Gitlab now (since ~2weeks ago?) has a dag view for pipelines. You can go to $pipe/dag (eg https://gitlab.com/coq/coq/-/pipelines/158099478/dag) or go to the pipe's page and click the dag button to see.
See also https://gitlab.com/gitlab-org/gitlab/-/issues/220368
(Click on jobs and tubes to change highlights)
It's pretty useless AFAICT but may be entertaining.
Last updated: Oct 21 2021 at 19:03 UTC