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diff --git a/doc/ci/merge_request_pipelines/pipelines_for_merged_results/merge_trains/index.md b/doc/ci/merge_request_pipelines/pipelines_for_merged_results/merge_trains/index.md index b6706c2a272..641192afea1 100644 --- a/doc/ci/merge_request_pipelines/pipelines_for_merged_results/merge_trains/index.md +++ b/doc/ci/merge_request_pipelines/pipelines_for_merged_results/merge_trains/index.md @@ -168,6 +168,27 @@ A Merge Train pipeline cannot be retried because the merge request is dropped fr In the case of pipeline failure, you should [re-enqueue](#add-a-merge-request-to-a-merge-train) the merge request to the merge train, which will then initiate a new pipeline. +### Unable to add to merge train with message "The pipeline for this merge request failed." + +Sometimes the **Start/Add to Merge Train** button is not available and the merge request says, +"The pipeline for this merge request failed. Please retry the job or push a new commit to fix the failure." + +This issue occurs when [**Pipelines must succeed**](../../../../user/project/merge_requests/merge_when_pipeline_succeeds.md#only-allow-merge-requests-to-be-merged-if-the-pipeline-succeeds) +is enabled in **Settings > General > Merge requests**. This option requires that you +run a new successful pipeline before you can re-add a merge request to a merge train. + +Merge trains ensure that each pipeline has succeeded before a merge happens, so +you can clear the **Pipelines must succeed** check box and keep +**Merge pipelines will try to validate the post-merge result prior to merging** (merge trains) enabled. + +If you want to keep the **Pipelines must succeed** option enabled along with Merge +Trains, you can create a new pipeline for merged results when this error occurs by +going to the **Pipelines** tab and clicking **Run pipeline**. Then click +**Start/Add to merge train when pipeline succeeds**. + +See [the related issue](https://gitlab.com/gitlab-org/gitlab/issues/35135) +for more information. + ### Merge Trains feature flag **(PREMIUM ONLY)** To enable and disable the Merge Trains feature, use the `:disable_merge_trains` feature flag. |