Merge branch 'patch-73' into 'master'

Update GitLab version for duplicating dashboards

See merge request gitlab-org/gitlab!25366

doc/user/project/integrations/prometheus.md

@@ -198,18 +198,23 @@ supported and will not be available in the UI.
 
 #### Duplicating a GitLab-defined dashboard
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/37238) in GitLab 12.7.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/37238) in GitLab 12.7.
+> - From [GitLab 12.8 onwards](https://gitlab.com/gitlab-org/gitlab/issues/39505), custom metrics are also duplicated when you duplicate a dashboard.
 
-You can save a copy of a GitLab defined dashboard that can be customized and adapted to your project. You can decide to save the dashboard new `.yml` file in the project's **default** branch or in a newly created branch with a name of your choosing.
+You can save a complete copy of a GitLab defined dashboard along with all custom metrics added to it.
+Resulting `.yml` file can be customized and adapted to your project.
+You can decide to save the dashboard `.yml` file in the project's **default** branch or in a
+new branch.
 
-1. Click on the "Duplicate dashboard" in the dashboard dropdown.
+1. Click **Duplicate dashboard** in the dashboard dropdown.
 
    NOTE: **Note:**
-   Only GitLab-defined dashboards can be duplicated.
+   You can duplicate only GitLab-defined dashboards.
 
-1. Input the file name and other information, such as a new commit message, and click on "Duplicate".
+1. Enter the file name and other information, such as the new commit's message, and click **Duplicate**.
 
-If you select your **default** branch, the new dashboard will become immediately available. If you select another branch, this branch should be merged to your **default** branch first.
+If you select your **default** branch, the new dashboard becomes immediately available.
+If you select another branch, this branch should be merged to your **default** branch first.
 
 #### Dashboard YAML properties