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Add pipeline graph

Description

When looking at a pipeline, we currently render its builds as a list. This is fine for some use cases, but inadequate for others. We should render builds in a graph showing their sequential and parallel natures. A good solution would not take up an inordinate amount of vertical space and would add value by helping a user visualize the pipeline flow, and quickly identify problems in pipeline runs.

Proposal

Pipeline:

Add a pipeline graph above the existing build list. Show both. Possibly let the user collapse the pipeline graph if it's too large.

Todo

  • Collapsing parallel builds of similar name is not handled today. Ideally, we'd leverage automatically parallelized tests (#3819 (closed)), but we could define a convention for naming, such as job-name {index} {total} and interpret that as a collapsable, parallel job.

Links / references