format: ```yaml --- title: "Change[log]s" merge_request: 1972 author: Black Sabbath type: added ``` The `merge_request` value is a reference to a merge request that adds this entry, and the `author` key is used to give attribution to community contributors. **Both are optional**. The `type` field maps the category of the change, valid options are: added, fixed, changed, deprecated, removed, security, performance, other. **Type field is mandatory**. Community contributors and core team members are encouraged to add their name to the `author` field. GitLab team members **should not**. [changelog.md]: https://gitlab.com/gitlab-org/gitlab/blob/master/CHANGELOG.md [unreleased]: https://gitlab.com/gitlab-org/gitlab-foss/tree/master/changelogs/ [YAML]: https://en.wikipedia.org/wiki/YAML ## What warrants a changelog entry? - Any change that introduces a database migration **must** have a changelog entry. - Any user-facing change **should** have a changelog entry. Example: "GitLab now uses system fonts for all text." - Performance improvements **should** have a changelog entry. - _Any_ contribution from a community member, no matter how small, **may** have a changelog entry regardless of these guidelines if the contributor wants one. Example: "Fixed a typo on the search results page." - Any docs-only changes **should not** have a changelog entry. - Any change behind a feature flag **should not** have a changelog entry. The entry should be added [in the merge request removing the feature flags](feature_flags/development.md). - A fix for a regression introduced and then fixed in the same release (i.e., fixing a bug introduced during a monthly release candidate) **should not** have a changelog entry. - Any developer-facing change (e.g., refactoring, technical debt remediation, test suite changes) **should not** have a changelog entry. Example: "Reduce database records created during Cycle Analytics model spec." ## Writing good changelog entries A good changelog entry should be descriptive and concise. It should explain the change to a reader who has _zero context_ about the change. If you have trouble making it both concise and descriptive, err on the side of descriptive. - **Bad:** Go to a project order. - **Good:** Show a user's starred projects at the top of the "Go to project" dropdown. The first example provides no context of where the change was made, or why, or how it benefits the user. - **Bad:** Copy (some text) to clipboard. - **Good:** Update the "Copy to clipboard" tooltip to indicate what's being copied. Again, the first example is too vague and provides no context. - **Bad:** Fixes and Improves CSS and HTML problems in mini pipeline graph and builds dropdown. - **Good:** Fix tooltips and hover states in mini pipeline graph and builds dropdown. The first example is too focused on implementation details. The user doesn't care that we changed CSS and HTML, they care about the _end result_ of those changes. - **Bad:** Strip out `nil`s in the Array of Commit objects returned from `find_commits_by_message_with_elastic` - **Good:** Fix 500 errors caused by elasticsearch results referencing garbage-collected commits The first example focuses on _how_ we fixed something, not on _what_ it fixes. The rewritten version clearly describes the _end benefit_ to the user (fewer 500 errors), and _when_ (searching commits with Elasticsearch). Use your best judgement and try to put yourself in the mindset of someone reading the compiled changelog. Does this entry add value? Does it offer context about _where_ and _why_ the change was made? ## How to generate a changelog entry A `bin/changelog` script is available to generate the changelog entry file automatically. Its simplest usage is to provide the value for `title`: ```text bin/changelog 'Hey DZ, I added a feature to GitLab!' ``` If you want to generate a changelog entry for GitLab EE, you will need to pass the `--ee` option: ```text bin/changelog --ee 'Hey DZ, I added a feature to GitLab!' ``` At this point the script would ask you to select the category of the change (mapped to the `type` field in the entry): ```text >> Please specify the category of your change: 1. New feature 2. Bug fix 3. Feature change 4. New deprecation 5. Feature removal 6. Security fix 7. Performance improvement 8. Other ``` The entry filename is based on the name of the current Git branch. If you run the command above on a branch called `feature/hey-dz`, it will generate a `changelogs/unreleased/feature-hey-dz.yml` file. The command will output the path of the generated file and its contents: ```text create changelogs/unreleased/my-feature.yml --- title: Hey DZ, I added a feature to GitLab! merge_request: author: type: ``` ### Arguments | Argument | Shorthand | Purpose | | ----------------- | --------- | --------------------------------------------------------------------------------------------------------------------------------------- | | [`--amend`](#--amend) | | Amend the previous commit | | [`--force`](#--force-or--f) | `-f` | Overwrite an existing entry | | [`--merge-request`](#--merge-request-or--m) | `-m` | Set merge request ID | | [`--dry-run`](#--dry-run-or--n) | `-n` | Don't actually write anything, just print | | [`--git-username`](#--git-username-or--u) | `-u` | Use Git user.name configuration as the author | | [`--type`](#--type-or--t) | `-t` | The category of the change, valid options are: `added`, `fixed`, `changed`, `deprecated`, `removed`, `security`, `performance`, `other` | | `--help` | `-h` | Print help message | #### `--amend` You can pass the **`--amend`** argument to automatically stage the generated file and amend it to the previous commit. If you use **`--amend`** and don't provide a title, it will automatically use the "subject" of the previous commit, which is the first line of the commit message: ```text $ git show --oneline ab88683 Added an awesome new feature to GitLab $ bin/changelog --amend create changelogs/unreleased/feature-hey-dz.yml --- title: Added an awesome new feature to GitLab merge_request: author: type: ``` #### `--force` or `-f` Use **`--force`** or **`-f`** to overwrite an existing changelog entry if it already exists. ```text $ bin/changelog 'Hey DZ, I added a feature to GitLab!' error changelogs/unreleased/feature-hey-dz.yml already exists! Use `--force` to overwrite. $ bin/changelog 'Hey DZ, I added a feature to GitLab!' --force create changelogs/unreleased/feature-hey-dz.yml --- title: Hey DZ, I added a feature to GitLab! merge_request: 1983 author: type: ``` #### `--merge-request` or `-m` Use the **`--merge-request`** or **`-m`** argument to provide the `merge_request` value: ```text $ bin/changelog 'Hey DZ, I added a feature to GitLab!' -m 1983 create changelogs/unreleased/feature-hey-dz.yml --- title: Hey DZ, I added a feature to GitLab! merge_request: 1983 author: type: ``` #### `--dry-run` or `-n` Use the **`--dry-run`** or **`-n`** argument to prevent actually writing or committing anything: ```text $ bin/changelog --amend --dry-run create changelogs/unreleased/feature-hey-dz.yml --- title: Added an awesome new feature to GitLab merge_request: author: type: $ ls changelogs/unreleased/ ``` #### `--git-username` or `-u` Use the **`--git-username`** or **`-u`** argument to automatically fill in the `author` value with your configured Git `user.name` value: ```text $ git config user.name Jane Doe $ bin/changelog -u 'Hey DZ, I added a feature to GitLab!' create changelogs/unreleased/feature-hey-dz.yml --- title: Hey DZ, I added a feature to GitLab! merge_request: author: Jane Doe type: ``` #### `--type` or `-t` Use the **`--type`** or **`-t`** argument to provide the `type` value: ```text $ bin/changelog 'Hey DZ, I added a feature to GitLab!' -t added create changelogs/unreleased/feature-hey-dz.yml --- title: Hey DZ, I added a feature to GitLab! merge_request: author: type: added ``` ### History and Reasoning Our `CHANGELOG` file was previously updated manually by each contributor that felt their change warranted an entry. When two merge requests added their own entries at the same spot in the list, it created a merge conflict in one as soon as the other was merged. When we had dozens of merge requests fighting for the same changelog entry location, this quickly became a major source of merge conflicts and delays in development. This led us to a [boring solution] of "add your entry in a random location in the list." This actually worked pretty well as we got further along in each monthly release cycle, but at the start of a new cycle, when a new version section was added and there were fewer places to "randomly" add an entry, the conflicts became a problem again until we had a sufficient number of entries. On top of all this, it created an entirely different headache for [release managers] when they cherry-picked a commit into a stable branch for a patch release. If the commit included an entry in the `CHANGELOG`, it would include the entire changelog for the latest version in `master`, so the release manager would have to manually remove the later entries. They often would have had to do this multiple times per patch release. This was compounded when we had to release multiple patches at once due to a security issue. We needed to automate all of this manual work. So we [started brainstorming]. After much discussion we settled on the current solution of one file per entry, and then compiling the entries into the overall `CHANGELOG.md` file during the [release process]. [boring solution]: https://about.gitlab.com/handbook/values/#boring-solutions [release managers]: https://gitlab.com/gitlab-org/release/docs/blob/master/quickstart/release-manager.md [started brainstorming]: https://gitlab.com/gitlab-org/gitlab-foss/issues/17826 [release process]: https://gitlab.com/gitlab-org/release-tools --- [Return to Development documentation](README.md)