What are GitLab Flow best practices?

Using feature branches is a simple way to develop and keep the source code clean. If a team has recently transitioned to Git from SVN, for example, they'll be used to a trunk-based workflow. When using Git, developers should create a branch for anything they're working on so that contributors can easily start the code review process before merging.

Some developers set up their CI to only test what has been merged into the main branch, but this is too late in the software development lifecyle, and everyone - from developers to product managers - should feel feel confident that the main branch always has green tests. It's inefficient for developers to have to test main before they start developing new features.

When working on a feature branch and adding new commits, run tests right away. If the tests are taking a long time, try running them in parallel. Do this server-side in merge requests, running the complete test suite. If there is a test suite for development and another only for new versions, it's worthwhile to set up [parallel] tests and run them all.

Don't test everything at the end of a week or project. Code reviews should take place as soon as possible, because developers are more likely to identify issues that could cause problems later in the lifecycle. Since they'll find problems earlier, they'll have an easier time creating solutions.

If developers don't want to deploy main every time, they can create a production branch. Rather than using a script or doing it manually, teams can use automation or have a specific branch that triggers a production deploy.

Developers should use tags so that the CI will perform an action rather than having the CI change the repository. If teams require detailed metrics, they should have a server report detailing new versions.

Each tag should create a new release. This practice ensures a clean, efficient development environment.

When pushing to a public branch, developers shouldn't rebase it, because that makes it difficult to identify the improvement and test results, while cherry picking. Sometimes this tip can be ignored when asking someone to squash and rebase at the end of a code review process to make something easier to revert. However, in general, the guideline is: Code should be clean, and history should be realistic.

This tip prevents long branches. Developers check out main, build a feature, create a merge request, and target main again. They should do a complete review before merging and eliminating any intermediate stages.

After identifying a bug, a problematic action someone could take is fix it in the just-released version and not fix it in main. To avoid it, developers should always fix forward by pushing the change in main, then cherry-pick it into another patch-release branch.

Developers should not only say what they did, but also why they did it. An even more useful tactic is to explain why this option was selected over others to help future contributors understand the development process. Writing descriptive commit messages is useful for code reviews and future development.