Multiple upstream merge requests for multi-project pipelines

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Problem to solve

Multi-project pipelines allow me to verify that my changes don't break the downstream application, but when multiple components need to be changed together in coordination, I want to be able to verify that in combination they work together.

For example, I have changes to gitaly, gitlab-shell, and gitlab-workhorse that combined implement a new behavior in gitlab-ce. Having specified the relationship between the merge requests using a feature like https://gitlab.com/gitlab-org/gitlab-ee/issues/9688, I want to be able to configure GitLab CI to create a downstream pipeline that integrates all three feature branches.

Intended users

Developers

Further details

Proposal

When multiple cross merge requests are related to each other through a mechanism like https://gitlab.com/gitlab-org/gitlab-ee/issues/9688, offer a method for combining identical downstream pipelines

graph LR;

  subgraph "Current Mulit-project Pipeline";
    A[gitaly] --> C["gitlab-ce"];
    B[gitlab-shell] --> D["gitlab-ce"];
  end;

  subgraph "Proposed Multi-project Pipeline";
    X[gitaly] --> Z["gitlab-ce"];
    Y[gitlab-shell] --> Z["gitlab-ce"];
  end;

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