Document CI_MERGE_REQUEST_EVENT_TYPE for merge request pipelines

This commit adds a documentation for the variable Apply suggestion to doc/ci/variables/predefined_variables.md

Document CI_MERGE_REQUEST_EVENT_TYPE for merge request pipelines
This commit adds a documentation for the variable Apply suggestion to doc/ci/variables/predefined_variables.md
c4f58744 · Shinya Maeda · 9e6edfd3 · c4f58744
Commit c4f58744 authored Dec 20, 2019 by Shinya Maeda
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doc/ci/variables/predefined_variables.md doc/ci/variables/predefined_variables.md +1 -0

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--- a/doc/ci/variables/predefined_variables.md
+++ b/doc/ci/variables/predefined_variables.md
@@ -79,6 +79,7 @@ future GitLab releases.**
 | `CI_MERGE_REQUEST_TARGET_BRANCH_NAME`         | 11.6   | all    | The target branch name of the merge request if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Available only if `only: [merge_requests]` is used and the merge request is created.                                                                                                                                           |
 | `CI_MERGE_REQUEST_TARGET_BRANCH_SHA`          | 11.9   | all    | The HEAD SHA of the target branch of the merge request if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Available only if `only: [merge_requests]` is used, the merge request is created, and the pipeline is a [merged result pipeline](../merge_request_pipelines/pipelines_for_merged_results/index.md). **(PREMIUM)**   |
 | `CI_MERGE_REQUEST_TITLE`                      | 11.9   | all    | The title of the merge request if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Available only if `only: [merge_requests]` is used and the merge request is created.                                                                                                                                                        |
+| `CI_MERGE_REQUEST_EVENT_TYPE`                 | 12.3   | all    | The event type of the merge request, if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Can be `detached`, `merged_result` or `merge_train`. |
 | `CI_NODE_INDEX`                               | 11.5   | all    | Index of the job in the job set. If the job is not parallelized, this variable is not set.                                                                                                                                                                                                                                                                 |
 | `CI_NODE_TOTAL`                               | 11.5   | all    | Total number of instances of this job running in parallel. If the job is not parallelized, this variable is set to `1`.                                                                                                                                                                                                                                    |
 | `CI_PAGES_DOMAIN`                             | 11.8   | all    | The configured domain that hosts GitLab Pages.                                                                                                                                                                                                                                                                                                             |