How to streamline interactions between multiple repositories with multi-project pipelines

Modern software products often consist of multiple components and microservices, necessitating the use of multi-project pipelines to manage interactions between different repositories. GitLab 9.3 introduced these pipelines, allowing users to trigger external pipelines from a job using the $CI_JOB_TOKEN variable and the Pipeline Trigger API, without needing additional authentication. This token is limited in scope and is destroyed after the job ends to prevent misuse. Users can easily view related pipelines through the pipeline graph or mini-graph in the Merge Request Widget, which shows upstream and downstream connections. Multi-project pipelines are beneficial for automating tasks like testing changes across connected components or triggering downstream pipelines for software packaging and release. An example application demonstrates how a Maven package and a command-line app interact via multi-project pipelines to maintain updates. GitLab aims to further develop these features based on user feedback to enhance automation and integration across large applications.

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