How to avoid broken master with Pipelines for Merged Results and Merge Trains

In GitLab, managing continuous integration (CI) pipelines is crucial to maintaining stable source code and preventing broken master branches, which can undermine trust and block deployment streams. The text discusses two critical GitLab features, Pipelines for Merged Results and Merge Trains, designed to address issues related to outdated source branches and concurrent merges. Pipelines for Merged Results ensure that CI pipelines run on merge commits rather than outdated feature branches, thereby validating the merge requests against the latest master branch before actual merging. This approach helps developers avoid the tedious task of continually rebasing their merge requests. Meanwhile, Merge Trains act as a queuing system to handle multiple simultaneous merges, ensuring that pipelines are tested sequentially and issues are detected before they can disrupt the master branch. These tools not only enhance the reliability of the CI process but also maintain development speed by allowing optimistic assumptions about the sequence of merges. The features empower maintainers and developers with greater confidence in code quality and stability, encouraging them to adopt advanced CI/CD practices.

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